Nice idea. But until the congestion problems are significantly reduced - traffic routing via any kind of network will have little to marginal effect. And most vehicle navigation and aftermarket GPS systems already integrate traffic patterns with routing.

I think this goes way beyond what is being done today. I don't know why more effort isn't going into the low hanging fruit of intelligent intersections. All it would take is a few sensors and a little bit of processing power and typical suburban traffic flows could be significantly improved. I'm thinking of the case where I sit at a red light forever while there's no cross traffic. Then the light changes right when some cross traffic shows up, so they have to wait. With a smart intersection, no one would have stopped.

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I can think of a lot of places around here where the sensors used for traffic lights create more problems than they solve. IE: A series of traffic lights close enough to each other that end up changing to red even when there are no cars on the cross streets... just as you reach the next intersection from the previous light. Lights that close together should all turn green at the same time.

Cervus, those sound like dumb short range sensors, if they are even that. (Maybe just timers) The kind of thing I'm thinking of would sense cars from farther away, maybe even have knowledge of all traffic within some distance (say a quarter mile) and would have enough intelligence to keep traffic moving better than today's signals would.