Here's the Wikipedia entry for TMC.
Originally Posted by Wikipedia
There is absolutely no cost associated w/ this service and there is no need for satellite radio either. I do not have satellite radio in the Avant and do not subscribe to any kind of services to obtain TMC data.
TMC data is shown in 2 places: on the map under the "Nav" Menu and under the "Info" Menu. Under the "Nav" Menu, the data is displayed on the map when available, whether you're using the navigation or not. It displays traffic speed conditions as well as incidents. Under the "Info" Menu, details about incidents in your vicinity are displayed. If you're navigating, then only the incidents along your route are displayed, otherwise all incidents are displayed ordered by proximity.
1st set of Screen Shots: Traffic speed condition - real/actual live data
Location: Golden Gate Bridge, CA
2st set of Screen Shots: Incident data - Winter storm - not real data
Location:Greater Sacramento Area, CA