ISO/TS 20684-10:2021
(Main)Intelligent transport systems — Roadside modules SNMP data interface — Part 10: Variable message signs
Intelligent transport systems — Roadside modules SNMP data interface — Part 10: Variable message signs
Variable message signs (VMSs) are installed in areas where traffic managers identify a frequent need to convey information to the travelling public, such as upstream from interchanges to alert the public to downstream congestion in time for them to alter their routes. This allows traffic managers to improve the efficiency, safety, and quality of traveller journeys. In order to manage the operation of a VMS and the messages displayed, information exchange between the management systems and the VMS is needed. This document identifies basic user needs for the management of light-emitting diode (LED) matrix VMSs and traces these needs to interoperable designs. This includes the ability to identify the device, its capabilities, and its status. NOTE 1 This document is similar to portions of NTCIP 1203 v03, which defines how to manage VMSs using an older version of SNMP and is a normative reference in this document. NOTE 2 ISO 20684-1 provides additional details about how this series of standards relates to the overall ITS architecture.
Systèmes de transport intelligents — Interface de données SNMP pour les modules en bord de route — Partie 10: Panneaux à messages variables
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TECHNICAL ISO/TS
SPECIFICATION 20684-10
First edition
2021-04
Intelligent transport systems —
Roadside modules SNMP data
interface —
Part 10:
Variable message signs
Systèmes de transport intelligents — Interface de données SNMP pour
les modules en bord de route —
Partie 10: Panneaux à messages variables
Reference number
©
ISO 2021
© 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
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Conformance . 3
6 Physical architecture . 6
7 User needs . 6
7.1 Manage the control mode of the VMS. 6
7.2 Manage the sign display . 7
7.3 Monitor the sign display doors . 7
7.4 Monitor the sign display mains power . 7
7.5 Monitor the sign display power supplies . 7
8 Requirements . 7
8.1 Message sign control mode . 7
8.1.1 Message sign control mode definition . 7
8.1.2 Message sign control mode data exchange requirements . 7
8.1.3 Message sign control mode capabilities . 8
8.2 Message library . 8
8.2.1 Message library definition . 8
8.2.2 Message library data exchange requirements . 8
8.2.3 Message library capabilities.10
8.3 Sign display .12
8.3.1 Sign display definition . .12
8.3.2 Sign display data exchange requirements.12
8.4 Sign display doors .14
8.4.1 Sign display doors definition .14
8.4.2 Sign display doors data exchange requirements . .14
8.4.3 Sign display door capability requirements .14
8.4.4 Sign display door design constraints .14
8.5 Sign display mains power .14
8.5.1 Sign display mains power definition .14
8.5.2 Sign display mains power data exchange requirements .14
8.5.3 Sign display mains power capability requirements .14
8.5.4 Sign display mains power design constraints .14
8.6 Sign display power supplies .15
8.6.1 Sign display power supplies definition .15
8.6.2 Sign display power supplies exchange requirements .15
8.6.3 Sign display power supplies capability requirements .15
8.6.4 Sign display power supplies design constraints .15
8.7 Sign display light sensors .15
8.7.1 Sign display light sensors definition .15
8.7.2 Sign display light sensors exchange requirements .15
8.7.3 Sign display light sensors capability requirements .15
8.7.4 Sign display light sensors design constraints .16
8.8 Sign display pixels .16
8.8.1 Sign display pixels definition .16
8.8.2 Sign display pixels data exchange requirements .16
8.8.3 Sign display pixels capability .16
Annex A (normative) Management Information Base .17
Annex B (normative) Requirements Traceability Matrix .21
Annex C (informative) Relationship to NTCIP 1203 .26
Bibliography .27
iv © ISO 2021 – All rights reserved
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.
A list of all parts in the ISO 20684 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.
Introduction
0.1 Background
A variable message sign (hereinafter referred to as a “VMS”) is an electronic traffic sign installed on
the roadside to provide real-time traffic information to travellers, thereby improving their efficiency
in the utilization of road traffic, and is a major physical component of the intelligent transport system
(hereinafter referred to as “ITS”) which supplies the system with information for improvement of the
safety on the road.
More VMSs are expected to be installed and operated due to an increase in demand for establishment of
ITS and for replacement of existing VMSs which have exceeded their durability terms.
The operator of the traffic management centre needs real time data exchange between a VMS and the
centre to supply information to the VMS in real time and to control and manage the VMS.
However, no standards for the information transmitted and received between the traffic management
centre and the VMSs have been established, leading to the development of various protocols and their
application to each VMS construction project. As a result, a variety of problems have arisen, including
redundant investment in development costs and forced dependence on the protocol of the previous
operator when replacing the existing VMSs with new ones.
This document therefore defines the data items (messages), formats and communication protocols
(Application, Presentation, Session, and Transport layers) required to ensure the interoperability of the
information transmitted and received between the VMS and the traffic management centre, thereby
ensuring interoperability between the VMS and the centre.
0.2 Overview
This document defines the message, the data elements making up the message, and the application
layer profile for message transmission in order to ensure the interoperability between the
...
TECHNICAL ISO/TS
SPECIFICATION 20684-10
First edition
2021-04
Intelligent transport systems —
Roadside modules SNMP data
interface —
Part 10:
Variable message signs
Systèmes de transport intelligents — Interface de données SNMP pour
les modules en bord de route —
Partie 10: Panneaux à messages variables
Reference number
©
ISO 2021
© 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
Contents Page
Foreword .v
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 2
5 Conformance . 3
6 Physical architecture . 6
7 User needs . 6
7.1 Manage the control mode of the VMS. 6
7.2 Manage the sign display . 7
7.3 Monitor the sign display doors . 7
7.4 Monitor the sign display mains power . 7
7.5 Monitor the sign display power supplies . 7
8 Requirements . 7
8.1 Message sign control mode . 7
8.1.1 Message sign control mode definition . 7
8.1.2 Message sign control mode data exchange requirements . 7
8.1.3 Message sign control mode capabilities . 8
8.2 Message library . 8
8.2.1 Message library definition . 8
8.2.2 Message library data exchange requirements . 8
8.2.3 Message library capabilities.10
8.3 Sign display .12
8.3.1 Sign display definition . .12
8.3.2 Sign display data exchange requirements.12
8.4 Sign display doors .14
8.4.1 Sign display doors definition .14
8.4.2 Sign display doors data exchange requirements . .14
8.4.3 Sign display door capability requirements .14
8.4.4 Sign display door design constraints .14
8.5 Sign display mains power .14
8.5.1 Sign display mains power definition .14
8.5.2 Sign display mains power data exchange requirements .14
8.5.3 Sign display mains power capability requirements .14
8.5.4 Sign display mains power design constraints .14
8.6 Sign display power supplies .15
8.6.1 Sign display power supplies definition .15
8.6.2 Sign display power supplies exchange requirements .15
8.6.3 Sign display power supplies capability requirements .15
8.6.4 Sign display power supplies design constraints .15
8.7 Sign display light sensors .15
8.7.1 Sign display light sensors definition .15
8.7.2 Sign display light sensors exchange requirements .15
8.7.3 Sign display light sensors capability requirements .15
8.7.4 Sign display light sensors design constraints .16
8.8 Sign display pixels .16
8.8.1 Sign display pixels definition .16
8.8.2 Sign display pixels data exchange requirements .16
8.8.3 Sign display pixels capability .16
Annex A (normative) Management Information Base .17
Annex B (normative) Requirements Traceability Matrix .21
Annex C (informative) Relationship to NTCIP 1203 .26
Bibliography .27
iv © ISO 2021 – All rights reserved
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.
A list of all parts in the ISO 20684 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.
Introduction
0.1 Background
A variable message sign (hereinafter referred to as a “VMS”) is an electronic traffic sign installed on
the roadside to provide real-time traffic information to travellers, thereby improving their efficiency
in the utilization of road traffic, and is a major physical component of the intelligent transport system
(hereinafter referred to as “ITS”) which supplies the system with information for improvement of the
safety on the road.
More VMSs are expected to be installed and operated due to an increase in demand for establishment of
ITS and for replacement of existing VMSs which have exceeded their durability terms.
The operator of the traffic management centre needs real time data exchange between a VMS and the
centre to supply information to the VMS in real time and to control and manage the VMS.
However, no standards for the information transmitted and received between the traffic management
centre and the VMSs have been established, leading to the development of various protocols and their
application to each VMS construction project. As a result, a variety of problems have arisen, including
redundant investment in development costs and forced dependence on the protocol of the previous
operator when replacing the existing VMSs with new ones.
This document therefore defines the data items (messages), formats and communication protocols
(Application, Presentation, Session, and Transport layers) required to ensure the interoperability of the
information transmitted and received between the VMS and the traffic management centre, thereby
ensuring interoperability between the VMS and the centre.
0.2 Overview
This document defines the message, the data elements making up the message, and the application
layer profile for message transmission in order to ensure the interoperability between the
...
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