TMC data gives prompt, accurate notification of accidents, road construction, police, or emergency action, etc.—so drivers can visually monitor traffic flow and, if necessary, select an alternate route.
Subscription Information
In the U.S.: The GTM 10 traffic receiver comes preloaded with a 15-month trial subscription to Clear Channel TMC. To continue the service, a one-year subscription is $60.00.
http://www.garmin.com/products/gtm10/
PS: Есть еще Том Tom trafic, Nuvi, etc
Еще интересная штучка ( DC and NYC нет ):
http://www.TrafficGauge.com/