Just a Few Talking Cars Could Eliminate Gridlock

German researchers have found that just five cars in a thousand communicating with one another is all it takes to reduce congestion. That may not sound like a whole lot of automobiles, but it is sufficiently representative of traffic flow to allow traffic engineers to determine how best to manage traffic and alleviate rush-hour jams and construction delays. The finding comes as German officials prepare to roll out a vehicle-to-vehicle communication to alleviate traffic congestion and a growing number of automakers explore the technology.