In the future, small caravans of cars could wirelessly become insta-social networks on the highway, sharing information, preventing crashes. From ArsTechnica:

“But what if getting on the highway also meant joining a wireless mesh network consisting of all the cars around you? Cars could become a self-organizing entity, avoiding collisions and minimizing traffic congestion. The cars themselves would be smart enough to cooperate with each other.

‘You can imagine in the future, you could enter the highway, mesh with five or six other vehicles around you and you caravan together,’ said Dan Rabinovitsj, senior VP of chipmaker Qualcomm Atheros’s networking business unit. ‘You’re essentially making sure you’re not just keeping proper distance from the front and back, which a number of vehicles do today, but literally in 360 degrees. And of course passing along messages: there’s a policeman up ahead, there’s an accident up ahead, or there’s a stoplight. All of these things are starting to intersect.'”