Traffic Message Channel

NOTE: TMC (Traffic Messaging Channel) is not available in all markets.

TMC is a function of the FMRDS (radio data system). The system broadcasts real-time traffic and weather information. Data messages are received and decoded by the IAM integral receiver. The IAM processes the received information and alerts the driver of a problem on the planned route and calculates an alternative route to avoid the incident. All TMC events on the map can be viewed not just the ones on the calculated route.

TMC traffic information systems conform to a global standard that has been adopted by traffic data gatherers, information service providers, broadcasters and vehicle/receiver manufacturers.

All TMC receivers use the same list of event codes, while the location database (on the IAM hard drive) contains both a country-specific set of location codes for the strategic European road network.

TMC traffic data is currently broadcast in many European countries and the USA.

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 and can be translated by the IAM into the market language. Location code tables assign numbers to locations on the road network. These location tables are integrated in the maps stored on the IAM hard disk drive. The source of traffic information is typically police, traffic cameras and local network stations.

The TMC system uses the existing FM antenna and audio system antenna amplifiers to pass the signals to the IAM.

For additional information, refer to: Antenna