ISO/TS 24315-3
(Main)Intelligent transport systems — Management of electronic traffic regulations (METR) — Part 3: System of systems requirements and architecture (SoSR)
Intelligent transport systems — Management of electronic traffic regulations (METR) — Part 3: System of systems requirements and architecture (SoSR)
The management of electronic transport regulations (METR) provides trustworthy, authoritative, machine-interpretable, transport-related rules for using the road network. The scope of METR includes both rules that are relatively static (e.g., static speed limits) as well as those that are dynamic (e.g., variable speed limits, lane closures at incident scenes). However, where appropriate, METR is expected to incorporate existing standards (e.g., ISO/TS 19091 for signalized intersections). This document defines the end-to-end requirements for entire METR system of systems (SoS), which is called the METR network. The requirements are provided in a format that is consistent with the guidance provided by ISO 29148 [2] for a system requirements document.
Systèmes de transport intelligents — Gestion des règles de circulation sous forme électronique — Partie 3: Exigences et architecture pour le système des systèmes
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Technical
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ISO/DTS 24315-3
ISO/TC 204
Intelligent transport systems —
Secretariat: ANSI
Management of electronic traffic
Voting begins on:
regulations (METR) —
2025-06-09
Part 3:
Voting terminates on:
2025-09-01
System of systems requirements
and architecture (SoSR)
Systèmes de transport intelligents — Gestion des règles de
circulation sous forme électronique —
Partie 3: Exigences et architecture pour le système des systèmes
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TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
Reference number
ISO/DTS 24315-3:2025(en) © ISO 2025
FINAL DRAFT
ISO/DTS 24315-3:2025(en)
Technical
Specification
ISO/DTS 24315-3
ISO/TC 204
Intelligent transport systems —
Secretariat: ANSI
Management of electronic traffic
Voting begins on:
regulations (METR) —
Part 3:
Voting terminates on:
System of systems requirements
and architecture (SoSR)
Systèmes de transport intelligents — Gestion des règles de
circulation sous forme électronique —
Partie 3: Exigences et architecture pour le système des systèmes
RECIPIENTS OF THIS DRAFT ARE INVITED TO SUBMIT,
WITH THEIR COMMENTS, NOTIFICATION OF ANY
RELEVANT PATENT RIGHTS OF WHICH THEY ARE AWARE
AND TO PROVIDE SUPPOR TING DOCUMENTATION.
© ISO 2025
IN ADDITION TO THEIR EVALUATION AS
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/CEN PARALLEL PROCESSING
LOGICAL, COMMERCIAL AND USER PURPOSES, DRAFT
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
INTERNATIONAL STANDARDS MAY ON OCCASION HAVE
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
TO BE CONSIDERED IN THE LIGHT OF THEIR POTENTIAL
or ISO’s member body in the country of the requester.
TO BECOME STAN DARDS TO WHICH REFERENCE MAY BE
MADE IN NATIONAL REGULATIONS.
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 Reference number
ISO/DTS 24315-3:2025(en) © ISO 2025
ii
ISO/DTS 24315-3:2025(en)
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 1
5 Overview . 2
5.1 METR purpose .2
5.2 METR scope .3
5.3 METR overview .3
5.3.1 Functional view .3
5.3.2 Physical view .4
5.4 Assumptions and dependencies .8
5.4.1 Assumptions .8
5.4.2 Dependencies .9
5.5 Traceability conventions.9
5.6 Naming conventions .11
5.7 Traceability and conformance .11
6 System of systems requirements .11
6.1 General .11
6.2 Input requirements . 12
6.2.1 Information flow: legal rules . 12
6.2.2 Information flow: coordination . 12
6.2.3 Information flow: discrepancy information . 13
6.2.4 Information flow: traffic control devices (TCD) status .14
6.3 Output requirements . 15
6.3.1 Information flow: audit information . 15
6.3.2 Information flow: coordination .16
6.3.3 Information flow: information.16
6.3.4 Information flow: information for adaptation .18
6.4 Functional requirements . . 20
6.4.1 Verification of METR rules . 20
6.4.2 METR information storage requirements . 20
6.5 Applicable intelligent transport system (ITS) station unit requirements .21
6.5.1 Support services .21
6.5.2 Timeliness . 23
6.5.3 Filtering . 23
6.5.4 Open specification . 23
6.5.5 Backwards compatibility .24
6.5.6 Forward compatibility .24
6.5.7 Language neutral .24
6.6 Information requirements .24
6.6.1 General .24
6.6.2 Feature catalogue .24
6.6.3 METR information .24
6.6.4 Information content . 25
6.6.5 Information meta-data . 26
6.6.6 Observable transport rule attributes . 26
6.6.7 Additional transport rule attributes .27
6.6.8 Auditing attributes . 28
6.7 Efficient exchange constraint . 28
7 Actor responsibilities .28
iii
ISO/DTS 24315-3:2025(en)
7.1 Rule maker responsibilities . 28
7.1.1 Maintain rules . 28
7.1.2 Define location accurately . 28
7.2 User responsibilities . 28
7.2.1 Acquire rules before travelling. 28
7.2.2 Identify necessary rule criteria . 28
7.2.3 Obtain necessary supporting data . 28
7.2.4 Process rules . 29
7.2.5 Identify discrepancies . 29
7.2.6 Mapping .
...
ISO/DTS 24315-3:####(CD)
ISO/TC 204/WG 19
Secretariat: ANSI
Date: 2025-02-0705-26
Intelligent transport systems — Management of electronic traffic
regulations (METR) — —
Part 3:
System of systems requirements and architecture (SoSR)
DTS stage
Warning for WDs and CDs
This document is not an ISO International Standard. It is distributed for review and comment. It is subject to
change without notice and may not be referred to as an International Standard.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of
which they are aware and to provide supporting documentation.
© ISO #### – All rights reserved
ISO 24315-3:####(CD)
Systèmes de transport intelligents — Gestion des règles de circulation sous forme électronique —
Partie 3: Exigences et architecture pour le système des systèmes
2 © ISO #### – All rights reserved
CD Draft ISO/DTS 24315-3:####(CD:(en)
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
EmailE-mail: copyright@iso.org
Website: www.iso.orgwww.iso.org
Published in Switzerland
© ISO ####2025 – All rights reserved
iii
ISO/DTS 24315-3:####(CD) CD Draft :(en)
Contents
Foreword . vi
Introduction . vii
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Abbreviated terms . 2
5 Overview . 3
5.1 METR purpose . 3
5.2 METR scope . 3
5.3 METR overview . 4
5.4 Assumptions and dependencies . 10
5.5 Traceability conventions . 11
5.6 Naming conventions . 13
5.7 Traceability and conformance . 13
6 System of systems requirements . 13
6.1 General . 13
6.2 Input requirements . 14
6.3 Output requirements . 17
6.4 Functional requirements . 23
6.5 Applicable intelligent transport system (ITS) station unit requirements . 24
6.6 Information requirements . 27
6.7 Efficient exchange constraint . 31
7 Actor responsibilities . 31
7.1 Rule maker responsibilities . 31
7.2 User responsibilities . 31
7.3 Implementer responsibilities . 32
7.4 Auditor responsibilities . 32
8 System-level reference architecture . 32
8.1 Overview . 32
8.2 Physical view . 33
8.3 Enterprise view . 65
9 Variables . 82
9.1 General . 82
9.2 catalogueUpdateInterval. 82
9.3 criteriaLatencyTime . 82
9.4 distributionResponseTime. 82
9.5 informationRefreshDuration . 82
9.6 metrRecoveryTime . 82
9.7 metrResponseTime . 82
9.8 metrUpdateCycle . 82
9.9 metrUpTimePercent . 82
9.10 provisionLatency . 83
9.11 subscriptionRefreshTime . 83
9.12 translationUpdateInterval. 83
Annex A (informative) Conformance . 84
Annex B (normative) Diagram conventions . 87
© ISO #### 2025 – All rights reserved
iv
CD Draft ISO/DTS 24315-3:####(CD:(en)
Annex C (informative) Possible deployments of role-based architecture . 92
Bibliography . 102
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ISO/DTS 24315-3:####(CD) CD Draft :(en)
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 documentsdocument 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 drawnISO draws attention to the possibility that some of the elementsimplementation of this
document may beinvolve the subjectuse of (a) patent(s). ISO takes no position concerning the evidence,
validity or applicability of any claimed patent rights in respect thereof. As of the date of publication of this
document, ISO had not received notice of (a) patent(s) which may be required to implement this document.
However, implementers are cautioned that this may not represent the latest information, which may be
obtained from the patent database available at www.iso.org/patents. 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 ).
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 CEN/TC
278, Intelligent Transport Systems, in accordance with the Agreement on technical cooperation between ISO
and CEN (Vienna Agreement).
This is the first edition of ISO 24315-3.
A list of all parts in the ISO 24315 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.
© ISO #### 2025 – All rights reserved
vi
CD Draft ISO/DTS 24315-3:####(CD:(en)
Introduction
0.1 System overview
The ISO 24315 series on the management of electronic traffic regulations (METR) is intended to provide users
access to geo-specific, trustworthy, timely, authoritative, machine-interpretable, traffic and transport related
rules enacted by jurisdictional entities, including those who define rules for campuses (i.e., private grounds).
This is conceptually shown in Figure 0-1.
Figure 0-1: — METR concept
0.1.1 Purpose
METR is designed to assist developers and manufacturers of driving automation systems (i.e., automation
Levels 1- to 5) and driver information systems (including those at automation Level 0) to electronically obtain
traffic rules to better enable:
a) interacting safely with other road users;
b) following instructions from law enforcement organizations, and those authorized to direct traffic;
c) maintaining smooth and safe flow of traffic; and
d) complying with other rules enacted to support legislative policies (such as environmental protection,
noise, manage height and weight restrictions, and societal aspects such as market days, fiestas, pedestrian
[1 ]
zones, etc.). .). [1]
METR is designed to provide a reference framework for the trustworthy distribution of electronic versions of
legal traffic rules, however content and application of the traffic rules is outside of the scope of the METR
standards and specifications.
0.1.2 Flow of information
The general flow of METR information is illustrated in Figure 0-2 and subsequently described.
© ISO ####2025 – All rights reserved
vii
ISO/DTS 24315-3:####(CD) CD Draft :(en)
Key
a METR starts with rule makers defining and enacting rules that are relevant to transport users.
b Each legal rule is translated into a METR rule, which is a secure, standardized electronic representation that includes a
digital signature of the rule signing organization.
c METR rules are collected for a geographic area(s) and specific scope(s).
d Rules are distributed to MET
...
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