An onboard device instructs a motorist to brake during a driving simulation Tuesday in Ann Arbor, Mich. The driving simulation was part of a news event marking the start of a yearlong test of cars that can communicate with each other. Carmakers Ford, General Motors, Honda, Hyundai/Kia, Mercedes-Benz, Nissan, Toyota and Volkswagen/Audi all are supplying vehicles and taking part in the test. Officials say eventually this could lead to the devices going in every car. (Associated Press)

An onboard device instructs a motorist to brake during a driving simulation Tuesday in Ann Arbor, Mich. The driving simulation was part of a news event marking the start of a yearlong test of cars that can communicate with each other. Carmakers Ford, General Motors, Honda, Hyundai/Kia, Mercedes-Benz, Nissan, Toyota and Volkswagen/Audi all are supplying vehicles and taking part in the test. Officials say eventually this could lead to the devices going in every car. (Associated Press)