ISO/TS 18234-8:2012

TECHNICAL ISO/TS
SPECIFICATION 18234-8
First edition
10-01-2012
Intelligent transport systems — Traffic
and travel information via transport
protocol experts group, generation 1
(TPEG1) binary data format —
Part 8:
Congestion and Travel Time
application (TPEG1-CTT)
Systèmes intelligents de transport — Informations sur le trafic et le
tourisme via les données de format binaire du groupe d’experts du
protocole de transport, génération 1 (TPEG1) —
Partie 8: Application bouchons et temps de voyage (TPEG1-CTT)
Reference number
©
ISO 2012
© ISO 2012
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ii © ISO 2012 – All rights reserved

Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Conformance . 1
3 Normative references . 1
4 Terms and definitions . 1
5 Abbreviated terms . 3
6 Definitions . 5
6.1 General . 5
6.2 Message Management . 5
6.3 Locations - Abbreviation: Loc . 5
7 CTT Application Overview . 6
7.1 Introduction . 6
7.2 TPEG-Message Concept . 7
7.3 Elements of TPEG Congestion and Travel Time . 8
7.4 Message Management . 8
7.5 Status Description . 9
7.6 Location Referencing . 9
8 CTT Container .10
8.1 Structure of CTT Message .10
8.2 CTT Application Component Frame .10
9 Message Management Container .11
9.1 Mandatory Elements .11
9.2 Date and Time Elements .11
9.3 Coding of Message Management Container .12
10 Status Container .13
10.1 Status Description .13
10.2 Coding of CTT Information Container.13
11 TPEG CTT Tables .16
11.1 Congestion Type Table .16
11.2 Congestion Tendency Table .16
Annex A (informative) Conversion formulae .18
Bibliography .20
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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International
Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies
casting a vote.
In other circumstances, particularly when there is an urgent market requirement for such documents, a
technical committee may decide to publish other types of document:
— an ISO Publicly Available Specification (ISO/PAS) represents an agreement between technical
experts in an ISO working group and is accepted for publication if it is approved by more than 50 % of
the members of the parent committee casting a vote;
— an ISO Technical Specification (ISO/TS) represents an agreement between the members of
a technical committee and is accepted for publication if it is approved by 2/3 of the members of the
committee casting a vote.
An ISO/PAS or ISO/TS is reviewed after three years in order to decide whether it will be confirmed for
a further three years, revised to become an International Standard, or withdrawn. If the ISO/PAS or
ISO/TS is confirmed, it is reviewed again after a further three years, at which time it must either be
transformed into an International Standard or be withdrawn.
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.
ISO/TS 18234-8 was prepared by Technical Committee ISO/TC 204, Intelligent transport systems.
ISO/TS 18234 consists of the following parts, under the general title Intelligent transport systems — Traffic
and travel information via transport protocol experts group, generation 1 (TPEG1) binary data format:
— Part 1: Introduction, numbering and versions (TPEG1-INV)
— Part 2: Syntax, Semantics and Framing Structure (SSF)
— Part 3: Service and Network Information (SNI) application
— Part 4: Road Traffic Message (RTM) application
— Part 5: Public Transport Information (PTI) application
— Part 6: Location referencing applications
1)
— Part 7: Parking Information (TPEG1-PKI)
— Part 8: Congestion and travel time application (TPEG1-CTT)
2)
— Part 9: Traffic event compact (TPEG1-TEC)
1) To be published.
2) To be published.
iv © ISO 2012 – All rights reserved

3)
— Part 10: Conditional access information (TPEG1-CAI)
4)
— Part 11: Location Referencing Container (TPEG1-LRC)
3) To be published.
4) To be published.
Introduction
TPEG technology uses a byte-oriented stream format, which may be carried on almost any digital bearer
with an appropriate adaptation layer. TPEG-messages are delivered from service providers to end-users,
and are used to transfer application data from the database of a service provider to a user’s equipment.
This Technical Specification describes the Congestion and Travel Time application in detail.
TPEG1-CTT is one of several applications required to provide a fully comprehensive traffic and travel
information service, for example a service is likely to need public transport information, parking
information and weather information. These are or will be the subject of other TPEG-application
specifications.
TPEG1-CTT has been derived from earlier work, named “idio” via the FM data broadcasting system,
DARC. The “idio” is the TTI service which was officially launched starting in 2001 all over South Korea.
The TPEG1-CTT has become the most popular service of the many applications of DMB, after being tested
and proven via both the terrestrial and satellite DMB (Digital Multimedia Broadcasting) networks.
The Broadcast Management Committee of the European Broadcast Union (EBU) established the
B/TPEG project group in autumn 1997 with the mandate to develop, as soon as possible, a new protocol
for broadcasting traffic and travel-related information in the multimedia environment. The TPEG
technology, its applications and service features are designed to enable travel-related messages to be
coded, decoded, filtered and understood by humans (visually and/or audibly in the user’s language) and
by agent systems.
One year later in December 1998, the B/TPEG group produced its first public specifications. Two
documents were released. ISO/TS 18234-2,TPEG-SSF, describes the syntax, semantics and framing
structure which are used for all TPEG applications. ISO/TS 18234-4, TPEG-RTM describes the first
application for Road Traffic Messages.
ISO/TC 204/WG 10, established a project group comprising the members of B/TPEG and they have
continued the work concurrently since March 1999. Since then two further parts have been developed
to make the initial complete set of four parts, enabling the implementation of a consistent service.
ISO/TS 18234-3, TPEG-SNI describes the Service and Network Information Application, which is likely
to be used by all service implementations to ensure appropriate referencing from one service source
to another. ISO/TS 18234-1, TPEG-INV, completed the work, by describing the other parts and their
relationships; it also contains the application IDs used within the other parts.
In April 2000, the B/TPEG group released revised Parts 1 to 4, which had all been reviewed and updated
in light of the initial implementation results. Thus, a consistent suite of specifications, ready for wide-
scale implementation, was submitted to the ISO commenting process.
In November 2001, after extensive response to the comments received and from many internally
suggested improvements, all four parts were completed for the next stage: the Parallel Formal Vote. But
a major step forward has been to develop the so-called TPEG-Loc location referencing method, which
enables both map-based TPEG-decoders and non map-based ones to deliver either map-based location
referencing or human readable information. ISO/TS 18234-6, TPEG-Loc, is now a separate specification
and is
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