Cars that talk

Via Slashdot from “The Future of Things”Cars that Talk. Europe has reserved spectrum space for vehicle-infrastructure communication systems. Hopefully the same standard is adopted globally so I can drive my Subaru to France.
Seriously, I think the best use would be for cars to broadcast locally their ID, position, velocity, and acceleration so that other cars will know the position of neighbors accurately. This will greatly help automated vehicles maneuver on roads. Smart autonomous cars would be able to operate in mixed traffic. (Clearly they would need ways of detecting vehicles that were not broadcasting as well, but if all nearby vehicles could be located, it would help a lot).