Traffic Message Channel - Coverage

Coverage

In some places, TMC coverage is smaller than that of the radio programme carrying the TMC service, therefore white spots exist. For example, in the USA, one of the two TMC commercial services is run by Clear Channel Communications, whose 95 FM station urban markets will probably all have some level of traffic information services. However, the other is Sirius Satellite Radio, which covers all of North America, including deeply rural areas and almost empty deserts. Although vendors are beginning to make arrangements with statewide and multi-state information source systems such as CARS, operated by state police and state departments of transportation, it can be expected that coverage will remain sketchy in some states during the next few years.