While in individualistic America the autonomous driving push has been behind standalone cars, in Europe the first successful test was that of a caravan known as Project SARTRE (Safe Road Trains for the Environment). The concept is also known as a road train: cars attach themselves (virtually, not physically) to a road train that guides them along, and when they’re ready to get off, they veer off and the road train re-configures itself. While in the train, each car follows the one in front of it, and directions on what to do are passed from car to car via a wireless network that the train creates on the fly. The technology behind it is built by Volvo and has been tested on private courses, but this test was done on 125 miles of public roads in Spain, traveling at about 50mph.
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