Traffic Message Channel

About Traffic Message Channel ( TMC) traffic disruption in the inaudible range of the FM signal are transmitted in digital form. Modern navigation systems can receive traffic reports via TMC and thus create routes to bypass traffic jams and obstacles ( dynamic route guidance ).

To use TMC TMC -enabled radio receiver is necessary. Typically, there are those in vehicle navigation systems. There are also car radios, decouple the TMC data via an interface ( TMC -out ), without having to decode itself. Further processing of these data can then be performed in a connected (eg, portable ) navigation system.

The broadcasting of TMC takes place now in many European countries by numerous radio stations. However, the quality of the reports is very different.

Usually TMC services are free to receive ( freeTMC ). In some countries, there are also additional paid TMC services ( PayTMC ) that promise a better quality of traffic information. PayTMC is either broadcast encrypted or uses its own "Location Table" ( "LT", see below).

4.1 Belgium
4.2 China
4.3 Denmark
4.4 Germany 4.4.1 German TMC station
4.4.2 German Navteq Traffic transmitter

4.18.1 TMC in planning
4.18.2 No TMC service in planning
4.18.3 TMC in test phase

Principle of operation

Each transport impairment is sent as a separate TMC message. A TMC message consists of an event code and a location code, possibly an additional limitation in time (decay time ). After elimination of a fault, this fault message is canceled by another TMC message. If this is not received (eg, because the recipient has now removed from the reception range of the transmitter ), the error message is alternatively deleted by the recipient upon reaching the expiry period.

RDS - TMC messages are bit / s transfer with about 60, which corresponds to about 10 per minute.

The message is after the Alert C standard (ISO 14819 ) coded. This includes a list of about 1460 events. Using this list, the message can be translated into a form understandable to the user.

Position codes

The assignment of a position code ( Location Code ) to a geographic location via lists ( Location Table, LT ). These are not subject to international management. Each country will award the position codes for individual road sections itself in some countries even more such lists from different vendors exist in parallel. Because of the maximum data length of 64,000 positions can be coded, which makes TMC relatively inaccurate. Therefore it is not possible in Germany to encode all road sections or intersections.

Swell

Source of the traffic information are typically the police, traffic cameras, stationary measuring cross sections ( inductive loops, IR / radar sensors) or floating car data.

TMC Forum

The TMC Forum was a non-profit organization whose membership is comprised of service providers, terminal equipment, automotive and card makers, public institutions, broadcasters and other organizations. The TMC Forum sees itself both as a platform for discussion on the topic of traffic information in general, on the other hand, it maintains the TMC standard (ISO 14819 ) and further develop. On 11 November 2007, the TMC Forum, together with the TPEG Forum in the Traveller Information Services Association, TISA short, risen. The tasks of the TMC Forum will be continued by TISA. While TMC describes a protocol, the Transport Protocol Experts Group ( TPEG ) is concerned with the specification of protocol families. The TISA certified submitted by the countries Location Tables ( LT) after examination on the basis of clearly defined validation rules.

Security

The TMC protocol does not own encryption methods, as the impact of an attack were classified as rather insignificant. The manipulation described by Heise Security requires a mobile station that is broadcasting on the same frequency as the legal radio stations. The operation of such a transmitter is illegal in most countries, and the technical and financial effort is high.

Countries with TMC services

In the following, an overview of the TMC activities of various countries.

Belgium

A free TMC service, TIC -VL is available in the area of Flanders. Offers sent by Verkeerscentrum Antwerp and VRT on Radio 2.

In the southern part of Belgium, a free TMC service is tested, Wallonia. Aired by RTBF on Classic 21 The service is a service of Centre PEREX of the Ministère de l' Équipement et des Transports ( MET ) in collaboration with TMC4U.

Since 2009 there is also a statewide CA -TMC providers (Be -Mobile ).

Tritel created the LT at the direction of regional communities. Since mid- 2007, the TMC messages are broadcast by the LT version 2.1a, the N- roads are included in the LT. A LT version 2.2 has been certified.

China

Two TMC services there since 2008 in Beijing. Be received at least within the 5th ring road.

CenNavi sends with PI - C000 ( frequency = 91.5, PS - Name = " 106.1 " )

AutoNavi sends with PI code C001 ( frequency = 90.0, PS - Name = " BJ90.0 " )

Audi has its Gen 3 navigation systems for AutoNavi services released on September 12.

Both providers are planning to cover China first but the coastal metropolis. The goal is to offer for 2010 Shanghai.

In Guangzhou, there is since 2008 a traffic information based on the GPS movement data of 17,000 taxis. The system - built and operated by Siemens - reached the road users through SMS and other ways via China Mobile. Other cities and regions are in preparation.

Denmark

A free TMC service DK -TMC is operated in Denmark by the Vejdirektoratet or DRD (Danish Road Directorate ). Aired on the channels P3 and P4 by Danmarks Radio.

It is also responsible for the LT. Since spring 2007, the LT is sent with the version 8.0, the backward-compatible to previous version.

Germany

In Germany free TMC services and since January 2005, the commercial service Navteq Traffic (formerly TMCpro FM) are available. The free TMC service can be received over several radio stations of the ARD broadcasting network and the FM station of Radio Germany ( Germany radio ). NAVTEQ Traffic utilizes many channels of private and local radio stations.

The Federal Highway Research Institute ( Federal Highway Research Institute ) published the LT ( = Location Table, also called " Location Code List " or LCL called ) that were compiled by each state authorities and organizations. The LCL is updated every year in Germany. Since 9 April 2013, the LCL 12.0 is the valid version of the Location Code List ( LCL) and 4:01 the valid version of the Event Code List ( ECL). Compared to the previous version 2,508 changes were made, added 656 locations and 126 deleted, so now 46 395 locations are included. The previous version 11.0 was valid from 17 April 2012 to April 7, 2013.

The Location Code List is made up of area locations ( Area code, eg cities), linear locations ( linear codes, eg roads ) and point locations ( Point Locations, eg parking, connection points ) together. While on motorways and many main roads of all relevant points are shown in the LCL, it is in the downstream road network still large gaps between detected points. A comprehensive collection of all nodes on less important roads is not possible due to technical limitations.

In version changes make all broadcasters, hotlines and other organizations, as simultaneously as possible to the new LCL and ECL to. In principle, the same would also have to be updated all recipients. In practice, however, this often draws on for months. The information content can be falsified in not yet converted by receivers (easy).

German TMC station

Public broadcaster with TMC signal: Bayerischer Rundfunk Bavaria 1
Bavaria 2
Bayern 3
BR -Klassik
B5 aktuell

MDR Jump
MDR 1 Radio Sachsen
MDR Sachsen -Anhalt
MDR Thüringen
Sorbian radio

NDR 1 Niedersachsen
NDR 1 Radio MV
NDR 1 Welle Nord
NDR 90.3
NDR 2
NDR Info
N -Joy

Bremen Eins
Bremen Vier
Nordwestradio

88acht
Antenne Brandenburg
Fritz
Info Radio
Radio One

SR 1 Europawelle

SWR1 Baden- Württemberg
SWR1 Rheinland -Pfalz
SWR2 Baden -Württemberg
SWR2 Rhineland -Palatinate
SWR3

EinsLive
WDR 2
WDR 3
WDR 4
WDR 5
Radio Europe

German Navteq Traffic transmitter

The sender of the service Navteq Traffic (formerly TMCpro FM) can be found in the same article.

Finland

A free TMC service is available mainly in southern Finland. Both the service and the LT are managed by Finnra, the Finnish National Road Administration. The current version of the LT is 1.31.

France

In France, both services, a free and a commercial service operated.

The free service is sent by the road operators, it includes message on their toll roads. Road operators are AREA, ASF, ATMB, Cofiroute, Escota, SANEF, SAPN, SAPRR, SFTRF and SMTPC. Aired the TMC service is nationwide along the highways on the frequency 107.7 MHz, so it can only be received along the toll roads.

The commercial service V- Trafic is operated by Media Mobile. It is a partnership between TDF, Renault, Trafficmaster and Cofiroute. The service, which replaces the previous Visionaute service will be broadcast on the frequencies of France Inter and can be received nationally. It contains information from the highways with an accumulation in the area of Paris. Initially, this service was also free, but was later converted into a commercial service. But this is not encrypted. By using different LT the user group can be restricted. This process is called Übergangsverschüsselungssystem. The Commercial Service has about 60,000 customers.

Next there is a PayTMC service from ViaMichelin. It is broadcast almost everywhere via the station NRJ and NOSTALGIA.

The LT is published by the SETRA and has 21450 places. The current version is 6.1, and covers the road network both in urban areas and on the highways from. The version 8.0 has been certified in the spring of 2008 by TISA.

Great Britain

The private company ITIS Holding sends a commercial TMC service, the iTMC in the UK. It is broadcast on the FM transmitter. The fee for the service may be included in the price of the vehicle or the navigation system.

In addition to this service exists another, the RAC Live operated by RAC Trafficmaster Telematics (RTT ), a 50-50 joint venture between RAC Motoring Services and Trafficmaster. It uses three private radio stations, GWR, Capital radio and Chrysalis. This nationwide coverage is guaranteed.

Both services use their own LT that are not compatible with each other. IT'S currently broadcasts in version 5.1. Traffic Master is currently using version 3.1.

Italy

In Italy, a TMC service is also available. The CCISS makes the data available. Broadcast is the TMC signal via the RAI station network on Radio 1 The TMC service mainly covers major roads in the north of the country from, especially the east-west motorway.

The LT managed Mizar Media Service is currently in version 1.1. A newer version 2.1 has been certified.

A non-free TMC service of Infoblu is broadcast via the broadcasting network RTL 102.5, it reaches 80 % coverage.

Netherlands

The service provider delivers the data TMC4U in the Netherlands. Currently the service is free, but a service with local messages is planned. TMC4U is a collaboration between Siemens and ANWB. The broadcast will be simulcast on the channel Sky Radio, Radio Veronica, Radio 1 and 3FM. Radio 2 also emits TMC messages.

A second TMC service, operators Vialis, used the station Q -Music, BNR Nieuws Radio and Radio 538

The LT are the responsibility of the AVV Transport Research Centre and are made by TIC Nederland. The current version is 6.1.

Norway

A TMC service is also available in Norway. It is currently available in the field of Østfold, Akershus and Oslo. It is currently working on an expansion of the service to open up large parts of the country. Statens Public Roads Administration, the Norwegian Public Roads Administration ( NPRA ) published the LT. The current version is 2.0. " Destia " send the data encrypted by the Norwegian radio station P4. NRK has an unencrypted offering that is sent through their radio channel NRK P1.

Austria

In Austria, ORF sends the free TMC service by the sender OE1, Ö3, FM4 and regional regional studios, supported by the Federal Ministry for Transport, Innovation and Technology ( BMVIT). Responsible for the LT in Austria highways and expressways - financing company ( ASFINAG ). Currently, version 3.0 is used.

The ORF and ASFINAG Maut Service GmbH launched on 24 June 2009 a new, improved TMC service (TMC PLUS) for Austria.

Poland

In Poland, the commercial TMC service launched on 1 May 2010 at the private radio station RMF FM. The service was provided by a two-year trial period of Destia traffic and was only available for Garmin and Navigon users first, TomTom devices but should follow soon.

Sweden

In Sweden, a free TMC service is available. The Authority Trafikverket (Swedish Transport Administration) is responsible for the free service as well as for the LT. Version 2.0 is currently being used. Version 3.0 was certified in December 2007 by the TMC Forum. The transmission is divided into eight radio zones. In the fields, only those messages are broadcast, the geographically fall within this range. The reports include information on accidents, road works and weather reports on Europe roads, highways and expressways. To broadcast the radio program Sveriges Radio P3 is used, which reaches 98 % of Sweden's population.

Switzerland

In Switzerland, the service of the traffic information center Viasuisse is operated for the LT, the Federal Roads Office is responsible. Since November 4, 2009, version 5.8 is in use. The TMC signal is broadcast throughout the Switzerland of SRG SSR idée suisse about the sender of the first and third FM transmitter chain.

In the German -speaking regions: SRF 1 ( German )
SRF 3 ( German )
La Première (French)

La Première (French)
Couleur 3 (French)
SRF 1 ( German )

Rete Tre ( Italian)
SRF 1 ( German )
La Première (French)

Spain

In Spain, the TMC service is operated by the following organizations:

SCT in Catalonia
DT in the Basque Country
DGT (Traffic General Directorate ) in the rest of the country

The service includes the motorways and national roads as well as " first-order roads ", which are among the autonomous regions of Spain. The LT created DGT, Dirección General de Tráfico, currently at version 2.1.

Czechia

Until 2004 no regular TMC service existed in the Czech Republic. A test operation, coordinated by the CEDA, was aired in 2003. The start of regular operation was planned for mid-2005. The TMC service should initially contain the center of town, and some main roads around Prague. ATT (Transport Telematics Association) ITS activities, the planned service provider of the free local service is TSK (Communication Technical Administration). Over the two state broadcasters CR1 and CR3 a free TMC service is sent, covering the highways (as of 1/2009).

CEDA is responsible for the LT 2004 latest version was 2.41.

USA

In the U.S. satellite radio operator Sirius for several years with the broadcast of the TMC service employs throughout the country. Similarly, Clear Channel is already for some time in the market.

Clear Channel and Navteq send now almost everywhere on FM. Here in the U.S., a variant of the RDS standard is used: RBDS (Radio Broadcast Data System)

Clear Channel is used by eg BMW, Navteq won Daimler and Chrysler as original equipment. Navteq transmitting TMC data via XM and SIRIUS, but Clear Channel has more terrestrial transmitters.

Other countries

TMC in planning

For Portugal, a TMC system is being planned.

Luxembourg has first filed a TMC table for certification at TISA.

Israel has developed a first TMC table.

No TMC service in planning

Ireland (2008 however, there were tests in Dublin)

TMC in test phase

In Dubai, a first LT was published. TMC was in 2008 be received.
Hungary introduced as part of the CONNECT project TMC. Since August 1, 2008 TMC is available as a pay -TMC service in Hungary.
In Singapore, TMC is currently being tested. A LT is already certified by the TMC Forum. The introduction of a commercial service is scheduled for 2008.
In Australia, TMC is currently under investigation. Test broadcasts can be received from time to time in Melbourne.

Induction loop DR (broadcaster) Very high frequency Deutschlandfunk Hessischer Rundfunk 104.6 RTL

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