An Automated Car Convoy is a string of computer controlled driverless cars slaved to the directions of the professional driver leading the group. The driverless cars maintain the correct speed and distance from the lead car.
Such car platoons would in theory cut down on congestion, improve safety, and reduce environmental impact by increasing fuel efficiency. In Sweden the SARTRE system recently had its first real world test of its prototype system on a Volvo track in Sweden. The test used a leading truck and just one trailing car.