ISO 14819-3:2021 Intelligent transport systems — Traffic and travel information messages via traffic message coding —Part 3: Location referencing for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

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Intelligent transport systems — Traffic and travel information messages via traffic message coding —Part 3: Location referencing for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C是国际标准化组织发布的ISO标准，适用于全球。

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标准部分原文

Intelligent transport systems — Traffic and travel information messages via traffic message coding —

Part 3: Location referencing for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

1 Scope

This document specifies location referencing rules to address the specific requirements of Traffic Message Channel (TMC) systems, which use abbreviated coding formats to provide traffic and travel information (TTI) messages over mobile bearers (e.g. GMS, DAB) or via exchange protocols like DATEX II. In particular, the rules address the Radio Data System-Traffic Message Channel (RDS-TMC), a means of providing digitally-coded TTI to travellers using a silent data channel on FM radio stations, based on the ALERT-C protocol.

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.

ISO 639-1, Codes for the representation of names of languages — Part 1: Alpha-2 code

ISO 14819-1, Intelligent transport systems — Traffic and travel information messages via traffic message coding — Part 1: Coding protocol for Radio Data System-Traffic Message Channel (RDS-TMC) using ALERT-C

ISO 15924, Information and documentation — Codes for the representation of names of scripts

3 Terms, definitions and abbreviated terms

No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https://w ww. iso. org/ obp

— IEC Electropedia: available at http:// www .electropedia. org/ For the purposes of this document, the following abbreviated terms apply:

ALERT-C Advice and Problem Location for European Road Traffic, Version C

ASCII American Standard Code for Information Interchange

CCD country code

CID country identifier

CLST code of location subtype

CNAME country name

ECC extended country code

EDIFACT Electronic data interchange for administration commerce and transport

GDF geographic data files (for modelling and exchange of geographic data for transport telematics applications)

LC location code

LTCC location table country code

LTN location table number

POI point of interest

RDS radio data system (digital information channel on FM sub carrier)

TIC traffic information centre

TISA Traveller Information Services Association

TMC traffic message channel

TTI traffic and travel information

WGS84 World Geodetic System 1984

4 Location coding

4.1 General

Location references used by RDS-TMC are covered by the location referencing rules defined in this subclause. The ALERT-C coding protocol for RDS-TMC is defined in ISO 14819-1.

ALERT-C supports a digital, silent data broadcast service for motorists, providing information about many kinds of traffic situations. This includes roadwork, weather and traffic incident information relating to major national and international roads, regional roads and local or urban roads.

4.2 Location tables

4.2.1 General

Within RDS-TMC, locations are identified and referenced by their location code. A given RDS-TMC service uses a pre-defined location table, containing the pre-stored details of the locations that can be referenced in messages from that service.

A location code in such a message refers and serves as a tabular ‘address’ of the pre-stored location details in the location table used by the service. A real-world location may have more than one location code within the same location table. However, within a given location table, each location code refers to one and only one location. A location code has a number in the range 1 to 63 487.

In ALERT-C, a further 2048 numbers shall be reserved for INTER-ROAD (see ISO 14819-1) and other forms of referencing.

A table may contain a maximum number of 65 536 codes allocated in the following way:

Location code Use

0 reserved

1 - 63,487 free for normal location coding

63,488 - 64,511 for special purposes

64,512 - 65,532 for INTER-ROAD

64,533 - 65,535 special functions

NOTE INTER-ROAD is a coding mechanism within ALERT-C to reference in a specific type of ALERT-C message (the INTER-ROAD message) a location belonging to a different location table. The INTER-ROAD location can be a table in the same country as well as a table in another country.

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