Ad-hoc traffic jam identification (Score 1)

I blogged this idea last year (and, yes, I know it wasn't a wholly original idea then, either--some guys had driven around with laptops already)

My idea then was for having cars talk to each other about traffic: "As a car approaches a pack of other cars, it connects to their network. The pack of cars can tell the new car the average speed and size of the network (and if there's GPS information, maybe even the beginning and end of the pack), which the driver--maybe with the help of some mapping software--can use to determine whether to stay in the pack or get off at the next available opportunity."

iTunes and all other stuff we already do with networks are implicit, but I thought it would be interesting to see what new ideas could come from this kind of network