Cars avoid crashes by talking to each other

In this photo taken, Tuesday, May 22, 2012, professional test driver Dave McMillan, from Los Angeles, demonstrates the dashboard warning signal in a Buick Lacrosse at an automobile test area in Oxon Hill. The display at a recent transportation conference was a peek into the future of automotive safety: cars that to talk to each other and warn drivers of impending collisions. Later this summer, the government is launching a yearlong, real-world test involving nearly 3,000 cars, trucks and buses using volunteer drivers in Ann Arbor, Mich. (AP Photo/Susan Walsh)