thecarchik writes: Denso has modeled the next iterations of a "smart traffic light" system. It would use messaging between vehicles and the traffic-light controller to let the light make better decisions about when to change, to maximize overall vehicle throughput. And that, in turn would reduce the number of minutes cars spent idling at traffic lights, cutting their emissions and their fuel usage. In other words, cutting red-light time helps you go green. Denso's proposed system uses short-range wireless transmitters (think your WiFi router) in cars and elements of the road infrastructure. The field is broadly known as V2V (for vehicle to vehicle) communications.