ISO 14819-3:2021
(Main)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
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
Relations
Buy Standard
Standards Content (Sample)
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
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
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
---------------------- Page: 3 ----------------------
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
---------------------- Page: 4 ----------------------
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
---------------------- Page: 5 ----------------------
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
---------------------- Page: 6 ----------------------
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
---------------------- Page: 7 ----------------------
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
---------------------- Page: 8 ----------------------
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
---------------------- Page: 9 ----------------------
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).
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.
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
---------------------- Page: 10 ----------------------
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
© ISO 2021
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
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
© ISO 2021 – Tous droits réservés iii
---------------------- Page: 3 ----------------------
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.
iv © ISO 2021 – Tous droits réservés
---------------------- Page: 4 ----------------------
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.
© ISO 2021 – Tous droits réservés v
---------------------- Page: 5 ----------------------
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.
vi © ISO 2021 – Tous droits réservés
---------------------- Page: 6 ----------------------
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
© ISO 2021 – Tous droits réservés 1
---------------------- Page: 7 ----------------------
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.
2 © ISO 2021 – Tous droits réservés
---------------------- Page: 8 ----------------------
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
© ISO 2021 – Tous droits réservés 3
---------------------- Page: 9 ----------------------
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).
4 © ISO 2021 – Tous droits réservés
---------------------- Page: 10 ----------------------
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
---------------------- Page: 1 ----------------------
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 2 ----------------------
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
---------------------- Page: 3 ----------------------
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
---------------------- Page: 4 ----------------------
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.
© ISO 2020 – All rights reserved PROOF/ÉPREUVE v
---------------------- Page: 5 ----------------------
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
© ISO 2020 – All rights reserved PROOF/ÉPREUVE 1
---------------------- Page: 6 ----------------------
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
2 PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 7 ----------------------
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.
© ISO 2020 – All rights reserved PROOF/ÉPREUVE 3
---------------------- Page: 8 ----------------------
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.
4 PROOF/ÉPREUVE © ISO 2020 – All rights reserved
---------------------- Page: 9 ----------------------
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.
© ISO 2020 – All rights reserved PROOF/ÉPREUVE 5
---------------------- Page: 10 ----------------------
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.
E
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.