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Sounds like the Audi travolution experiment :

HowStuffWorks "How Audi's Travolution Device Will Work"

Intelligent transportation systems involve numerous technologies, some already widespread, others merely developing. On the infrastructure side, intelligent traffic lights play a major role in keeping vehicles flowing along, and feature prominently in Audi's Travolution system. The city of Ingolstadt boasted 46 intelligent traffic lights during the summer of 2008, with plans for 50 more throughout the city. These lights are networked together, which reduces stopping time for vehicles. Again, the idea is not to simply create clockwork barriers for traffic to filter through, but to manage the flow of traffic for maximum efficiency.

The Travolution system also features an intelligent vehicle component, and this is where the system really appeals to hypermilers. The traffic lights don't merely communicate with each other; they communicate with the vehicles themselves -- in this case, specially augmented Audis. During the summer of 2008, the company had two vehicles on the road, but plans to add an additional 20 vehicles.

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