Intelligent transport systems - Cooperative systems - Contextual speeds (ISO/TS 17426:2016)

ISO/TS 17426:2016
- specifies the Contextual Speed Information Service, namely the general requirements regarding the provision of the Contextual Speed Information Service, the data flow supporting the service, and the presentation of the service result,
- specifies the requirements to be fulfilled by the Contextual Speed Information Service,
- specifies the ITS Station (ITS-S) application processes of the vehicle ITS station, roadside ITS station, central ITS station, and personal ITS station that are required to instantiate the Contextual Speed Information Service,
- specifies sets of communication requirements and objectives (profiles) using the methods defined in ISO 17423 to select the level of performance (best effort or real-time, etc.), confidence and security (authentication, encryption, etc.) for each Contextual Speed Information Service communication flow between ITS stations,
- selects relevant functions and procedures provided by the ITS station facilities layer (see ISO 17429), and
- specifies messages, messages sets structure, content, and syntax to be used by the Contextual Speed Information Service.
ISO/TS 17426:2016 considers the scenario for the transmission of Contextual Speed information from the infrastructure/roadside to the vehicle, for onward presentation to the vehicle's driver. This scenario foresees that the calculation of Contextual Speed information is performed on the Infrastructure side, not within the vehicle.
Mandatory speed limits or advisory speed recommendations are output of the Contextual Speed Information Service which (in the scenario considered in this Technical Specification) is run by the Road Operator in its Traffic Control Centre or comparable infrastructure (e.g. Roadside ITS Station). To transfer this information to the vehicle (and therefore the driver) over the air (wireless communication), defined messages are required. These messages are specified in this Technical Specification.
When Contextual Speed information arrives in the vehicle, further pre-processing might be necessary before the Contextual Speed information, and, if available, additional explanations on speed limits or recommendations, can be presented to the driver. This Technical Specification specifies the requirements that need to be fulfilled when processing the messages. It does not specify how the vehicle handles the incoming messages.
The production of information supporting this application, its qualification and its relevance are out of the scope of this Technical Specification.
ISO/TS 17426:2016 addresses Use Case 1 "Provision of mandatory speed limit information into vehicle ? for driver awareness purposes" and Use Case 2 "Provision of advisory speed information into vehicle ? for driver awareness purposes".

Intelligente Transportsysteme (ITS) - Kooperative Systeme - Kontextuelle Geschwindigkeiten (ISO/TS 17426:2016)

Systèmes intelligents de transport - Systèmes coopératifs - Vitesses contextuelles (ISO/TS 17426:2016)

Inteligentni transportni sistemi - Kooperativni sistemi - Kontekstualne hitrosti (ISO/TS 17426:2016)

Z zagotavljanjem kontekstualnih hitrosti uporabnikom cest se lahko izboljša cestna varnost, omogoči podpora za upravljanje prometa in zmanjšajo emisije toplogrednih plinov. V skupnem okolju ITS so kontekstualne hitrosti odvisne od konteksta (npr. vremenskih pogojev) ter dovoljenih hitrosti glede na čas vožnje in cestni odsek. To so lahko predpisane in/ali priporočene omejitve hitrosti, za katere veljajo lokalni predpisi. Ta dokument podrobno določa in opredeljuje »kontekstualne hitrosti«, vključno s primeri uporabe. Določa tudi splošne storitvene zahteve za podporo te funkcije in podaja priporočila za definicijo profilov uporabe.

General Information

Status
Published
Publication Date
22-Mar-2016
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
23-Mar-2016
Completion Date
23-Mar-2016

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SLOVENSKI STANDARD
SIST-TS CEN ISO/TS 17426:2016
01-julij-2016
Inteligentni transportni sistemi - Kooperativni sistemi - Kontekstualne hitrosti
(ISO/TS 17426:2016)
Intelligent transport systems - Cooperative systems - Contextual speeds (ISO/TS
17426:2016)
Intelligente Transportsysteme (ITS) - Kooperative Systeme - Kontextuelle
Geschwindigkeiten (ISO/TS 17426:2016)

Systèmes intelligents de transport - Systèmes coopératifs - Vitesses contextuelles

(ISO/TS 17426:2016)
Ta slovenski standard je istoveten z: CEN ISO/TS 17426:2016
ICS:
03.220.01 Transport na splošno Transport in general
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
SIST-TS CEN ISO/TS 17426:2016 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST-TS CEN ISO/TS 17426:2016
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SIST-TS CEN ISO/TS 17426:2016
CEN ISO/TS 17426
TECHNICAL SPECIFICATION
SPÉCIFICATION TECHNIQUE
March 2016
TECHNISCHE SPEZIFIKATION
ICS 03.220.01; 35.240.60
English Version
Intelligent transport systems - Cooperative systems -
Contextual speeds (ISO/TS 17426:2016)

Systèmes intelligents de transport - Systèmes Intelligente Transportsysteme (ITS) - Kooperative

coopératifs - Vitesses contextuelles (ISO/TS Systeme - Kontextuelle Geschwindigkeiten (ISO/TS

17426:2016) 17426:2016)

This Technical Specification (CEN/TS) was approved by CEN on 25 January 2016 for provisional application.

The period of validity of this CEN/TS is limited initially to three years. After two years the members of CEN will be requested to

submit their comments, particularly on the question whether the CEN/TS can be converted into a European Standard.

CEN members are required to announce the existence of this CEN/TS in the same way as for an EN and to make the CEN/TS

available promptly at national level in an appropriate form. It is permissible to keep conflicting national standards in force (in

parallel to the CEN/TS) until the final decision about the possible conversion of the CEN/TS into an EN is reached.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,

Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels

© 2016 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN ISO/TS 17426:2016 E

worldwide for CEN national Members.
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SIST-TS CEN ISO/TS 17426:2016
CEN ISO/TS 17426:2016 (E)
Contents Page

European foreword ....................................................................................................................................................... 3

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SIST-TS CEN ISO/TS 17426:2016
CEN ISO/TS 17426:2016 (E)
European foreword

This document (CEN ISO/TS 17426:2016) has been prepared by Technical Committee ISO/TC 204

"Intelligent transport systems" in collaboration with Technical Committee CEN/TC 278 “Road transport

and traffic telematics” the secretariat of which is held by NEN.

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

patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent

rights.

This document has been prepared under a mandate given to CENELEC by the European Commission

and the European Free Trade Association.

According to the CEN-CENELEC Internal Regulations, the national standards organizations of the

following countries are bound to announce this Technical Specification: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,

France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,

Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland,

Turkey and the United Kingdom.
Endorsement notice

The text of ISO/TS 17426:2016 has been approved by CEN as CEN ISO/TS 17426:2016 without any

modification.
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SIST-TS CEN ISO/TS 17426:2016
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SIST-TS CEN ISO/TS 17426:2016
TECHNICAL ISO/TS
SPECIFICATION 17426
First edition
2016-03-15
Intelligent transport systems —
Cooperative systems — Contextual
speeds
Systèmes intelligents de transport — Systèmes coopératifs — Vitesses
contextuelles
Reference number
ISO/TS 17426:2016(E)
ISO 2016
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SIST-TS CEN ISO/TS 17426:2016
ISO/TS 17426:2016(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2016, Published in Switzerland

All rights reserved. Unless otherwise specified, 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
Ch. de Blandonnet 8 • CP 401
CH-1214 Vernier, Geneva, Switzerland
Tel. +41 22 749 01 11
Fax +41 22 749 09 47
copyright@iso.org
www.iso.org
ii © ISO 2016 – All rights reserved
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SIST-TS CEN ISO/TS 17426:2016
ISO/TS 17426:2016(E)
Contents Page

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

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

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

2 Conformance ............................................................................................................................................................................................................. 2

3 Normative references ...................................................................................................................................................................................... 2

4 Terms and definitions ..................................................................................................................................................................................... 2

5 Symbols and abbreviated terms ........................................................................................................................................................... 3

6 Contextual Speeds: Architecture .......................................................................................................................................................... 4

7 Contextual speeds: Use cases ................................................................................................................................................................... 5

7.1 General ........................................................................................................................................................................................................... 5

7.2 Use case 1: Provision of mandatory speed limit information into vehicle – for

driver awareness purposes .......................................................................................................................................................... 6

7.3 Use case 2 - Provision of advisory speed information into vehicle – for driver

awareness purposes ........................................................................................................................................................................10

8 Contextual speeds: Roles and responsibilities ...................................................................................................................14

8.1 Scenarios for contextual speeds ............................................................................................................................................14

8.2 System operation roles in scenario 7 ................................................................................................................................15

8.3 Possible actors in the Contextual Speed Information Service .....................................................................15

9 Contextual speeds: Characteristics.................................................................................................................................................16

10 Contextual speeds: General service requirements ........................................................................................................16

11 Contextual speeds: Communication requirements .......................................................................................................17

11.1 General ........................................................................................................................................................................................................17

11.2 General communication requirements ...........................................................................................................................18

11.2.1 General...................................................................................................................................................................................18

11.2.2 ITS-S application processes of the Contextual Speed Application .....................................18

11.2.3 Flow types of the Contextual Speed Application ...............................................................................18

11.2.4 Flow Type 1 of the Contextual Speed Application ...........................................................................19

11.2.5 Flow Type 2 of the Contextual Speed Application ...........................................................................19

11.2.6 Flow Type 3 of the Contextual Speed Application ...........................................................................20

11.2.7 Sources and Sink ITS stations of the Flow Types ..............................................................................21

11.2.8 Other general communication requirements ......................................................................................21

11.3 Application specific data element requirements ....................................................................................................21

Annex A (normative) Contextual speeds: IVI Profile (Definition of CSM) ...................................................................23

Bibliography .............................................................................................................................................................................................................................29

© ISO 2016 – All rights reserved iii
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ISO/TS 17426:2016(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 on the meaning of ISO specific terms and expressions related to conformity

assessment, as well as information about ISO’s adherence to the WTO principles in the Technical

Barriers to Trade (TBT) see the following URL: Foreword - Supplementary information.

The committee responsible for this document is ISO/TC 204, Intelligent transport systems.

iv © ISO 2016 – All rights reserved
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Introduction

Traditional fixed speed limits have, in general, been set as the maximum mandatory speed that a

vehicle or a category of vehicles can travel at. Such speed limits are defined by the competent authority.

Some national authorities moderate mandatory speed limits when road or environment conditions

change. When road or environmental conditions change, the decision as to the most appropriate speed

a driver or rider should travel is, in general, left up to the individual vehicle driver. With the advent of

Cooperative Intelligent Transport Systems (ITS), it has become possible to provide better guidance to

vehicle drivers on what speed they should travel at when road, traffic, or environmental conditions are

less than ideal. This function is known as Contextual Speed Information Service.

Delivering Contextual Speed information to road users can improve road safety, support traffic

management, and reduce greenhouse gas emissions.

In a Cooperative ITS environment, Contextual Speeds are context-dependent (e.g. changed due

to weather conditions), as well as time-specific and road section-specific speeds. Subject to local

regulations, they can be mandatory speed limits or advisory speeds.

All Cooperative ITS Services follow the same abstract structure of detection (of an event) including pre-

processing of the detected content, execution of the Service algorithm (processing of detected content)

and presentation or utilization of the Service result. Figure 1 summarizes and further illustrates this

process.
Content processing
Detection
Info service generation
Info service presentation

Figure 1 — General Cooperative ITS Service process (from ISO/TS 17427:2014, Figure A.6)

Based on this abstract process description, for any Cooperative ITS Service, a similar process description

applies to the Contextual Speed Information Service. Every single step in the process chain can be

executed by different actors or stakeholders. Execution of process elements by different stakeholders

results in a large number of possible potential scenarios. Additionally, the involvement of stakeholders

can be distinguished by spatial geography.

Assuming that there are two main stakeholder groups in Cooperative ITS, namely the Infrastructure

and the Vehicle, multiple combinations are possible, as every step can be delivered by a different

stakeholder group (see Figure 2).
Figure 2 — Possible scenarios — Simple
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The scenarios address different combinations; the basis for every scenario is one specific combination.

This Technical Specification addresses the scenario where detection, content pre-processing, and

information service generation is the responsibility of the infrastructure stakeholder. The direct

presentation of Contextual Speed information on the driver interface of the vehicle is out of the scope

of this Technical Specification. This Technical Specification therefore addresses only part of the whole

process (Scenario 7).

Within the context of Scenario 7, this Technical Specification addresses Use Case 1 “Provision of

mandatory speed limit information into vehicle – for driver awareness purposes” and Use Case 2

“Provision of advisory speed information into vehicle – for driver awareness purposes”.

This does not preclude other Use Cases or deployment models in later Technical Specification(s).

vi © ISO 2016 – All rights reserved
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SIST-TS CEN ISO/TS 17426:2016
TECHNICAL SPECIFICATION ISO/TS 17426:2016(E)
Intelligent transport systems — Cooperative systems —
Contextual speeds
1 Scope
This Technical Specification

— specifies the Contextual Speed Information Service, namely the general requirements regarding the

provision of the Contextual Speed Information Service, the data flow supporting the service, and

the presentation of the service result,

— specifies the requirements to be fulfilled by the Contextual Speed Information Service,

— specifies the ITS Station (ITS-S) application processes of the vehicle ITS station, roadside ITS station,

central ITS station, and personal ITS station that are required to instantiate the Contextual Speed

Information Service,

— specifies sets of communication requirements and objectives (profiles) using the methods defined

in ISO 17423 to select the level of performance (best effort or real-time, etc.), confidence and security

(authentication, encryption, etc.) for each Contextual Speed Information Service communication

flow between ITS stations,

— selects relevant functions and procedures provided by the ITS station facilities layer (see

ISO 17429), and

— specifies messages, messages sets structure, content, and syntax to be used by the Contextual Speed

Information Service.

This Technical Specification considers the scenario for the transmission of Contextual Speed

information from the infrastructure/roadside to the vehicle, for onward presentation to the vehicle’s

driver. This scenario foresees that the calculation of Contextual Speed information is performed on the

Infrastructure side, not within the vehicle.

Mandatory speed limits or advisory speed recommendations are output of the Contextual Speed

Information Service which (in the scenario considered in this Technical Specification) is run by the

Road Operator in its Traffic Control Centre or comparable infrastructure (e.g. Roadside ITS Station). To

transfer this information to the vehicle (and therefore the driver) over the air (wireless communication),

defined messages are required. These messages are specified in this Technical Specification.

When Contextual Speed information arrives in the vehicle, further pre-processing might be necessary

before the Contextual Speed information, and, if available, additional explanations on speed limits

or recommendations, can be presented to the driver. This Technical Specification specifies the

requirements that need to be fulfilled when processing the messages. It does not specify how the vehicle

handles the incoming messages.

The production of information supporting this application, its qualification and its relevance are out of

the scope of this Technical Specification.

This Technical Specification addresses Use Case 1 “Provision of mandatory speed limit information into

vehicle – for driver awareness purposes” and Use Case 2 “Provision of advisory speed information into

vehicle – for driver awareness purposes”.
© ISO 2016 – All rights reserved 1
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ISO/TS 17426:2016(E)
2 Conformance

To claim conformance to this Technical Specification, all mandatory requirements shall be fulfilled by

the implementation under test.

NOTE 1 Conformance testing may be different for different roles/actors. This Technical Specification identifies

the requirements for a number of Protocol Implementation Conformance Statements (PICS) proforma, allowing

to claim conformance to defined subsets of ISO/TS 17426 requirements.

NOTE 2 This Technical Specification adopts the ISO/IEC 9646-7 approach for conformance testing

specifications (i.e. development of PICS proforma, TSS&TP, ATS, and PIXIT).
3 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

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

ISO 21217, Intelligent transport systems — Communications access for land mobiles (CALM) — Architecture

ISO 24102–3, Intelligent transport systems — Communications access for land mobiles (CALM) — ITS

station management — Part 3: Service access points

ISO 24102–6 , Intelligent transport systems — Communications access for land mobiles (CALM) — ITS

station management — Part 6: Path and flow management

ISO/TS 17419, Intelligent transport systems — Cooperative systems — Classification and management of

ITS applications in a global context

ISO/TS 17423, Intelligent transport systems — Cooperative systems — ITS application requirements and

objectives for selection of communication profiles

ISO/TS 17425, Intelligent transport systems — Cooperative systems — Data exchange specification for in-

vehicle presentation of external road and traffic related data

ISO/TS 17427, Intelligent transport systems — Cooperative systems — Roles and responsibilities in the

context of cooperative ITS based on architecture(s) for cooperative systems

ISO/TS 17429 , Intelligent transport systems — Cooperative ITS — ITS station facilities for the transfer of

information between ITS stations

ISO/TS 18750, Intelligent transport systems — Cooperative systems — Definition of a global concept for

Local Dynamic Maps

ISO/TS 19321, Intelligent transport systems — Cooperative ITS — Dictionary of in-vehicle information

(IVI) data structures
4 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 21217, ISO 24102-3, ISO 24102-6,

ISO/TS 17419, ISO/TS 17423, ISO/TS 17425, ISO/TS 17427, ISO/TS 17429 and the following apply.

4.1
advisory speed

speed set by an authority which it considers appropriate to the road, traffic, or environmental conditions

being experienced
1) To be published.
2) To be published.
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4.2
advisory speed information
set of C-ITS data elements related to an advisory speed
4.3
C-ITS authority data set
set of C-ITS data elements describing policies or regulations
4.4
contextual speed

context-dependent (e.g. weather conditions), as well as time-specific and road section-specific speed

Note 1 to entry: Subject to local regulations, a Contextual Speed may be a mandatory speed limit or an

advisory speed.
4.5
contextual speed information
set of C-ITS data elements related to a Contextual Speed
4.6
mandatory speed information
set of C-ITS data elements related to a mandatory speed limit (4.7)
4.7
mandatory speed limit

legally defined, maximum or minimum, speed limit for specific types or classes of vehicles or all vehicles

on a defined section of road
4.8
relevance zone
parts of the road network for which the contextual speed is valid
5 Symbols and abbreviated terms
ADU Application Data Unit
ATS Abstract Test Suite
BSMD Bounded Secured Managed Domain
C-ITS Cooperative ITS
CSM Contextual Speed Message
HMI Human Machine Interface
ICT Information Communications Technologies
ITS Intelligent Transport Systems
ITS-AID ITS Application Identifier
ITS-S ITS Station
ITS-SCU ITS-S Communication Unit
ITS-SU ITS-S Unit
LDM Local Dynamic Map
n.a. not applicable
OEM Original Equipment Manufacturer
PDU Protocol Data Unit
PICS Protocol Implementation Conformance Statement
PIXIT Protocol Implementation eXtra Information for Testing
TSS&TP Test Suite Structure and Test Purposes
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6 Contextual Speeds: Architecture

The architecture of the ITS station (ITS-S) specified in ISO 21217 is illustrated in Figure 3.

Figure 3 — Simplified ITS-S reference architecture (from ISO 21217)

The Contextual Speed Information Service is provided to users by execution of the Contextual Speed

Application. The Contextual Speed Application is an instantiation of the Contextual Speed Information

Service that involves the association of complementary ITS-S application processes.

In order to be able to install and execute these ITS-S application processes in an ITS station unit (ITS-

SU) operated as a Bounded Secured Managed Domain (BSMD) specified in ISO 21217, registration

procedures identified in ISO/TS 17419 shall be applied.

The Contextual Speed Application requires communications between these ITS-S application

processes residing in ITS station units. Such communications include the exchange of Contextual Speed

Messages (CSM).

In order to enable communications between ITS-S application processes residing in different ITS

Station Communication Units (ITS-SCU) prior to transmission of application data units (ADUs), each

ITS-S application process has to register at the ITS-S management and present its communication

requirements as specified in ISO/TS 17423. Required values to be presented for the ITS-S application

processes of the Contextual Speed Application are specified in Clause 11.

Upon this registration and presentation of communication requirements, the ITS-S management will

identify the most appropriate communication profile for each source of data and assign a “FlowID” to it

as specified in ISO 24102-6.

Communications requires features of the ITS-S facilities layer both for transmission and for reception

of ADUs as specified in ISO/TS 17429.

The Contextual Speed Application requires that their related ITS-S application processes provide

received geo-referenced and time-stamped information to a Local Dynamic Map (LDM) specified in

ISO/TS 18750. The LDM is the key element to enable cooperative behaviour in an ITS-SU, i.e. the sharing

of data between applications.
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The Contextual Speed Application requires retrieving LDM data elements either by a subscription

mechanism or by a query mechanism.

The Contextual Speed Application is uniquely identified by the registered “ITS Application Identifier”

(ITS-AID) specified in ISO/TS 17419.

NOTE Contextual Speed Application uses predefined messages from the ITS Message Set as uniquely

identified by the registered “ITS Message Set Identifier” (ITS-MsgSetID) specified in ISO/TS 17419. The values of

ITS-AID and ITS-MsgSetID will be assigned by the respective registration authority. The numbering of messages

in this ITS Message Set is as uniquely defined for this ITS Message Set.
7 Contextual speeds: Use cases
7.1 General

The Contextual Speed Information Service is provided to users by execution of the Contextual Speed

Application. The Contextual Speed Application provides information from a sending ITS station to an

ITS station in a vehicle. The sending ITS station is typically a roadside or a central ITS station. The

ITS station in a vehicle may either be a vehicle ITS station or a personal ITS station. The information

supported by the Contextual Speed Application concerns either static or dynamic advisory speed

guidance or mandatory speed limits. This information is typically provided by road/traffic managers

or authorized service providers to drivers in order to improve the road safety, reduce environmental

impact, and enhance the traffic flow.

NOTE 1 Traditionally, much of this information is available on fixed plate road traffic signs or variable displays

at the roadside or mounted above or to the side of specific lanes.

As an element of the Contextual Speed Information Service is the ability to transfer and use information

from an external environment into the vehicle for subsequent presentation, it is essential that the

service provides stable, robust, and reproducible results given a specified input condition especially in

respect of mandatory speed limits.

Furthermore, some basic safety and legal constraints are necessary, such that advisory speed outputs

shall never exceed the maximum mandatory speed limit (for the vehicle class, driver qualifications and

other legally enforceable conditions that may apply) for defined identifiable sections of road. Similarly,

the
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