ISO 14819-3-2021 PDF

Full title and description

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. This part specifies rules and data structures for referencing locations when encoding traffic and travel information for delivery over RDS‑TMC and compatible short-message TTI carriers using the ALERT‑C scheme.

Abstract

ISO 14819‑3:2021 defines location‑referencing rules and formats to support compact, interoperable coding of location information in Traffic and Travel Information (TTI) messages carried by RDS‑TMC (ALERT‑C). The document supports use of abbreviated coding formats for mobile carriers and exchange protocols (for example RDS‑TMC over FM and integration with data exchange frameworks such as DATEX II) to enable consistent encoding, decoding and interpretation of point and linear locations across providers and terminals.

General information

• Status: Published.
• Publication date: 2021‑02 (Edition 3, 2021).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 03.220.20, 35.240.60.
• Edition / version: 3 (third edition).
• Number of pages: 69 pages (official ISO edition).

Scope

Specifies rules for location referencing intended to meet the specific requirements of Traffic Message Channel (TMC) systems that use compact (abbreviated) coding formats for distributing traffic and travel information (TTI) via mobile carriers (e.g., RDS‑TMC over FM, DAB, GSM) or via exchange protocols such as DATEX II. The scope includes definition of reference types, table structures and procedures required to encode point, linear and area locations and to support interoperable decoding by TMC receivers using the ALERT‑C protocol.

Key topics and requirements

• ALERT‑C location‑referencing model and required message elements for RDS‑TMC.
• Definition and management of location tables (codes for points, linear segments, junctions and auxiliary objects).
• Rules for encoding offsets, directions, lengths and areas to represent linear and point locations compactly.
• Interoperability and backward‑compatibility considerations with previous editions and legacy RDS‑TMC deployments.
• Guidance for using location referencing with other carriers and data exchange frameworks (e.g., integration considerations for DATEX II).

Typical use and users

Used by traffic information providers, TMC encoders and broadcasters, navigation system and in‑vehicle system manufacturers, traffic management authorities, and data exchange platform implementers who need standardized compact location referencing for RDS‑TMC/ALERT‑C messaging and for interfacing TMC content with other TTI services.

Related standards

Part of the ISO 14819 series; closely related documents include ISO 14819‑1 (Coding protocol for RDS‑TMC using ALERT‑C) and ISO 14819‑2 (Event and information codes / ALERT‑C event list), both revised in the 2021 cycle. Regional/adopted versions include EN ISO 14819‑3 and various national adoptions. These companion parts cover message structure and event coding that work together with the location referencing rules in Part 3.

Keywords

RDS‑TMC, ALERT‑C, location referencing, traffic message coding, traffic and travel information, TTI, location table, DATEX II, intelligent transport systems.

FAQ

Q: What is this standard?

A: ISO 14819‑3:2021 is the third‑edition international standard that defines location referencing rules and formats for encoding locations in RDS‑TMC traffic messages using the ALERT‑C scheme.

Q: What does it cover?

A: It specifies how to represent point, linear and area locations in compact encoded form for use in TMC systems (RDS‑TMC and similar carriers), including location table structures, offset rules and interoperability guidance.

Q: Who typically uses it?

A: Traffic information providers, RDS‑TMC encoders and broadcasters, navigation/IVI system vendors, traffic authorities and implementers of data exchange services that integrate TMC messages.

Q: Is it current or superseded?

A: Current (published). ISO 14819‑3:2021 is the active third edition and replaces the 2013 edition.

Q: Is it part of a series?

A: Yes — it is Part 3 of the ISO 14819 series (Parts 1 and 2 address the ALERT‑C coding protocol and the Events List respectively). The three parts together define the ALERT‑C based RDS‑TMC message coding framework.

Q: What are the key keywords?

A: RDS‑TMC, ALERT‑C, location referencing, TTI (traffic and travel information), location table, DATEX II, ITS.