ISO 14819-2:2021 高度道路交通システム—交通メッセージコーディングによる交通および旅行情報メッセージ—パート2：無線データシステムのイベントおよび情報コード-ALERT-Cを使用した交通メッセージチャネル（RDS-TMC） | ページ 2

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 ).

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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 14819-2:2013) which has been technically revised. The main changes compared to the previous edition are as follows:

• the Event List, the column “P” for ‘phased-out codes’ has been added;
• a small number of additional events have been added to the Event List;
• a small number of additional events have been added to the Supplementary List;
• wording has been improved for greater clarity;
• several minor typographical errors have been corrected.

A list of all parts in the ISO 14819 series can be found on the ISO website.

Introduction

This document is the second part of the ISO 14819 series of standards, covering the ‘ALERT-C’ protocol which describes how traffic messages are coded for transmission as an ‘Open Data Application’ over the Radio Data System (RDS), a sub-carrier on FM radio transmissions. A complete understanding of RDS-TMC is only possible by reading this document (Part 2) together with the other parts of the ISO 14819 series of standards, which are:

• ISO 14819-1, which describes the ALERT-C protocol concept and relationship with the RDS standards, IEC 62106 (all parts);
• ISO 14819-3, which describes ways in which position and places are coded using ALERT-C; and
• ISO 14819-6, which describes how messages may be optionally encrypted for conditional access.

This document contains the special meta-language which technical experts agreed would be the sole source for all coded descriptions used in RDS-TMC. This methodology has allowed agreement over important details for the many hundreds of event phrases so included, even though subtle linguistic differences were perceived and allowed for in terms of end-user presentation.

1 Scope

ISO 14819-1 describes the ALERT-C protocol concept and message structure used to achieve densely coded messages to be carried in the RDS-TMC feature. This document specifies the ‘Events List’ to be used in coding those messages.

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.

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:

Bibliography