Nokia GPS Phones -- Real Time Traffic Information

Nokia has developed software that allows data to be received from GPS enabled phones, which is then compiled and interpreted into traffic flow patterns. The plans are currently at concept stage, with a demonstration recently taking place as a joint venture between Nokia, California Center for Innovative Transportation (CCIT), CalTrans, and Berkeley's Department of Civil and Environmental Engineering.
textually.org: Nokia GPS Phones to Fight the Traffic Plague
"This is really the first time that you can take an urban system, like a big city, and try to see in real time how it lives, how people move and what's happening in the city," says Carlo Ratti from MIT.

"In the city for example you've got taxis with GPS, you've got buses with GPS, and also you've got mobile phones.

"If you take that information and you apply artificial intelligence and algorithms to it, then you can understand very interesting things about the urban system," he says.
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Concepts: Nokia GPS Phones to Fight the Traffic Plague