Click on the link below to read the article from the New York Times about real time traffic sensing using cell phones:
TECHNOLOGY | July 05, 2011
Bits: Phone Data to Give a Picture of Traffic Shutdown in L.A.
By JOSHUA BRUSTEIN
A Los Angeles television station has partnered with a tech startup to use location data from smartphones to track the effects of a major highway closure.
Comment: In December 2010, I was able to listen to an executive from Honda brief the GITA Japan Conference at Tokyo University. Honda is on the verge of releasing an intergrated sensor system for its cars that will automatically provide the same fed as related in this article (and other aps like Google Maps for Mobile) and much more - to include automatically transmitting road conditions (how wet/slick is it) and broadcasting GIS based warnings concerning flooded areas as sent in by other cars in the system.