Intelligent transport systems — Traffic and travel information messages via traffic message coding — Part 3: Location referencing for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

This document specifies location referencing rules to address the specific requirements of Traffic Message Channel (TMC) systems, which use abbreviated coding formats to provide traffic and travel information (TTI) messages over mobile bearers (e.g. GMS, DAB) or via exchange protocols like DATEX II. In particular, the rules address the Radio Data System-Traffic Message Channel (RDS-TMC), a means of providing digitally-coded TTI to travellers using a silent data channel on FM radio stations, based on the ALERT-C protocol.

Systèmes de transport intelligents — Informations sur le trafic et les déplacements via le codage de messages sur le trafic — Partie 3: Références de localisants pour le système de radiodiffusion de données - canal de messages d'informations sur le trafic (RDS-TMC) avec Alert-C

Le présent document spécifie les règles de référence de localisant pour couvrir les exigences spécifiques des systèmes TMC (Traffic Message Channel - Canal de messages d'informations sur le trafic), qui utilisent des formats de codage abrégés pour fournir des messages d'informations sur le trafic et les déplacements (TTI) en utilisant des supports mobiles (par exemple: GSM, DAB) ou des protocoles d’échange tels que DATEX II. Ces règles traitent notamment du système de radiodiffusion de données - Canal de messages d’informations sur le trafic (RDS-TMC) qui est un moyen de fournir des messages TTI codées numériquement à des usagers en utilisant un canal de données silencieux diffusé par des stations de radiodiffusion en FM, sur la base du protocole ALERT-C.

General Information

Status
Published
Publication Date
07-Feb-2021
Current Stage
6060 - International Standard published
Start Date
08-Feb-2021
Completion Date
08-Feb-2021
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INTERNATIONAL ISO
STANDARD 14819-3
Third edition
2021-02
Intelligent transport systems — Traffic
and travel information messages via
traffic message coding —
Part 3:
Location referencing for Radio Data
System-Traffic Message Channel (RDS-
TMC) using ALERT-C
Systèmes de transport intelligents — Informations sur le trafic et le
tourisme via le codage de messages sur le trafic —
Partie 3: Références de localisants pour le système de radiodiffusion
de données (RDS) — Canal de messages d'informations sur le trafic
(RDS-TMC) avec ALERT-C
Reference number
ISO 14819-3:2021(E)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 14819-3:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

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on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 14819-3:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms, definitions and abbreviated terms ................................................................................................................................ 1

4 Location coding ...................................................................................................................................................................................................... 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Location tables ........................................................................................................................................................................................ 2

4.2.1 General...................................................................................................................................................................................... 2

4.2.2 Versions and versioning of location tables ................................................................................................ 3

4.2.3 Exchanging location tables ...................................................................................................................................... 3

4.2.4 Hierarchical structure ................................................................................................................................................. 3

4.2.5 Location types .................................................................................................................................................................... 4

4.2.6 Offsets ........................................................................................................................................................................................ 5

4.2.7 Direction of the road ..................................................................................................................................................... 5

4.2.8 Country codes and location table numbers .............................................................................................. 5

4.2.9 Constraints ............................................................................................................................................................................ 6

4.3 TMC location categories, types and subtypes .............................................................................................................. 6

4.4 Location table content ...................................................................................................................................................................... 6

4.4.1 General...................................................................................................................................................................................... 6

4.4.2 Nominal record content ............................................................................................................................................. 6

4.4.3 Road descriptions ........................................................................................................................................................11

4.4.4 Names .....................................................................................................................................................................................12

4.4.5 Upward references ......................................................................................................................................................12

4.4.6 Offsets .....................................................................................................................................................................................12

4.4.7 Urban ......................................................................................................................................................................................12

4.4.8 Intersection reference ..............................................................................................................................................12

4.4.9 WGS84 co-ordinates ..................................................................................................................................................13

4.4.10 InterruptsRoad ...............................................................................................................................................................13

4.5 Detailed junction referencing ..................................................................................................................................................14

4.5.1 Conventional junctions ............................................................................................................................................14

4.5.2 Complex junctions .......................................................................................................................................................14

4.5.3 Detailed coding of link roads ..............................................................................................................................14

4.6 Detailed situation locations ......................................................................................................................................................14

4.6.1 Introduction ......................................................................................................................................................................14

4.6.2 Normal location referencing ...............................................................................................................................14

4.6.3 Detailed location referencing .............................................................................................................................15

4.6.4 Precise location referencing ................................................................................................................................15

4.7 One- and two-way locations .....................................................................................................................................................15

4.7.1 Basic principles ..............................................................................................................................................................15

4.7.2 Junctions ..............................................................................................................................................................................15

4.7.3 Locations with only an exit or entry and locations occurring on one side only.....15

4.7.4 DiversionPos/DiversionNeg ...............................................................................................................................17

Annex A (normative) TMC location categories, types and subtypes ................................................................................18

Annex B (informative) Location table identification ........................................................................................................................26

Annex C (normative) Detailed methods for the usage of location tables ....................................................................32

Annex D (informative) Background information .................................................................................................................................67

Bibliography .............................................................................................................................................................................................................................69

© ISO 2021 – All rights reserved iii
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ISO 14819-3:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems, in

collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/

TC 278, Intelligent transport systems, in accordance with the Agreement on technical cooperation

between ISO and CEN (Vienna Agreement).

This third edition cancels and replaces the second edition (ISO 14819-3:2013), which has been

technically revised.
The main changes compared to the previous edition are as follows:
The following TISA specifications were integrated:
— Location Table Exchange Format 24.
— Reuse-of-location-codes.
— Roads-and-Junction-number-translation.
— Coding of isolated areas.
— Language identifiers.
— Backward compatibility.
— Coding of name translations and languages in TMC tables.
— DLR methods for locations in TMC Location.
A list of all parts in the ISO 14819 series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved
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ISO 14819-3:2021(E)
Introduction

This document primarily addresses the needs of RDS-TMC ALERT-C messages which are in widespread

worldwide use. The modular approach used here is intended to facilitate future extension of the location

referencing rules to other traffic and travel messaging systems.

This document sets out ways of specifying places and positions in traffic and travel information

messages, including RDS-TMC messages (the Radio Data System-Traffic Message Channel).

It defines the structure and semantics of location tables for Traffic Information Centres (TICs) and

receivers.
a) Traffic and travel messages:

1) Traffic and travel information is created and updated in an originating database, by human

operators or automated systems. Information is transferred to one or more remote systems by

means of messages.

2) In this context, a message is a collection of data which is exchanged to convey information for an

agreed purpose between two or more parties. Traffic and travel messages are digitally-coded

sets of data exchanged by interested parties, which convey information about traffic, travel

and/or transport networks. Digital coding may be alphanumeric, as in EDIFACT, or binary, as in

RDS-TMC.

3) The traffic and travel messages developed in programmes of the European Union are open,

non-proprietary proposals for standards intended to serve the public interest by facilitating

interconnection and interoperability of the relevant information systems.
b) Location referencing.

Location references provide the means of saying where in traffic and travel messages.

The location referencing component of a traffic and travel message enables a service provider to indicate

the physical location of the event being described. The management of TMC location databases requires

on-going maintenance. It is necessary to both manage location database ID allocation for countries

implementing TMC services and to validate new and updated location databases when ground features

change. These activities are led by service providers who also need to ensure that their end-users

are kept up-to-date. The Traveller Information Services Association (www .tisa .org) manages the ID

allocation on a worldwide basis. TISA provides location database validation for service providers who

generally arrange location database updates on a bi-annual cycle. This certification procedure extends

the basic rules mentioned in this standard and also applies a best-practice validation. TISA grants a

stamp of quality to those location tables that pass a set of tests.
© ISO 2021 – All rights reserved v
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INTERNATIONAL STANDARD ISO 14819-3:2021(E)
Intelligent transport systems — Traffic and travel
information messages via traffic message coding —
Part 3:
Location referencing for Radio Data System-Traffic
Message Channel (RDS-TMC) using ALERT-C
1 Scope

This document specifies location referencing rules to address the specific requirements of Traffic

Message Channel (TMC) systems, which use abbreviated coding formats to provide traffic and travel

information (TTI) messages over mobile bearers (e.g. GMS, DAB) or via exchange protocols like DATEX

II. In particular, the rules address the Radio Data System-Traffic Message Channel (RDS-TMC), a means

of providing digitally-coded TTI to travellers using a silent data channel on FM radio stations, based on

the ALERT-C protocol.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 639-1, Codes for the representation of names of languages — Part 1: Alpha-2 code

ISO 14819-1, Intelligent transport systems — Traffic and travel information messages via traffic message

coding — Part 1: Coding protocol for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

ISO 15924, Information and documentation — Codes for the representation of names of scripts

3 Terms, definitions and abbreviated terms
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
For the purposes of this document, the following abbreviated terms apply:
ALERT-C Advice and Problem Location for European Road Traffic, Version C
ASCII American Standard Code for Information Interchange
CCD country code
CID country identifier
CLST code of location subtype
CNAME country name
ECC extended country code
EDIFACT Electronic data interchange for administration commerce and transport
© ISO 2021 – All rights reserved 1
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ISO 14819-3:2021(E)

GDF geographic data files (for modelling and exchange of geographic data for transport

telematics applications)
LC location code
LTCC location table country code
LTN location table number
POI point of interest
RDS radio data system (digital information channel on FM sub carrier)
TIC traffic information centre
TISA Traveller Information Services Association
TMC traffic message channel
TTI traffic and travel information
WGS84 World Geodetic System 1984
4 Location coding
4.1 General

Location references used by RDS-TMC are covered by the location referencing rules defined in this

subclause. The ALERT-C coding protocol for RDS-TMC is defined in ISO 14819-1.

ALERT-C supports a digital, silent data broadcast service for motorists, providing information about

many kinds of traffic situations. This includes roadwork, weather and traffic incident information

relating to major national and international roads, regional roads and local or urban roads.

4.2 Location tables
4.2.1 General

Within RDS-TMC, locations are identified and referenced by their location code. A given RDS-TMC

service uses a pre-defined location table, containing the pre-stored details of the locations that can be

referenced in messages from that service.

A location code in such a message refers and serves as a tabular ‘address’ of the pre-stored location

details in the location table used by the service. A real-world location may have more than one location

code within the same location table. However, within a given location table, each location code refers to

one and only one location. A location code has a number in the range 1 to 63 487.

In ALERT-C, a further 2048 numbers shall be reserved for INTER-ROAD (see ISO 14819-1) and other

forms of referencing.

A table may contain a maximum number of 65 536 codes allocated in the following way:

Location code Use
0 reserved
1 - 63,487 free for normal location coding
63,488 - 64,511 for special purposes
64,512 - 65,532 for INTER-ROAD
64,533 - 65,535 special functions

NOTE INTER-ROAD is a coding mechanism within ALERT-C to reference in a specific type of ALERT-C

message (the INTER-ROAD message) a location belonging to a different location table. The INTER-ROAD location

can be a table in the same country as well as a table in another country.
2 © ISO 2021 – All rights reserved
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ISO 14819-3:2021(E)
4.2.2 Versions and versioning of location tables

Once a location has been allocated, it cannot easily be re-allocated (in an RDS-TMC/ALERT-C

environment). Therefore, all existing locations and their associated location codes in a given location

table should be regarded as fixed. However, other attributes of a location may, within certain

constraints, sometimes change (e.g. name, positive offset, negative offset).

Within each location table, space (unallocated location codes) shall be left to accommodate future

requirements for additional locations (to deal with new construction and location referencing

requirements not originally foreseen).

Whenever new locations are added to, or removed from, a location table (for example to extend coverage

or to reflect changes to the road network), the resulting table shall be treated as a new version. The

creation and tracking of versions of a location table allows the evolution of a location table to be

understood and supports the successful use of the table and associated TMC service. A new version of

an existing location table shall remain compatible with the previous versions of the same location table

– the changes shall not be such that the location of a TMC message could be wrongly interpreted by a

receiver. For example, location codes which are deleted should not be re-used for a long period. Also,

changing the attributes class and type of a location might cause an incompatible version of the table. It

is part of TISA's location certification process to judge if a table is backwards compatible.

The method for identifying and labelling different versions of a location table is shown in C.3.1.

TISA has established an allocation of location tables to show which are in use or available for use in

each country. The responsible agency in a country may apply for additional location table numbers in

future, to support further applications or more detailed, regional location tables. New tables can also be

issued occasionally to allow for complete updates to existing tables. Such major changes will, however,

be very disruptive for users, as existing receivers will not recognize TMC messages relating to the new

location table unless the same location table is also installed in the receiver. Switches from one location

table to a different one (rather than a new version of the same table) should therefore be avoided as far

as possible, especially in established markets.
4.2.3 Exchanging location tables

For TMC services to work well, the different organizations involved need to be able to understand the

location table number, version and contents. To achieve this, a location table exchange format has been

defined.

This format will be used for the exchange of TMC location tables between the various functional areas,

e.g. receiver manufactures, map providers, certification of TMC location tables, traffic information

centres and service providers.

The location table exchange format specifies the information that shall be provided as part of a location

table, and the way in which it is to be presented. The location table exchange format aims to provide a

complete and precise description of a TMC location table, that is readable from software programmes

without any changes or adaptations.

A location table defined using the location table exchange format consists of a series of text files, each

containing a set of records made up of pre-defined fields. The method for using the location table

exchange format is defined in C.3.2.
4.2.4 Hierarchical structure

RDS-TMC location tables use a hierarchical structure of pre-defined locations. A system of pointers

provides upward references to higher-level locations of which the specified location forms a part.

EXAMPLE Kent would have an upward area reference to South-East England. South-East England can be

referenced up to the UK, then the British Isles, then Europe, etc. (see Figure 1).

© ISO 2021 – All rights reserved 3
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ISO 14819-3:2021(E)
Key
1 County of Kent
2 South East England
3 United Kingdom
4 British Isles
5 Europe
Figure 1 — Upward area referencing

Junction 25 on the M1 motorway in UK would have a linear reference to a motorway segment, e.g.

Leicester - Sheffield. This segment could then be referenced up to the whole road (the M1 Motorway).

Hierarchical tables help to make location referencing simple and unambiguous. A major benefit of

hierarchical tables is that they facilitate automated sorting and selection of information for users.

However, both hierarchical and unstructured tables are currently used in various applications.

4.2.5 Location types

Location types and subtypes are required for language independence of the information given, and to

tell the receiving system what data fields to expect.
At the highest level, locations fall into three categories:
a) area locations;
4 © ISO 2021 – All rights reserved
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ISO 14819-3:2021(E)
b) linear locations;
c) point locations.

Within each category, location types are distinguished (in principle) whenever a location is functionally

distinct in the way it shall be handled by the message recipient. Therefore, a set of predefined location

types and subtypes is set out in Annex A.

Subtypes can be used to give further details of (for example) facilities available at a particular location,

such as a service area. The current list, in Annex A, will be added to as further needs are agreed.

Official translations of the language-independent terms that describe location types and subtypes

should be agreed on a national level.
4.2.6 Offsets

Most point locations and certain linear locations point to previous and next locations of the same type.

This is indicated by negative and positive offsets.

EXAMPLE Junction 25 on a motorway can be offset to Junction 26 in the positive direction, and to Junction

24 in the negative direction. A sign convention adopted at the time of coding locations specifies the positive

direction of travel along each road (see Figure 2).
Positive direction.
Negative offset.
Positive offset.
Figure 2 — Offsets
4.2.7 Direction of the road

The pre-defined direction of the road (see 4.2.6) is reflected in the positive and negative offsets in the

location table and in the order of the names of the end points of a road or road segment (see Table 1).

When newly specifying positive directions along roads within pre-defined tables, it is recommended to

use geographic positive directions relative to the co-ordinate system, i.e. on the Northern Hemisphere

from south to north and from west to east.
For ring roads, the clockwise travel direction is recommended as positive.

It is not permitted in any case to reverse the direction along continuous and/or connecting segments of

a road, e.g. at administrative borders.
4.2.8 Country codes and location table numbers

With ALERT-C, it is assumed that the RDS-TMC service and location tables are organized and defined on

a country-by-country basis.

Each service will by default use a location table uniquely identified by a combination of a location

table number (LTN), a location table country code (LTCC) and a location table extended country code

(LTECC).
© ISO 2021 – All rights reserved 5
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ISO 14819-3:2021(E)

The LTN is a decimal value in the range 1…63. The LTCC is in the range 1…15 (hexadecimal 1…F) and the

LTECC comprises two hexadecimal characters. The combination of LTCC, LTECC, LTN and the location

code within the table defines an extended location code, which is unique worldwide.

A country may use several location tables, and a transmission, although having a ‘default’ location

table, may include messages from adjacent areas with different location tables, using the INTER-ROAD

feature, described in ISO 14819-1.

TISA has established an allocation of LTNs for each country, given in Annex B. As far as possible, the

allocated combinations of LTCC and LTN define a location table uniquely, regardless of the LTECC. This

ensures support for countries where, for historical reasons, the LTECC has not been transmitted.

4.2.9 Constraints

Constraints on location coding may in future be agreed, modelled and documented. At present, however,

national authorities and/or service providers are free to allocate location codes within a location table

as they wish, to locations specified in accordance with these rules.
4.3 TMC location categories, types and subtypes

Location categories, types and location subtypes are standardized and specified in Annex A.

Exceptionally, new subtypes may be proposed to ISO/TC 204 and CEN/TC 278 for approval, registration

and publication. Each location is described by a code, which is composed of:

— a character (A, L or P), indicating the location category (area, linear or point),

— a number indicating the type,
— a dot,
— a number indicating a subtype.
EXAMPLE 1 P1.8 - roundabout (P = point,
...

NORME ISO
INTERNATIONALE 14819-3
Troisième édition
2021-02
Systèmes de transport intelligents —
Informations sur le trafic et les
déplacements via le codage de
messages sur le trafic —
Partie 3:
Références de localisants pour le
système de radiodiffusion de données
- canal de messages d'informations
sur le trafic (RDS-TMC) avec Alert-C
Intelligent transport systems — Traffic and travel information
messages via traffic message coding —
Part 3: Location referencing for Radio Data System-Traffic Message
Channel (RDS-TMC) using ALERT-C
Numéro de référence
ISO 14819-3:2021(F)
ISO 2021
---------------------- Page: 1 ----------------------
ISO 14819-3:2021(F)
DOCUMENT PROTÉGÉ PAR COPYRIGHT
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ii © ISO 2021 – Tous droits réservés
---------------------- Page: 2 ----------------------
ISO 14819-3:2021(F)
Sommaire Page

Avant-propos ..............................................................................................................................................................................................................................iv

Introduction ................................................................................................................................................................................................................................vi

1 Domaine d’application ................................................................................................................................................................................... 1

2 Références normatives ................................................................................................................................................................................... 1

3 Termes, définitions et abréviations .................................................................................................................................................. 1

4 Codage de localisation .................................................................................................................................................................................... 2

4.1 Généralités .................................................................................................................................................................................................. 2

4.2 Tables de localisants ........................................................................................................................................................................... 2

4.2.1 Généralités ............................................................................................................................................................................ 2

4.2.2 Versions et contrôle des versions des tables de localisants ....................................................... 3

4.2.3 Échange de tables de localisants ........................................................................................................................ 4

4.2.4 Structure hiérarchique ............................................................................................................................................... 4

4.2.5 Types de localisations ................................................................................................................................................. 5

4.2.6 Chaînages ............................................................................................................................................................................... 6

4.2.7 Sens de référence de la route ................................................................................................................................ 6

4.2.8 Codes de pays et numéros de tables de localisants ........................................................................... 7

4.2.9 Contraintes ............................................................................................................................................................................ 7

4.3 Catégories, types et sous-types de localisants TMC ................................................................................................ 7

4.4 Contenu de la table de localisants .......................................................................................................................................... 7

4.4.1 Généralités ............................................................................................................................................................................ 7

4.4.2 Contenu nominal d’un enregistrement......................................................................................................... 8

4.4.3 Descriptions des routes ..........................................................................................................................................12

4.4.4 Noms .......................................................................................................................................................................................13

4.4.5 Références ascendantes ..........................................................................................................................................13

4.4.6 Chaînages ............................................................................................................................................................................13

4.4.7 Type urbain .......................................................................................................................................................................13

4.4.8 Référence d’intersection ........................................................................................................................................13

4.4.9 Coordonnées WGS84 .................................................................................................................................................14

4.4.10 InterruptsRoad ...............................................................................................................................................................14

4.5 Référencement détaillé des intersections ....................................................................................................................15

4.5.1 Intersections conventionnelles ........................................................................................................................15

4.5.2 Échangeurs complexes ............................................................................................................................................15

4.5.3 Codage détaillé des bretelles ou collectrices ........................................................................................15

4.6 Localisations détaillées de situation .................................................................................................................................15

4.6.1 Introduction ......................................................................................................................................................................15

4.6.2 Localisation normale .................................................................................................................................................15

4.6.3 Localisation détaillée ................................................................................................................................................16

4.6.4 Localisation de précision .......................................................................................................................................16

4.7 Localisants unidirectionnels et bidirectionnels ......................................................................................................16

4.7.1 Principes de base ..........................................................................................................................................................16

4.7.2 Intersections .....................................................................................................................................................................16

4.7.3 Localisants avec seulement une sortie ou une entrée et localisants

apparaissant d’un seul côté .................................................................................................................................16

4.7.4 DiversionPos/DiversionNeg ...............................................................................................................................18

Annexe A (normative) Catégories, types et sous-types de localisants TMC ..............................................................19

Annexe B (informative) Identification de table de localisants ...............................................................................................29

Annexe C (normative) Méthodes d’utilisation détaillées des tables de localisants .........................................37

Annexe D (informative) Informations de base ........................................................................................................................................75

Bibliographie ...........................................................................................................................................................................................................................77

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ISO 14819-3:2021(F)
Avant-propos

L'ISO (Organisation internationale de normalisation) est une fédération mondiale d'organismes

nationaux de normalisation (comités membres de l'ISO). L'élaboration des Normes internationales est

en général confiée aux comités techniques de l'ISO. Chaque comité membre intéressé par une étude

a le droit de faire partie du comité technique créé à cet effet. Les organisations internationales,

gouvernementales et non gouvernementales, en liaison avec l'ISO participent également aux travaux.

L'ISO collabore étroitement avec la Commission électrotechnique internationale (CEI) en ce qui

concerne la normalisation électrotechnique.

Les procédures utilisées pour élaborer le présent document et celles destinées à sa mise à jour sont

décrites dans les Directives ISO/IEC, Partie 1. Il convient, en particulier de prendre note des différents

critères d'approbation requis pour les différents types de documents ISO. Le présent document a été

rédigé conformément aux règles de rédaction données dans les Directives ISO/IEC, Partie 2 (voir www

.iso .org/ directives).

L'attention est attirée sur le fait que certains des éléments du présent document peuvent faire l'objet de

droits de propriété intellectuelle ou de droits analogues. L'ISO ne saurait être tenue pour responsable

de ne pas avoir identifié de tels droits de propriété et averti de leur existence. Les détails concernant

les références aux droits de propriété intellectuelle ou autres droits analogues identifiés lors de

l'élaboration du document sont indiqués dans l'Introduction et/ou dans la liste des déclarations de

brevets reçues par l'ISO (voir www .iso .org/ brevets).

Les appellations commerciales éventuellement mentionnées dans le présent document sont données

pour information, par souci de commodité, à l’intention des utilisateurs et ne sauraient constituer un

engagement.

Pour une explication de la nature volontaire des normes, la signification des termes et expressions

spécifiques de l'ISO liés à l'évaluation de la conformité, ou pour toute information au sujet de l'adhésion

de l'ISO aux principes de l’Organisation mondiale du commerce (OMC) concernant les obstacles

techniques au commerce (OTC), voir www .iso .org/ avant -propos.

Le présent document a été préparé par le comité technique ISO/TC 204, Systèmes de transport intelligents,

en collaboration avec le Comité technique CEN/TC 278 du Comité européen de normalisation (CEN),

Systèmes de transport intelligents, conformément à l'accord de coopération technique entre l'ISO et le

CEN (Accord de Vienne).

Cette troisième édition annule et remplace la deuxième édition (ISO 14819-3:2013), qui a fait l’objet

d’une révision technique.

Les principales modifications par rapport à l'édition précédente sont les suivantes:

Les spécifications suivantes de la TISA ont été intégrées:
— Format 24 d'échange des tables de localisants.
— Réutilisation des codes de localisants.
— Traduction des numéros de route et d'intersection.
— Codage des zones isolées.
— Identificateurs de langue.
— Rétrocompatibilité.
— Codage des traductions des noms et des langues dans les Tableaux TMC.
— Méthodes DLR.

Une liste de toutes les parties dans la série ISO 14819 se trouve sur le site web de l'ISO.

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ISO 14819-3:2021(F)

Il convient que l’utilisateur adresse tout retour d’information ou toute question concernant le présent

document à l’organisme national de normalisation de son pays. Une liste exhaustive desdits organismes

se trouve à l’adresse www .iso .org/ fr/ members .html.
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ISO 14819-3:2021(F)
Introduction

Le présent document répond principalement aux besoins des messages RDS-TMC avec ALERT-C qui

sont largement utilisés dans le monde entier. L'approche modulaire utilisée ici est destinée à faciliter

l'extension future des règles de localisation à d'autres systèmes de diffusion de messages de trafic et de

déplacement.

Le présent document définit les moyens de spécifier les endroits et les positions dans les messages

d’information sur le trafic et le tourisme, y compris les messages RDS-TMC (le système de radiodiffusion

de données - Canal de messages d’informations sur le trafic).

Il définit la structure et la sémantique des tables de localisants pour les Centres d’Information Routière

(TIC) et les récepteurs.
a) Messages d’informations sur le trafic et le tourisme:

1) Les informations sur le trafic et le tourisme sont créées et mises à jour dans une base de

données source, par des opérateurs humains ou des systèmes automatisés. Les informations

sont transférées par des messages en direction d’un ou de plusieurs systèmes distants.

2) Dans ce contexte, un message est un ensemble de données échangé pour transporter des

informations dans un but convenu entre deux ou plusieurs parties. Les messages d’informations

sur le trafic et le tourisme sont des ensembles de données codées numériquement, échangées

par les parties concernées et transportant des informations relatives au trafic, au tourisme et/

ou aux réseaux de transport. Le codage numérique peut être alphanumérique, comme dans

EDIFACT, ou binaire comme dans le RDS-TMC.

3) Les messages d’informations sur le trafic et le tourisme développés dans les programmes de

l’Union Européenne sont des propositions ouvertes et non propriétaires de normes destinées

à servir l’intérêt public en facilitant l’interconnexion et l’interopérabilité des systèmes

d’information intéressés.
b) Référence de localisant.

Les références de localisant donnent le moyen de distinguer un emplacement dans les messages

d’informations sur le trafic et le tourisme.

Le composant de référence de localisant d’un message d’informations sur le trafic et le tourisme permet

à un fournisseur de service d’indiquer l’emplacement physique de l’événement décrit. La gestion des

bases de données de localisation TMC nécessite une maintenance continue. Il est nécessaire à la fois

de gérer l’attribution d’identifiants de tables de localisants pour les pays qui mettent en œuvre des

services TMC, de valider les bases de données de localisation nouvelles et de les mettre à jour lorsque

les caractéristiques terrain changent. Ces activités sont menées par des prestataires de services qui

doivent également veiller à ce que leurs utilisateurs finals soient tenus au courant des mises à jour.

L'Association pour les services d’information aux voyageurs (TISA) (www .tisa .org) gère l’attribution

des identifiants dans le monde entier. La TISA assure la validation des bases de données de localisation

pour les fournisseurs de service qui organisent généralement des mises à jour semestrielles de leurs

bases de données de localisation. Cette procédure de certification étend les règles de base mentionnées

dans cette norme et applique également une validation des meilleures pratiques. La TISA accorde un

label de qualité aux tables de localisants qui passent avec succès une série de tests. Cette procédure

de certification étend les règles de base mentionnées dans cette norme et applique également une

validation des meilleures pratiques. La TISA accorde un label de qualité aux tables de localisants qui

passent avec succès une série de tests.
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NORME INTERNATIONALE ISO 14819-3:2021(F)
Systèmes de transport intelligents — Informations sur le
trafic et les déplacements via le codage de messages sur le
trafic —
Partie 3:
Références de localisants pour le système de radiodiffusion
de données - canal de messages d'informations sur le trafic
(RDS-TMC) avec Alert-C
1 Domaine d’application

Le présent document spécifie les règles de référence de localisant pour couvrir les exigences spécifiques

des systèmes TMC (Traffic Message Channel - Canal de messages d'informations sur le trafic), qui

utilisent des formats de codage abrégés pour fournir des messages d'informations sur le trafic et les

déplacements (TTI) en utilisant des supports mobiles (par exemple: GSM, DAB) ou des protocoles

d’échange tels que DATEX II. Ces règles traitent notamment du système de radiodiffusion de données

- Canal de messages d’informations sur le trafic (RDS-TMC) qui est un moyen de fournir des messages

TTI codées numériquement à des usagers en utilisant un canal de données silencieux diffusé par des

stations de radiodiffusion en FM, sur la base du protocole ALERT-C.
2 Références normatives

Les documents suivants sont cités dans le texte de sorte qu’ils constituent, pour tout ou partie de leur

contenu, des exigences du présent document. Pour les références datées, seule l’édition citée s’applique.

Pour les références non datées, la dernière édition du document de référence s'applique (y compris les

éventuels amendements).

ISO 639-1, Codes pour la représentation des noms de langue — Partie 1: Code alpha-2

ISO 14819-1, Systèmes de transport intelligents — Informations sur le trafic et les déplacements via le

codage de messages sur le trafic — Partie 1: Protocole de codage pour le système de radiodiffusion de

données — canal de messages d’informations sur le trafic (RDS-TMC) avec ALERT-C

ISO 15924, Information et documentation — Codes pour la représentation des noms d’écritures

3 Termes, définitions et abréviations
Aucun terme n’est défini dans le présent document.

L’ISO et l’IEC tiennent à jour des bases de données terminologiques destinées à être utilisées en

normalisation, consultables aux adresses suivantes:

— ISO Online browsing platform: disponible à l’adresse https:// www .iso .org/ obp

— IEC Electropedia: disponible à l’adresse http:// www .electropedia .org/
Pour les besoins du présent document, les abréviations suivantes s’appliquent:

ALERT-C Advice and Problem Location for Euro- Avertissement et localisation des difficultés

pean Road Traffic, Version C sur le trafic routier européen, Version C
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ISO 14819-3:2021(F)

ASCII American Standard Code for Information Code américain normalisé pour l’échange

Interchange d’information
CCD country code code pays
CID country identifier identifiant du pays
CLST code of location subtype code du sous-type de localisant
CNAME country name nom de pays

ECC extended country code (an RDS feature) code de pays étendu (fonctionnalité RDS)

EDIFACT Electronic data interchange for adminis- Échange de données informatisées pour l’ad-

tration commerce and transport ministration, le commerce et les transports

GDF geographic data files for modelling and fichiers de données géographiques pour

exchange of geographic data for transport la modélisation et l’échange de données

telematics applications) géographiques destinées à des applications
télématiques pour le transport
LC location code code localisant
LTCC location table country code code pays de la table de localisants
LTN location table number numéro de la table de localisants
POI point of interest point d’intérêt
RDS radio data system (digital information système de radiodiffusion de données
channel on FM sub carrier) (canal d’informations numériques sur une
sous-porteuse en modulation de fréquence)
TIC traffic information centre centre d’information routière

TISA Traveller Information Services Association Association pour les services d’information

aux voyageurs
TMC traffic message channel canal de messages d’informations sur le
trafic
TTI traffic and travel information informations sur le trafic et les déplace-
ments
WGS84 World Geodetic System 1984 Système géodésique mondial 1984
4 Codage de localisation
4.1 Généralités

Les références des localisants utilisés par le système RDS-TMC sont couvertes par les règles de

localisation définies dans le présent article. Le protocole de codage ALERT-C pour le RDS-TMC est défini

dans l’ISO 14819-1

Le protocole ALERT-C utilise un service de radiodiffusion de données numérique et silencieux destiné

aux automobilistes et fournissant des informations relatives à de nombreux types de situations de

trafic. Cela comprend les informations sur les chantiers, la météorologie et les incidents de la circulation

concernant les principales routes nationales et internationales, les routes régionales ainsi que les voies

locales ou urbaines.
4.2 Tables de localisants
4.2.1 Généralités

Dans le système RDS-TMC, les lieux sont identifiés et référencés par leur code de localisation. Un

service RDS-TMC utilise une table de localisants prédéfinie contenant une description détaillée de lieux

préenregistrés qui peuvent être référencés dans les messages en provenance de ce service.

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ISO 14819-3:2021(F)

Un code de localisation utilisé dans un tel message sert d’adresse pour accéder aux détails de localisation

préenregistrés dans la table de localisants utilisée par le service. Concrètement, un localisant peut

comporter plusieurs codes de localisation dans la même table de localisants. Cependant, dans une table

de localisants donnée, chaque code de localisation fait référence à un seul et unique lieu. Un code de

localisation est numéroté dans une plage allant de 1 à 63 487.

Dans ALERT-C, 2048 autres numéros doivent être réservés pour INTER-ROAD (voir ISO 14819-1) et les

autres formes de localisation.

Un tableau peut contenir au maximum 65 536 codes attribués de la manière suivante:

Code de localisation Utilisation
0 réservé
1 - 63,487 libre pour codage de localisants normaux
63,488 - 64,511 pour des besoins particuliers
64,512 - 65,532 pour INTER-ROAD
64,533 - 65,535 fonctions spéciales

NOTE INTER-ROAD est un mécanisme de codage dans le protocole ALERT-C permettant de référencer dans

un type spécifique de message ALERT-C (le message INTER-ROAD) un localisant appartenant à une table de

localisants différente. Le localisant INTER-ROAD peut être aussi bien d'une table du même pays que d'une table

d’un pays différent.
4.2.2 Versions et contrôle des versions des tables de localisants

Une fois qu’un localisant a été attribué, il ne peut pas être facilement réattribué (dans un environnement

RDS-TMC/ALERT-C). Il convient par conséquent de considérer comme fixes tous les localisants existants

et les codes qui leur sont associés. Il est admis cependant que d’autres attributs d’un localisant donné

puissent, dans certaines conditions, être quelquefois modifiés (par exemple, le nom, le chaînage positif,

le chaînage négatif).

Dans chaque table de localisants, un espace (c’est-à-dire des codes de localisation non attribués) doit

être laissé libre pour répondre à de futures exigences de localisants supplémentaires (pour de nouvelles

constructions et pour des exigences de localisation non prévues initialement).

Chaque fois que de nouveaux localisants sont ajoutés ou retirés d’une table de localisants (par

exemple pour étendre la couverture ou pour refléter des changements sur le réseau routier), la table

résultante doit être traitée comme une nouvelle version. La création et le suivi des versions d’une

table de localisants aident à comprendre l’évolution de cette table de localisants et permettent de bien

utiliser la table et le service TMC associé. Une nouvelle version d’une table de localisants existante doit

rester compatible avec les versions antérieures de la même table de localisants. Il ne faut pas que les

modifications puissent conduire à une mauvaise interprétation du localisant d’un message TMC par un

récepteur. Par exemple, il convient que les codes de localisation supprimés ne soient plus utilisés sur

une longue période. De même, le changement de la classe et du type des attributs d’un localisant est

susceptible d’engendrer une version incompatible de la table. Il appartient à TISA, dans le cadre de son

processus de certification de localisants, de décider si une table est rétrocompatible ou non.

La méthode d’identification et d’étiquetage des différentes versions d’une table de localisants est

présentée en C.3.1.

La TISA a institué une attribution de tables de localisants pour indiquer celles qui sont en cours

d’utilisation ou disponibles en vue de leur utilisation dans chaque pays. L’autorité compétente en la

matière dans un pays donné peut demander des numéros supplémentaires de tables de localisants à

l’appui d’applications futures ou pour des tables de localisants régionales plus détaillées. De nouvelles

tables peuvent également être publiées de temps en temps pour permettre des mises à jour complètes

des tables existantes. Cependant, ces modifications majeures seront extrêmement perturbatrices pour

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ISO 14819-3:2021(F)

les utilisateurs car les récepteurs existants ne reconnaîtront pas les messages TMC relatifs à la nouvelle

table de localisants à moins que cette même table soit aussi installée dans le récepteur. Par conséquent,

il convient que les passages d’une table de localisants à une autre (plutôt qu’à une nouvelle version de la

même table) soient autant que possible évités, notamment dans les marchés bien établis.

4.2.3 Échange de tables de localisants

Pour que les services TMC fonctionnent bien, il faut que les différentes organisations impliquées soient

en mesure de comprendre le numéro, la version et le contenu de la table de localisants. Pour ce faire, un

format d’échange de tables de localisants a été défini.

Ce format sert à l’échange des tables de localisants TMC entre les différentes zones fonctionnelles, par

exemple les fabricants de récepteurs, les fournisseurs de cartes, la certification des tables de localisants

TMC, les centres d’information routière et les fournisseurs de service.

Le format d’échange de tables de localisants spécifie l’information qui doit être fournie comme élément

d’une table de localisants, et la façon dont elle doit être présentée. Le but de ce format d’échange est de

fournir une description complète et précise d’une table de localisants TMC, qui soit interprétable par

des logiciels sans aucune modification ni adaptation.

Une table de localisants définie, utilisant le format d’échange de tables de localisants, comprend

une série de fichiers texte, contenant chacun un ensemble d’enregistrements composés de champs

prédéfinis. La méthode d’utilisation du format d’échange de tables de localisants est définie en C.3.2.

4.2.4 Structure hiérarchique

Les tables de localisants RDS-TMC utilisent une structure hiérarchique de localisants prédéfinis. Un

système de pointeurs fournit des références ascendantes à des localisants de niveau supérieur dont le

localisant spécifié fait partie.

EXEMPLE La région du Kent a ainsi une référence zonale ascendante au Sud-Est de l’Angleterre. Le Sud-Est

de l’Angleterre peut avoir une référence ascendante au Royaume-Uni, puis aux îles Britanniques, puis à l’Europe,

etc. (voir en Figure 1).
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ISO 14819-3:2021(F)
Légende
1 Comté de Kent
2 Sud-Est de l’Angleterre
3 Royaume-Uni
4 Iles Britanniques
5 Europe
Figure 1 — Référencement zonal ascendant

L’échangeur 25 sur l’autoroute M1 au Royaume-Uni a ainsi une référence linéaire à un segment

d’autoroute, par exemple Leicester - Sheffield. Ce segment peut avoir une référence ascendante à

l’ensemble de la route (l’autoroute M1).

Les tables hiérarchiques permettent de simplifier et d’éviter toute ambiguïté du référencement

géographique. L’un des principaux av
...

INTERNATIONAL ISO
STANDARD 14819-3
Third edition
Intelligent transport systems — Traffic
and travel information messages via
traffic message coding —
Part 3:
Location referencing for Radio Data
System — Traffic Message Channel
(RDS-TMC) using ALERT-C
Systèmes intelligents de transport — Informations sur le trafic et le
tourisme via le codage de messages sur le trafic —
Partie 3: Références de localisants pour le système de radiodiffusion
de données (RDS) — Canal de messages d'informations sur le trafic
(RDS-TMC) avec ALERT-C
PROOF/ÉPREUVE
Reference number
ISO 14819-3:2020(E)
ISO 2020
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ISO 14819-3:2020(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2020

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
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ISO 14819-3:2020(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

3.1 Abbreviated terms ............................................................................................................................................................................... 1

4 Location coding ...................................................................................................................................................................................................... 2

4.1 General ........................................................................................................................................................................................................... 2

4.2 Location tables ........................................................................................................................................................................................ 2

4.2.1 General...................................................................................................................................................................................... 2

4.2.2 Versions and versioning of location tables ................................................................................................ 3

4.2.3 Exchanging location tables ...................................................................................................................................... 3

4.2.4 Hierarchical structure ................................................................................................................................................. 4

4.2.5 Location types .................................................................................................................................................................... 5

4.2.6 Offsets ........................................................................................................................................................................................ 5

4.2.7 Direction of the road ..................................................................................................................................................... 5

4.2.8 Country codes and location table numbers .............................................................................................. 6

4.2.9 Constraints ............................................................................................................................................................................ 6

4.3 TMC location categories, types and subtypes .............................................................................................................. 6

4.4 Location table content ...................................................................................................................................................................... 6

4.4.1 General...................................................................................................................................................................................... 6

4.4.2 Nominal record content ............................................................................................................................................. 7

4.4.3 Road descriptions ........................................................................................................................................................11

4.4.4 Names .....................................................................................................................................................................................12

4.4.5 Upward references ......................................................................................................................................................12

4.4.6 Offsets .....................................................................................................................................................................................12

4.4.7 Urban ......................................................................................................................................................................................12

4.4.8 Intersection reference ..............................................................................................................................................12

4.4.9 WGS 84 co-ordinates .................................................................................................................................................13

4.4.10 InterruptsRoad ...............................................................................................................................................................13

4.5 Detailed junction referencing ..................................................................................................................................................14

4.5.1 Conventional junctions ............................................................................................................................................14

4.5.2 Complex junctions .......................................................................................................................................................14

4.5.3 Detailed coding of link roads ..............................................................................................................................14

4.6 Detailed situation locations ......................................................................................................................................................14

4.6.1 Introduction ......................................................................................................................................................................14

4.6.2 Normal location referencing ...............................................................................................................................14

4.6.3 Detailed location referencing .............................................................................................................................15

4.6.4 Precise location referencing ................................................................................................................................15

4.7 One- and two-way locations .....................................................................................................................................................15

4.7.1 Basic principles ..............................................................................................................................................................15

4.7.2 Junctions ..............................................................................................................................................................................15

4.7.3 Locations with only an exit or entry and locations occurring on one side only.....15

4.7.4 DiversionPos / DiversionNeg .............................................................................................................................17

Annex A (normative) TMC location categories, types and subtypes ................................................................................18

Annex B (informative) Location table identification ........................................................................................................................26

Annex C (normative) Detailed methods for the usage of location tables ....................................................................32

Annex D (informative) Background information .................................................................................................................................67

Bibliography .............................................................................................................................................................................................................................69

© ISO 2020 – All rights reserved PROOF/ÉPREUVE iii
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ISO 14819-3:2020(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee ISO/TC 204, Intelligent transport systems, in

collaboration with the European Committee for Standardization (CEN) Technical Committee CEN/TC

278, Intelligent transport systems, in accordance with the Agreement on technical cooperation between

ISO and CEN (Vienna Agreement).
A list of all parts in the ISO 14819 series can be found on the ISO website.

This third edition cancels and replaces the second edition (ISO 14819-3:2013), which has been

technically revised.
The main changes compared to the previous edition are as follows:
The following TISA specifications were integrated:
— Location Table Exchange Format 24
— Reuse-of-location-codes
— Roads-and-Junction-number-translation
— Coding of isolated areas
— Language identifiers
— Backward compatibility
— Coding of name translations and languages in TMC tables
— DLR methods for locations in TMC Location

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html.
iv PROOF/ÉPREUVE © ISO 2020 – All rights reserved
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ISO 14819-3:2020(E)
Introduction

This document primarily addresses the needs of RDS-TMC ALERT-C messages which are in widespread

worldwide use. The modular approach used here is intended to facilitate future extension of the location

referencing rules to other traffic and travel messaging systems.

This document sets out ways of specifying places and positions in traffic and travel information

messages, including RDS-TMC messages (the Radio Data System-Traffic Message Channel).

It defines the structure and semantics of location tables for Traffic Information Centres (TICs) and

receivers.
a) Traffic and travel messages:

1) Traffic and travel information is created and updated in an originating database, by human

operators or automated systems. Information is transferred to one or more remote systems by

means of messages.

2) In this context, a message is a collection of data which is exchanged to convey information for an

agreed purpose between two or more parties. Traffic and travel messages are digitally-coded

sets of data exchanged by interested parties, which convey information about traffic, travel

and/or transport networks. Digital coding may be alphanumeric, as in EDIFACT, or binary, as in

RDS-TMC.

3) The traffic and travel messages developed in programmes of the European Union are open,

non-proprietary proposals for standards intended to serve the public interest by facilitating

interconnection and interoperability of the relevant information systems.
b) Location referencing.

Location references provide the means of saying where in traffic and travel messages.

The location referencing component of a traffic and travel message enables a service provider to indicate

the physical location of the event being described. The management of TMC location databases requires

on-going maintenance. It is necessary to both manage location database ID allocation for countries

implementing TMC services and to validate new and updated location databases when ground features

change. These activities are led by service providers who also need to ensure that their end-users

are kept up-to-date. The Traveller Information Services Association (www .tisa .org) manages the ID

allocation on a worldwide basis. TISA provides location database validation for service providers who

generally arrange location database updates on a bi-annual cycle. This certification procedure extends

the basic rules mentioned in this standard and also applies a best-practice validation. TISA grants a

stamp of quality to those location tables that pass a set of tests.
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INTERNATIONAL STANDARD ISO 14819-3:2020(E)
Intelligent transport systems — Traffic and travel
information messages via traffic message coding —
Part 3:
Location referencing for Radio Data System — Traffic
Message Channel (RDS-TMC) using ALERT-C
1 Scope

This document specifies location referencing rules to address the specific requirements of Traffic

Message Channel (TMC) systems, which use abbreviated coding formats to provide traffic and travel

information (TTI) messages over mobile bearers (e.g. GMS, DAB) or via exchange protocols like DATEX

II. In particular, the rules address the Radio Data System-Traffic Message Channel (RDS-TMC), a means

of providing digitally-coded TTI to travellers using a silent data channel on FM radio stations, based on

the ALERT-C protocol.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

ISO 14819-1, Intelligent transport systems — Traffic and travel information messages via traffic message

coding — Part 1: Coding protocol for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

ISO 639-1, Codes for the representation of names of languages — Part 1: Alpha-2 code

ISO 15924, Information and documentation — Codes for the representation of names of scripts

3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 Abbreviated terms
For the purposes of this document, the following abbreviated terms apply:
ALERT-C Advice and Problem Location for European Road Traffic, Version C
ASCII American Standard Code for Information Interchange
CCD country code
CID country identifier
CLST code of location subtype
CNAME country name
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ISO 14819-3:2020(E)
ECC extended country code
EDIFACT Electronic data interchange for administration commerce and transport

GDF geographic data files (for modelling and exchange of geographic data for transport

telematics applications)
LC location code
LTCC location table country code
LTN location table number
POI point of interest
RDS radio data system (digital information channel on FM sub carrier)
TIC traffic information centre
TISA Traveller Information Services Association
TMC traffic message channel
TTI traffic and travel information
WGS 84 World Geodetic System 1984
4 Location coding
4.1 General

Location references used by RDS-TMC are covered by the location referencing rules defined in this

subclause. The ALERT-C coding protocol for RDS-TMC is defined in ISO 14819-1.

ALERT-C supports a digital, silent data broadcast service for motorists, providing information about

many kinds of traffic situations. This includes roadwork, weather and traffic incident information

relating to major national and international roads, regional roads and local or urban roads.

4.2 Location tables
4.2.1 General

Within RDS-TMC, locations are identified and referenced by their location code. A given RDS-TMC

service uses a pre-defined location table, containing the pre-stored details of the locations that can be

referenced in messages from that service.

A location code in such a message refers and serves as a tabular ‘address’ of the pre-stored location

details in the location table used by the service. A real-world location may have more than one location

code within the same location table. However, within a given location table, each location code refers to

one and only one location. A location code has a number in the range 1 to 63 487.

In ALERT-C, a further 2048 numbers shall be reserved for INTER-ROAD (see ISO 14819-1) and other

forms of referencing.

A table may contain a maximum number of 65 536 codes allocated in the following way:

Location code Use
0 reserved
1 - 63,487 free for normal location coding
63,488 - 64,511 for special purposes
64,512 - 65,532 for INTER-ROAD
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ISO 14819-3:2020(E)
Location code Use
64,533 - 65,535 special functions

NOTE INTER-ROAD is a coding mechanism within ALERT-C to reference in a specific type of ALERT-C

message (the INTER-ROAD message) a location belonging to a different location table. The INTER-ROAD location

can be a table in the same country as well as a table in another country.
4.2.2 Versions and versioning of location tables

Once a location has been allocated, it cannot easily be re-allocated (in an RDS-TMC/ALERT-C

environment). Therefore, all existing locations and their associated location codes in a given location

table should be regarded as fixed. However, other attributes of a location may, within certain

constraints, sometimes change (e.g. name, positive offset, negative offset).

Within each location table, space (unallocated location codes) shall be left to accommodate future

requirements for additional locations (to deal with new construction and location referencing

requirements not originally foreseen).

Whenever new locations are added to, or removed from, a location table (for example to extend coverage

or to reflect changes to the road network), the resulting table shall be treated as a new version. The

creation and tracking of versions of a location table allows the evolution of a location table to be

understood and supports the successful use of the table and associated TMC service. A new version of

an existing location table shall remain compatible with the previous versions of the same location table

– the changes shall not be such that the location of a TMC message could be wrongly interpreted by a

receiver. For example, location codes which are deleted should not be re-used for a long period. Also,

changing the attributes class and type of a location might cause an incompatible version of the table. It

is part of TISA's location certification process to judge if a table is backwards compatible.

The method for identifying and labelling different versions of a location table is shown in C.3.1.

TISA has established an allocation of location tables to show which are in use or available for use in

each country. The responsible agency in a country may apply for additional location table numbers in

future, to support further applications or more detailed, regional location tables. New tables can also be

issued occasionally to allow for complete updates to existing tables. Such major changes will, however,

be very disruptive for users, as existing receivers will not recognize TMC messages relating to the new

location table unless the same location table is also installed in the receiver. Switches from one location

table to a different one (rather than a new version of the same table) should therefore be avoided as far

as possible, especially in established markets.
4.2.3 Exchanging location tables

For TMC services to work well, the different organizations involved need to be able to understand the

location table number, version and contents. To achieve this, a location table exchange format has been

defined.

This format will be used for the exchange of TMC location tables between the various functional areas,

e.g. receiver manufactures, map providers, certification of TMC location tables, traffic information

centres and service providers.

The location table exchange format specifies the information that shall be provided as part of a location

table, and the way in which it is to be presented. The location table exchange format aims to provide a

complete and precise description of a TMC location table, that is readable from software programmes

without any changes or adaptations.

A location table defined using the location table exchange format consists of a series of text files, each

containing a set of records made up of pre-defined fields. The method for using the location table

exchange format is defined in C.3.2.
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ISO 14819-3:2020(E)
4.2.4 Hierarchical structure

RDS-TMC location tables use a hierarchical structure of pre-defined locations. A system of pointers

provides upward references to higher-level locations of which the specified location forms a part.

EXAMPLE Kent would have an upward area reference to South-East England. South-East England can be

referenced up to the UK, then the British Isles, then Europe, etc. (see Figure 1).

Key
1 County of Kent
2 South East England
3 United Kingdom
4 British Isles
5 Europe
Figure 1 — Upward area referencing

Junction 25 on the M1 motorway in UK would have a linear reference to a motorway segment, e.g.

Leicester - Sheffield. This segment could then be referenced up to the whole road (the M1 Motorway).

Hierarchical tables help to make location referencing simple and unambiguous. A major benefit of

hierarchical tables is that they facilitate automated sorting and selection of information for users.

However, both hierarchical and unstructured tables are currently used in various applications.

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ISO 14819-3:2020(E)
4.2.5 Location types

Location types and subtypes are required for language independence of the information given, and to

tell the receiving system what data fields to expect.
At the highest level, locations fall into three categories:
a) area locations;
b) linear locations;
c) point locations.

Within each category, location types are distinguished (in principle) whenever a location is functionally

distinct in the way it shall be handled by the message recipient. Therefore, a set of predefined location

types and subtypes is set out in Annex A.

Subtypes can be used to give further details of (for example) facilities available at a particular location,

such as a service area. The current list, in Annex A, will be added to as further needs are agreed.

Official translations of the language-independent terms that describe location types and subtypes

should be agreed on a national level.
4.2.6 Offsets

Most point locations and certain linear locations point to previous and next locations of the same type.

This is indicated by negative and positive offsets.

EXAMPLE Junction 25 on a motorway can be offset to Junction 26 in the positive direction, and to Junction

24 in the negative direction. A sign convention adopted at the time of coding locations specifies the positive

direction of travel along each road (see Figure 2).
Key
a positive direction
b negative offset
c positive offset
Figure 2 — Offsets
4.2.7 Direction of the road

The pre-defined direction of the road (see 4.2.6) is reflected in the positive and negative offsets in the

location table and in the order of the names of the end points of a road or road segment (see Table 1).

When newly specifying positive directions along roads within pre-defined tables, it is recommended to

use geographic positive directions relative to the co-ordinate system, i.e. on the Northern Hemisphere

from south to north and from west to east.
For ring roads, the clockwise travel direction is recommended as positive.

It is not permitted in any case to reverse the direction along continuous and/or connecting segments of

a road, e.g. at administrative borders.
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ISO 14819-3:2020(E)
4.2.8 Country codes and location table numbers

With ALERT-C, it is assumed that the RDS-TMC service and location tables are organized and defined on

a country-by-country basis.

Each service will by default use a location table uniquely identified by a combination of a location

table number (LTN), a location table country code (LTCC) and a location table extended country code

(LTECC).

The LTN is a decimal value in the range 1…63. The LTCC is in the range 1…15 (hexadecimal 1…F) and the

LTECC comprises two hexadecimal characters. The combination of LTCC, LTECC, LTN and the location

code within the table defines an extended location code, which is unique worldwide.

A country may use several location tables, and a transmission, although having a ‘default’ location

table, may include messages from adjacent areas with different location tables, using the INTER-ROAD

feature, described in ISO 14819-1.

TISA has established an allocation of LTNs for each country, given in Annex B. As far as possible, the

allocated combinations of LTCC and LTN define a location table uniquely, regardless of the LTECC. This

ensures support for countries where, for historical reasons, the LTECC has not been transmitted.

4.2.9 Constraints

Constraints on location coding may in future be agreed, modelled and documented. At present, however,

national authorities and/or service providers are free to allocate location codes within a location table

as they wish, to locations specified in accordance with these rules.
4.3 TMC location categories, types and subtypes

Location categories, types and location subtypes are standardized and specified in Annex A.

...

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