Traffic Message Channel

Traffic Message Channel

Traffic Message Channel (TMC) is a technology for delivering traffic and travel information to drivers. It is typically digitally coded using the FM-RDS system on conventional FM radio broadcasts. It can also be transmitted on DAB or satellite radio.It allows silent delivery of high quality accurate, timely and relevant information, in the language chosen by the user and without interrupting normal services.Services, both public and commercial, are now operational in many European countries.When data is integrated directly into a navigation system, this gives the driver the option to take alternative routes to avoid traffic incidents.

How it works

Each traffic incident is sent as a TMC message. One message consists of an event code and a location code in addition to time details.

The message is coded according to the "Alert C" standard. It contains a list of max 2048 events (1402 pr 01.02.2007) which can be translated by a TMC receiver into the language of the user.

Location code tables are maintained on a national level and assign numbers to locations on the road network. Those location tables are integrated in the maps provided by NAVTEQ and Tele Atlas.

The source of traffic information is typically police, traffic cameras, loops, floating car data and others.


TMC-Forum is a non-profit organization. The members are service providers, receiver manufactures, car manufactures, map vendors, broadcasters (public and private), automobile clubs, public authorities and others.It is a forum to discuss traffic information related aspects. Furthermore it maintains the TMC-Standard (ISO 14819).On 11th November 2007 the TMC-Forum and the TPEG-Forum has merged into TISA (Traveller Information Services Association). TISA has taken over all TMC-Forum activities.


In April 2007 research about RDS-TMC was [ presented] at the [ CanSecWest] security conference by two Italian security researchers.

The presentation, titled Unusual Car Navigation Tricks, raised the point that RDS-TMC is a wireless cleartext protocol and showed how to build a receiver and transmitter with cheap electronics, capable of injecting false and potentially dangerous messages.

Detailed instructions and schematics have also been posted on Issue #64 of Phrack hacking magazine.

TMC services in operation

The following countries provide a TMC service:


[ Intelematics Australia] has commenced broadcasting a national RDS-TMC service focused initially on the Australian capital cities (only available in Melbourne, Sydney and Brisbane currently), under the consumer brand 'SUNA Traffic Channel'. The service is transmitted by a national commercial FM broadcaster.
[ Sentinel Content Pty Limited] provides a TMC Service service for Sydney, Melbourne and Brisbane and is delivered using webservices and GPRS rather than RDS. It currently provides greater coverage than others and while it does not broadcast an RDS service it does provide navigation vendors with web based traffic services.


In Austria, ORF is broadcasting the free service on the radio channels Ö1, "Ö2" (9 regional channels), "Ö3", "Radio Salzburg" and FM4 and is supported by the "Federal Ministry for Traffic, Innovation and Technology (BMVIT)". "ASFINAG" is responsible for the location table, currently in version 2.1, in which a lot of new codes have been added for the Euro2008 championship. In total, around 8.000 location codes are present in this table.

Baltic region

Destia Traffic starts broadcasting traffic information in the Baltic region soon.


In Belgium there are 4 TMC services: "TIC-VL", "BEL TMC" and "4FMTMC" in Flanders and RTBF in Wallonia. All of them are currently open services.

The service "TIC-VL" is broadcast by VRT on "Radio 2" and is using content from the "Vlaams Verkeerscentrum" [] . Coverage of content and transmissions is limited to the Flanders region.

In the southern part of Belgium, Wallonia, the service "CLASS.21" is broadcast by RTBF on "Classic 21". The service is from the "Centre PEREX" of the "Ministère de l’Équipement et des Transports (MET)" in collaboration with "TMC4U". Both coverage of transmissions and content is limited to Wallonia.

A third TMC service is "4FMTMC" provided by "Vialis", which is also operating TMC services in the Netherlands. It is broadcast by 4FM in Flanders, but the content contains both the content from the "Vlaams Verkeerscentrum" and "PEREX" and so covers Belgium in total. In future they plan to add information on speed cameras.

The commercial PAYTMC service "BEL TMC" provided by "Be-Mobile" in collaboration with Proximus and "Touring Mobilis" is mainly based on Floating Car Data. It is broadcast by VRT on Studio Brussel.

"Tritel" creates the location tables by order of the regional communities. Since December 2004 the broadcast messages are according to location table version 1.4b, in which N-roads are added. The latest, currently used, version is 2.3 (from July 2008).

Czech Republic

In the Czech Republic, two services are available. They are in full operation from 1/2006.

A first service, called "DIC PRAHA", is available in Prague. It is broadcast on Český Rozhlas " – Regina" (92.6 MHz). The service provider is "TSK-PRAHA" (Communication Technical Administration). The content comes from the traffic centre in Prague ("TIC Praha") and consists of closures and restrictions and levels of service in Prague.

A second service, provided by "Teleasist" together with "Global Assistance" is available countrywide, however is not as detailed as DIC Praha in specific areas. It is broadcasted by CRo1 Radiozurnal

TMC developments are coordinated by "CEDA". They are responsible for the location table (current version is 2.41, containing around 6.600 codes).


The free TMC service "DK-TMC" in Denmark is operated by "Vejdirektoratet" or "DRD" (Danish Road Directorate). It is broadcasted on DR "P1", "P2", "P3" and "P4".

They are also responsible for the location tables. Since October 2003 version 6.0 of the location database is transmitted, but already a backwards compatible version 7.0 has been certified by the TMC Forum in June 2004. In case of changes they will transmit both the old and the new location code. Nowadays, version 9.0 is used in Denmark which contains around 2.450 problem locations.

Destia starting to broadcast the TMC service in Denmark, according agreements.


The commercial serivce in Finland is provided by [ Destia] . The service covers biggest cities and roads 1-999. These areas cover the whole country. TMC messages are broadcasted nationally on YLE Radio Suomi channel. Destia uses several information sources to validate traffic data including induction loops, traffic cameras, radio stations, road users and several other partnership companies. The service is encrypted, based on the encryption specifications made by the TMC Forum.

The location table is provided by [ FINNRA] , the Finnish Road Administration. The newest location table is version number 1.42 and it is used by Destia’s TMC service. This version of the table contains around 8.100 problem locations.


Both a free public service and a commercial service are available in France.

The free service is provided by the motorway operators and provides information on their toll-roads. The toll-road operators are "AREA", "ASF", "ATMB", "Cofiroute", "ESCOTA", "SANEF", "SAPN", "SAPRR", "SFTRF" and "SMTPC". The TMC data is on the 107.7 traffic channel so it can only be received along the motorways.

The commercial service "V-Trafic" is provided by "Mediamobile". It is a partnership between TDF, Renault, "Trafficmaster" and "Cofiroute". The service, which replaces the previous "Visionaute" service, is transmitted on the frequencies of "France Inter" and can be received nationally. It includes the information from the motorways but also on Paris congestion. The service was first open but it is now a pay-service, but it is not encrypted: by using a different location table number they can restrict the use. This method is "TMC Forum" 's Interim encryption method. They have about 60000 customers.

Next to that a service from "ViaMichelin" and "Carte Blanche" is provided, transmitted by the "Towercast" network ("NRJ" group). In September 2005 PSA Peugeot Citroën signed a partnership with "ViaMichelin" for the use of this info in their navigation systems.

Location tables are released by the government agency "SETRA" and includes about 20000 locations. Since version 0.4 it includes both inside Paris and outside Paris. The latest certified version is 7.1 for France (containing around 13.500 problem locations) and 0.0 for Andorra (containing 62 problem locations).


In Germany both a public and a commercial service are available. The public service is an open, free service that can be received by the public radio stations.

The other service "TMCpro" is a pay service provided by "T-Systems Traffic", a wholly owned subsidiary of T-Systems. The service went live at the beginning of 2005 across Germany. The content is provided by "ddg Gesellschaft für Verkehrsdaten mbh", a wholly owned subsidiary of "T-Systems Traffic GmbH". It is an encrypted service, based on the conditional access specifications made by the "TMC Forum".

"BAST", the German Federal Highway Research Institute, is releasing location tables. In version 5.1 all major access roads leading to the football arenas which were used in the World Championship in 2006 were added. The current version is 7.01, which contains around 33.000 location codes.


Public service available from 2008-08-01 in Budapest and from 2008-08-20 in the rest of the country. The current version of the location table is 1.0 .


A private service has been announced by Sam Road, the Iranian company which provides an Automotive navigation system. The service will initially be available only for Sam Road customers. However they have stated an intention for the service become publicly available before 2012.


A public RDS-TMC service free of charge is available in Italy from 1 July 1998. "CCISS" (National Traffic Information Centre) is providing the service. It is broadcast on the RAI FM network, on "Radio 1"; this service covers only the Northern Italy, from Turin to Venice.

Another TMC service is provided by the commercial radio station RTL in cooperation with InfoBlu, transmitted on the national radio station RTL 102.5. This service is available as Premium Service so you have to use a software enabled receiver. The service covers 90% of the population of Italy, and is still increasing.

The Italian location table, provided by RAI-CCISS, is in its version 2.1 with around 12.500 codes.

The Netherlands

The service provider "TMC4U" is delivering a TMC service in The Netherlands. Currently it is free, but they plan a pay-service including local information. "TMC4U" is a collaboration between "Siemens" and "ANWB". The transmissions are on the radio channels of "SkyRadio", "Radio Veronica", "Radio 1" and "Radio 3".

A second TMC service "ViaTMC" is provided by "Vialis". They are transmitting on the FM channels of "Q-music" (previously "Radio Noordzee"), "BNR Nieuwsradio" and "Radio 538". Information of traffic jams, road works and so on is the same on both channels, but they add information on speed traps to it independent of each other.

Radio 2 is also sending out TMC-messages, working with data from Vialis.

Location tables come from "AVV Transport Research Centre" and are supplied by "TIC Nederland". The current version is 6.1 which has additions for parking areas / parking lots compared to the 'old' 2003.a version.


Norway does not yet have a TMC-service available. In 2003 there was an experiment with distributing TMC-messages in a limited area (Østfold, Akershus and Oslo). A private actor might start a commercial service during 2008. In June Destia starts to broadcast the TMC service in Norway.

"Statens Vegvesen", the "Norwegian Public Roads Administration (NPRA)", is releasing location tables. The current version is 2.0, containing around 4.600 locations.


A TMC service is available in Spain on "RNE 3". It is provided by
* SCT as the operator of traffic management in Catalonia Autonomous Community
* DT in the Basque Country Autonomous Community
* DGT (Traffic General Directorate) as the operator for the rest of the country's traffic management.The road network coverage is the motorways, national roads and first level roads that belong to the Autonomous Communities. Next to that, RACC [] is working on urban TMC services, starting with Seville and Barcelona. This will broadcast on "RNE 2".

Location tables are coming from "DGT", "Dirección General de Tráfico". The current version is 2.1 and contains about 7.750 problem locations.


A free service is available in Sweden. "SRA", the "Swedish Road Administration" or "Vägverket", is responsible for the free service and for making the location tables. The previous version 1.2003 contained about 9800 locations. Since October 2004 version 1.1.2004 is transmitted. After that version 1.2005 and 2.0.2006 were used. Nowadays version 2.1 is in use for broadcasting TMC messages, which contains more than 5000 changes / additions to version 2.0. Version 2.1 adds a lot of new location codes for more 'secondary' roads. New versions are always backward compatible.

Regarding the transmission, Sweden is divided into 8 broadcasting zones in order not to transmit traffic information that is not useful at that location. They cover the European, national and major county highways and contain information about traffic accidents, road works and road weather.The service is broadcasted on Sveriges Radio P3 radio station and covers 98 percent of Sweden.

The free service will be canceled before 2012, depending on how updates of old devices will be solved.Destia starts to broadcast a pay TMC service in Sweden after the 1 of oct 2008 which will be encrypted,together with the free TMC service.


A TMC service is available in Switzerland. The broadcaster is SRG SSR idée suisse or "Swiss Broadcasting Corporation" who transmits TMC on "FM chain 1" (general, services) and "FM chain 3" (pop/rock) all over Switzerland.
* In German speaking areas: DRS 1 (G) / DRS 3 (G) / RSR 1 (F) / RSI 1 (I) partly
* In French speaking areas: RSR 1 (F) / RSR 3 (F) / DRS 1 (G) / RSI 1 (I) partly
* In Italian speaking areas: RSI 1 (I) / RSI 3 (I) / DRS 1 (G) / RSR 1 (F)It is "Viasuisse", a daughter company of it, that operates the service.

Location codes are the responsibility of the "Swiss Federal Roads Authority FEDRO" but "B+S Ingenieur (Bundesamt fur Strassen)" makes the location tables. Version 5.5 is the latest version, containing around 10.000 codes, and is backwards compatible.

United Kingdom

The private company " [ iTIS Holdings] " provides a commercial TMC service "iTMC" in the United Kingdom. It is broadcast nationally on Classic FM. The price of the service can be included in the price of the car or of the navigation system. This system uses traffic data collected from sensors installed on fleet vehicles known as a Floating Vehicle Data system consisting of approximately 50,000 vehicles. Eddie Stobart haulage have this system installed within 750 vehicles, AA Patrol 3,800, and National Express 530.

"RAC Live" operated by "RAC Trafficmaster Telematics" (RTT) a 50-50 joint venture between RAC Motoring Services and "Trafficmaster" also operates a national service. It uses 3 commercial radio broadcasters, GWR, Capital radio and Chrysalis who together ensure reception across mainland Britain. This system uses a road side infrastructure to measures a vehicle's travel time between sensors placed a few miles apart, and uses number plate recognition technology.

Both providers are responsible for their own location tables. The current location table version of "ITIS" is 5.1. The current location table version of "Trafficmaster" is 3.1 .

Within the United Kingdom TMC services are only offered as pay services. As such they are currently always carried by commercial radio stations rather than by the BBC, a public service broadcaster. The BBC is required by its charter to be free from both political and commercial influence and is therefore unable to carry a pay service unavailable to all.

United States of America and Canada

In the United States of America, XM Satellite Radio started transmitting TMC messages all over the US already whereas Sirius Satellite Radio announced it. Also Clear Channel and Tele Atlas have a TMC service, using FM-RDS in 77 US cities and three Canadian metropolitan areas. [cite press release
title = Traffic Data Goes High Def with Clear Channel Radio
publisher = Clear Channel Radio
date = 2007-07-09
url =
accessdate = 2008-04-14

Other planned services

It is also planned in Portugal and Hungary (test broadcast to be [ expected] for the second-half of 2008). In Ireland and Luxembourg no service is currently planned. In Poland a private radio station did some tests but "General Directorate for National Roads and Motorways" (GDDKIA) didn't decide yet on a real implementation. In Dubai the location table version 1.2 has been certified. In Turkey it is planned but not in usage yet.

In China they are currently investigating on which technology their traffic information system will be based. The main choice is between the Japanese system VICS and the European "TMC". A TMC Location table version 1.0 has been certified already.


See also

* Intelligent transportation system

External links

** [ TISA New Official Website of the TMC and TPEG Forum successor]
** [ TMC Forum]
** [ RDS-TMC Standards]
** [ RDS: "The Radio Data System", "The Broadcasters Guide to RDS"]
** [ SBD Whitepaper: Best practice recommendations for implementing RDS TMC services]
** [ TMC: What is it all about?]
** [ Map and overview of TMC-transmitters in Europe]
** [ Injecting Traffic Information Signals]
** [ TMC Service Germany (public service) technical data]
** [ TMC Service TMCpro Germany (T-mobile Traffic)]
** [ Frequencies ORF]
** [ TMC Service Switzerland: B+S Ingenieur]
** [ TMC Service Switzerland Viasuisse website]
** [ TMC Service Belgium (Flanders)]
** [ Frequencies Radio 2 (Flanders)]
** [ TMC Service Belgium (Wallonia)]
** [ Frequencies Classic 21]
** [ TMC Service Sweden]
*The Netherlands
** [ TMC Service Netherlands - ANWB]
** [ TMC Service Netherlands - Vialis]
** [ TMC4U]
** [ TMC Service France – V-Traffic Mediamobile]
** [ Frequencies France Inter]
** [ ViaMichelin/PSA partnership]
** [ TMC Service Spain - DGT]
** [ - Barcelona]
** [ Sevilla]
** [ TMC Service Denmark]
** [ Frequencies P3]
** [ Frequencies P4]
** [ TMC Service Nordic and Baltic countries - Destia Traffic]
** [ TMC Service Finland - Destia]
** [ TMC Service Finland]
** [ Tiehallinto TMC]
** [ TMC Service Italy RAI]
** [ TMC Service Italy RTL]
** [ TMC Service Norway]
** [ TMC Service UK ITIS]
** [ TMC Service UK TrafficMaster]
** [ Classic FM Transmitter Listings]
** [ ITIS Public Forum]
* Czech Republic
** [ Presentation on TMC in Czech Republic]
** [ RDS-TMC website Czech Republic]

Wikimedia Foundation. 2010.

Игры ⚽ Поможем сделать НИР

Look at other dictionaries:

  • Traffic Message Channel — Traffic Message Channel, ou TMC, est une norme européenne qui permet de diffuser des informations de circulation aux automobilistes, généralement via le système RDS de la radio FM. Cependant, il peut aussi transiter par d autres moyens de… …   Wikipédia en Français

  • Traffic Message Channel — Traffic Message Channel,   RDS …   Universal-Lexikon

  • Traffic Message Channel — Содержание 1 Как это работает 2 Безопасность 3 Действующие службы передачи дорожной …   Википедия

  • Traffic Message Channel — Das Logo des TMC Dienstes Über Traffic Message Channel (TMC) werden Verkehrsbeeinträchtigungen im nichthörbaren Bereich des UKW Signals in digitaler Form gesendet. Moderne Navigationssysteme können Staumeldungen über TMC empfangen und damit… …   Deutsch Wikipedia

  • Traffic-Message-Channel — Traf|fic Mes|sage Chan|nel 〈[træ̣fık mɛ̣sıdʒ tʃæ̣nəl] m.; Gen.: s, Pl.: s〉 Verkehrsfunkkanal, der an bestimmte Empfangssysteme gekoppelt ist [Etym.: <engl. traffic »Verkehr« + message »Mitteilung, Nachricht« + channel »Kanal, Programm«] …   Lexikalische Deutsches Wörterbuch

  • Traffic-Message-Channel — Traf|fic Mes|sage Chan|nel [ træfik mɛsidʒtʃænl] der; s, s <zu engl. traffic »Verkehr«, message »Mitteilung, Nachricht« u. channel »Kanal«> Kanal (3) für den Verkehrsfunk, auf dem bestimmte Informationen, z. B. über Fahrrouten u. Staus,… …   Das große Fremdwörterbuch

  • Traffic congestion — Traffic jam redirects here. For other uses, see Traffic jam (disambiguation). Traffic congestion on Marginal Pinheiros, near downtown São Paulo. According to Time magazine, São Paulo has the world s worst traffic jams.[1 …   Wikipedia

  • Traffic Information Memory — Traffic Information Memo (TIM; auch Traffic Information Memory) ist ein System zur Speicherung von Verkehrsmeldungen in Autoradios. Inhaltsverzeichnis 1 Funktion 2 Geräte 3 Siehe auch 4 Quelle // …   Deutsch Wikipedia

  • Traffic Announcement — (TA) refers to the broadcasting of a specific type of traffic report on the Radio Data System. It is generally used by motorists, to assist with route planning, and for the avoidance of traffic congestion.The RDS enabled receiver can be set to… …   Wikipedia

  • Traffic Information Memo — (TIM; auch Traffic Information Memory) ist ein System zur Speicherung von Verkehrsmeldungen in Autoradios. Inhaltsverzeichnis 1 Funktion 2 Geräte 3 Siehe auch 4 Quelle …   Deutsch Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”