EN ISO 14819-1:2021

SLOVENSKI STANDARD
01-junij-2021
Nadomešča:
SIST EN ISO 14819-1:2014
Inteligentni transportni sistemi - Sporočila prometnih in potovalnih informacij prek
kodiranih prometnih sporočil - 1. del: Kodirni protokol za radijski podatkovni
sistem - Prometni informacijski kanal (RDS-TMC), ki uporablja sistem ALERT-C
(ISO 14819-1:2021)
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 14819-1:2021)
Intelligente Transportsysteme - Verkehrs- und Reiseinformationen über
Verkehrsmeldungskodierung - Teil 1: Kodierungsprotokoll für den digitalen Radiokanal
für Verkehrsmeldungen (RDS-TMC) unter Nutzung von ALERT-C (ISO 14819-1:2021)
Systèmes intelligents de transport - Informations sur le trafic et le tourisme via le codage
de messages sur le trafic - Partie 1: Protocole de codage pour le système de
radiodiffusion de données (RDS) - Canal de messages d'informations sur le trafic (RDS-
TMC) avec ALERT-C (ISO 14819-1:2021)
Ta slovenski standard je istoveten z: EN ISO 14819-1:2021
ICS:
03.220.20 Cestni transport Road transport
35.240.60 Uporabniške rešitve IT v IT applications in transport
prometu
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 14819-1
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 03.220.20; 35.240.60 Supersedes EN ISO 14819-1:2013
English Version
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 14819-1:2021)
Systèmes de transport intelligents - Informations sur le Intelligente Transportsysteme - Verkehrs- und
trafic et les déplacements via le codage de messages Reiseinformationen über Verkehrsmeldungskodierung
sur le trafic - Partie 1: Protocole de codage pour le - Teil 1: Kodierungsprotokoll für den digitalen
système de radiodiffusion de données - canal de Radiokanal für Verkehrsmeldungen (RDS-TMC) unter
messages d'informations sur le trafic (RDS-TMC) avec Nutzung von ALERT-C (ISO 14819-1:2021)
Alert-C (ISO 14819-1:2021)
This European Standard was approved by CEN on 30 July 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14819-1:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 14819-1:2021) has been prepared by Technical Committee ISO/TC 204
"Intelligent transport systems" in collaboration with Technical Committee CEN/TC 278 “Intelligent
transport systems” the secretariat of which is held by NEN.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by September 2021, and conflicting national standards
shall be withdrawn at the latest by September 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN ISO 14819-1:2013.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 14819-1:2021 has been approved by CEN as EN ISO 14819-1:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 14819-1
Third edition
2021-03
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
Systèmes de transport intelligents — Informations sur le trafic et les
déplacements via le codage de messages sur le trafic —
Partie 1: Protocole de codage pour le système de radiodiffusion de
données - canal de messages d'informations sur le trafic (RDS-TMC)
avec Alert-C
Reference number
ISO 14819-1:2021(E)
©
ISO 2021
ISO 14819-1:2021(E)
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 14819-1:2021(E)
Contents Page
Foreword .vi
Introduction .vii
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 5
4 Application . 6
4.1 General . 6
4.2 Definition of the TMC "travel service". 6
4.3 TMC virtual terminal . . 7
4.4 Event-orientated end-user information messages . 7
4.5 Strategic and tactical information . 7
4.6 Geographic relevance . 8
4.7 Transmitted message priority . 8
4.8 Event List. 9
4.9 Future extensions . 9
5 Presentation . 9
5.1 General . 9
5.2 TMC virtual language. 9
5.3 Message content .10
5.3.1 General.10
5.3.2 Event description (11 bits) .10
5.3.3 Primary location (16 bits) .10
5.3.4 Direction and extent (4 bits) .11
5.3.5 Duration (3 bits).11
5.3.6 Diversion advice (1 bit) .13
5.4 Implicit information .14
5.4.1 Road class and road number .14
5.4.2 Road segment .14
5.4.3 Area, region and country .14
5.4.4 Pre-assigned diversion advice .14
5.4.5 Urgency within the terminal .14
5.4.6 Directionality .15
5.4.7 Duration type .15
5.4.8 Nature .15
5.4.9 Update class .15
5.4.10 Quantifier type .15
5.5 Optional message content .15
5.5.1 General.15
5.5.2 Combination of additional information .16
5.5.3 Control codes (label 1).16
5.5.4 Length of route affected (label 2) .17
5.5.5 Speed limit (label 3) .17
5.5.6 Additional quantifiers (labels 4 and 5) .17
5.5.7 Supplementary information (label 6) .18
5.5.8 Start and stop times (labels 7 and 8) .18
5.5.9 Multi-event messages (label 9) .18
5.5.10 Detailed diversion instructions (label 10) .19
5.5.11 Destinations (label 11) .19
5.5.12 Precise location reference (label 12).19
5.5.13 Cross linkage to source of problem (label 13) .20
ISO 14819-1:2021(E)
5.5.14 Separator (label 14) .20
5.5.15 Other information as defined by sub-labels (label 15) .21
5.5.16 Reference to telephone services (label 15, sub-label 1-2) .21
6 Message management .24
6.1 General .24
6.2 System messages .25
6.2.1 General.25
6.2.2 Location table .25
6.2.3 Terminal requirements .25
6.2.4 Change of database numbers .26
6.3 Message repetition .26
6.4 Message updating .26
6.5 Message deletion .27
6.5.1 General.27
6.5.2 Message persistence .27
6.5.3 Detailed stop-time .28
6.5.4 Non-silent and silent cancellation messages .28
6.5.5 Null message.28
6.6 Message presentation .29
6.7 Out of area referencing .29
6.7.1 Structure of the INTER-ROAD concept .29
6.7.2 INTER-ROAD messages .30
6.7.3 Updating and cancellation of INTER-ROAD messages .30
7 Transmission using RDS type 8A and type 3A groups .31
7.1 General .31
7.2 Format of type 8A groups .31
7.3 Group repetition .31
7.4 Single-group user messages .32
7.5 System messages .33
7.5.1 General.33
7.5.2 System information .33
8 Method of encrypting an RDS-TMC service .36
8.1 General .36
8.2 Summary of TMC data elements in type 3A groups .37
8.3 Summary of TMC data elements in type 8A groups .37
8.4 Principles of the Encryption and Conditional Access methodology .37
8.5 Encryption by the service provider .38
8.6 Use of type 8A groups for RDS-TMC encryption .38
8.7 Encryption Administration group .39
8.7.1 General.39
8.7.2 Service identifier (SID) .39
8.7.3 Encryption identifier (ENCID) .39
8.7.4 Location table number before encryption (LTNBE) .40
8.7.5 Test Bits .40
8.8 Encrypting location codes .40
8.8.1 General.40
8.8.2 Test mode .41
8.8.3 Repetition rate .41
8.9 Access to decrypted services by a terminal .42
8.10 ‘Activation’ of a terminal.42
8.10.1 General.42
8.10.2 Serial number of terminal .42
8.10.3 Access profile (ACP) .43
8.10.4 PIN code composition . .43
8.10.5 Implementation rules for PIN codes .43
8.11 Identifying an encrypted RDS-TMC service .43
8.12 Decrypting location codes .44
iv © ISO 2021 – All rights reserved

ISO 14819-1:2021(E)
8.13 Alternative encryption strategy .45
9 Following an RDS-TMC service .45
9.1 General .45
9.2 System information repetition rates .46
9.3 Tuning information .46
9.3.1 General.46
9.3.2 Format of the Tuning Information .46
9.3.3 Conditions for using tuning information .48
9.3.4 Repetition rate .49
9.4 Multi-group messages . .49
9.4.1 General.49
9.4.2 First group .50
9.4.3 Subsequent groups .51
9.5 Summary of X-bit usage in RDS-TMC type 8A groups .52
Bibliography .54
ISO 14819-1:2021(E)
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, 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 14819-1:2013), which has been
technically revised. The main changes compared to the previous edition are as follows:
— Additional tuning variants have been added to allow referencing of TMC services using the 64 MHz
to 88 MHz band.
— The method of encrypting an RDS-TMC service, previously separately specified in ISO 14819-6,
has been merged into this document as Clause 8. Consequently, some renumbering of sections has
occurred and encryption-specific terms, definitions and abbreviated terms have been added in
Clause 3.
— In some places the text has been improved and/or rearranged for greater clarity. Several
typographical and grammatical errors have been corrected.
A list of all parts in the ISO 14819 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.
vi © ISO 2021 – All rights reserved

ISO 14819-1:2021(E)
Introduction
0.1 General
Traffic and traveller information (TTI) can be disseminated through a number of services and means of
communication to the end user, including static displays (e.g. variable message signs), broadcast audio
to car radios, broadcast data services to in-vehicle equipment (e.g. installed navigation systems) and to
nomadic device terminals (e.g. portable navigation device).
For all such services, the data to be disseminated and the message structure involved in the various
interfaces require clear definition and standard formats, in order to allow competitive products to
operate with any received data.
This document describes the data specification for TTI messages, together with their network layer and
their service layer, which shall be conveyed by the RDS-TMC feature, specified in the IEC 62106 series.
The TTI information chain, from event to end-user, is quite complex and the Traveller Information
Services Association (TISA) value chain shown in Figure 1 helps to explain the key components.
Figure 1 — Traveller Information Services Association TTI value chain
Several entities (e.g. companies, businesses) take part in one or more activities to complete the activities
shown in the value chain. These are described below for improved understanding:
Service provider: An organization that constructs a data service, by gathering data, processing
data and supplying the data service. A service provider negotiates for the use of the necessary data
bandwidth with a Broadcaster and/or Transmission Operator. A service provider is responsible for the
"quality" of the data to its customers and should provide suitable customer support.
Broadcaster: A traditionally incorporated organization responsible for a continuous strand of audio
programmes and their quality. A broadcaster may also be responsible for the overall co-ordination of
"broadcast transmissions" (often a Broadcaster is the licensee of a national regulator). A Broadcaster
may also be a service provider.
TTI services for travellers, using spoken radio reports and in-vision reports, occupy broadcast air-time
and whilst valuable to some, they are considered less useful by others. Furthermore, only some are
useful for travellers on the move. Due to the widespread adoption of the Radio Data System, in VHF/
FM broadcasting on Band II there is the possibility of transmitting coded TTI messages digitally and
"silently" using the RDS-TMC feature, which avoids the interruption of planned programmes. This TTI
delivery method has several advantages: TTI messages can be decoded into the language of the end
user, regardless of location, more messages can be made available and planned broadcast programme
interruption is avoided. Thus, using RDS-TMC makes the delivery of TTI messages more timely and
topical.
0.2 ALERT-C protocol
The ALERT-C protocol defined in this document supports a data broadcasting service for travellers,
providing information about many kinds of traffic and travel events. Messages include traffic incident
information relating to national and regional routes and some urban roads and other information
required by a traveller, such as roadworks and weather information.
The ALERT-C protocol utilizes a standardized Event List of event messages with their code values, which
also includes general traffic problems and weather situations. Being transmitted as a series of codes,
RDS-TMC messages are language-independent and are presented in the language of the user's choice.
ISO 14819-1:2021(E)
ALERT-C defines two categories of information within messages: basic and optional items. In principle,
basic information is present in all messages. Optional information is added to messages where
necessary.
Standard RDS-TMC user messages provide the following five basic items of explicit, broadcast
information:
1. Event description, giving details of road event situation, general traffic problems and weather
situations (e.g. congestion caused by an accident) and where appropriate its severity (e.g. resulting
queue length).
2. Location, indicating the area, road segment or point location where the source of the problem is
situated.
3. Direction and extent, identifying the adjacent segments or specific point locations also affected
by the incident, and where appropriate the direction of traffic affected.
4. Duration, giving an indication of how long the problem is expected to last.
5. Diversion advice, showing whether end-users are recommended to find and follow an
alternative route.
Optional information may be added to any message using one or more additional RDS data groups. This
optional addition may give greater detail or deal with unusual situations. Any number of additional
fields can in principle be added to each basic message, subject only to a maximum message length of
five RDS data groups.
0.3 Document development and RDS groups
This document is based on the ALERT-C traffic message coding protocol, which was a product of DRIVE
Project V1029, "RDS Advice and Problem Location for European Road Traffic". The RDS-ALERT project
aimed to define standards for RDS-TMC, working in conjunction with the European Broadcasting Union
(EBU) and the European Conference of Ministers of Transport (ECMT).
The document has been implemented in many countries worldwide and, after very extensive
implementation experience, it has matured with many changes compared to the earliest version of the
ALERT-C proposal of 1990. At that time, CEN TC 278 Working Groups developed the coding protocol
described in this document, the Event List described in ISO 14819-2 and the location referencing
method described in ISO 14819-3. Subsequently the TMC Forum was responsible for collecting specific
additions and improvements intended for inclusion in this document. In 2008, TISA took over all
responsibility (including TMC Forum legacy) for maintenance of this document, which now includes an
up to date set of industry supported enhancements to RDS-TMC.
The RDS is fully described in IEC 62106 and it contains the 'hooks' to RDS-TMC detailed in this
1)
document ; it employs a group-structured data protocol. Terminal Device manufacturers should be
aware that service providers broadcast the following RDS groups:
a) type 3A groups, which carry the TMC Open Data Application (ODA) identification and service and
network layer information, identifying TMC services uniquely worldwide;
b) type 8A groups, which carry RDS-TMC messages and location information, together with TMC
service tuning information; and
c) type 4A groups, which contain the Clock Time (CT) information that is used as the time reference
within TMC.
1) In this document, many "hooks" have been left for future development and indeed a few status-orientated road
end-user information messages are included.
viii © ISO 2021 – All rights reserved

ISO 14819-1:2021(E)
Additionally, where necessary, the following group may also be transmitted:
d) type 0A groups, which contain Alternative Frequency (AF) information, that is used as an
alternative to, or in addition to, tuning information carried in the type 8A group.
It is noted that although the ‘message’ information carried within the 8A group will be transmitted once
with either one or two ‘immediate’ repeats (see 7.3), the encryption administration information and
the tuning information, both also transmitted in type 8A groups, usually will not be transmitted with
an ‘immediate’ repeat: this information is largely ‘static’ and repeated periodically only every several
seconds or minutes. Terminal Devices therefore process every RDS group received that passes their
CRC and use the data contained within once it has been verified by the reception of a second identical
group, regardless of whether received ‘immediately’ or after several seconds or minutes.
Broadly speaking, two types of RDS-TMC services are in use: one that is broadcast without access
control, and one that is broadcast with access control. The method of ‘access control’ was designed
in 2000 and was published separately in ISO 14819-6. It described how a service provider encrypted
their service and the complementary process to be adopted by terminals to decrypt the service
by arrangement with the service provider. It also indicated a strategy to be followed to introduce
encrypted services between 2001 and 2003, when encryption was expected to become widespread. As
encrypted RDS-TMC services are now widespread, the details in ISO 14819-6 have now been merged
within this document and consequently ISO 14819-6 has been withdrawn.
INTERNATIONAL STANDARD ISO 14819-1:2021(E)
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
1 Scope
The ALERT-C protocol is designed to provide mostly event-oriented road end-user information
messages.
This document specifies the messages which are presented to the user in accordance with a set of
general requirements. It defines the message structure and content and its presentation to the end-user.
The message management component of this document describes the message management functions
of RDS-TMC. The ALERT-C protocol distinguishes between user messages and system messages. User
messages are those potentially made known to the end-user, as defined in Clause 5. System messages
are of use only to the RDS-TMC terminal, for message management purposes.
RDS-TMC information comprises both ‘system information’ and ‘user messages’. System information
relates to the TMC service and details the parameters that the terminal needs to be able to find,
identify and decode the TMC information. System information is transmitted in type 3A groups and in
type 8A groups.
User messages contain the details of the traffic events; these may use one or more type 8A groups. Most
messages may be transmitted using a single type 8A group, however messages with more detail (e.g.
diversion advice) may use up to a total of five, type 8A groups.
The transmission component of this document conveys the messages over-air. The ALERT-C protocol,
used by RDS-TMC, has the fundamental approach of aiming to code most messages entirely within a
single RDS group.
The ALERT-C Event List, which contains all event descriptions, is described in ISO 14819-2.
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 4217, Codes for the representation of currencies
IEC 62106 (all parts), Radio data system (RDS) — VHF/FM sound broadcasting in the frequency range
...