How It Works
Each traffic incident is binary-encoded and sent as a TMC message. Each message consists of an event code and a location code in addition to expected incident duration, affected extent and other details.
The message is coded according to the Alert C standard. It contains a list of up to 2048 event phrases (1402 as of 01.02.2007) which can be translated by a TMC receiver into the language of the user. Some phrases describe individual situations such as a crash, while others cover combinations of events such as construction causing long delays.
In Europe, location code tables are maintained on a national level, assigning numerical codes to locations (typically major junctions) on the road network. Those location tables are integrated in the maps provided by in-vehicle navigation system companies such as Nokia and Tele Atlas, and by vehicle manufacturers such as Volvo. In other countries, such as the U.S. and Canada, private companies maintain the location tables and market TMC services commercially.
Sources of traffic information typically include police, traffic control centers, camera systems, traffic speed detectors, floating car data, winter driving reports, roadwork reports and others.
Read more about this topic: Traffic Message Channel
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