SARTRE

Road train research project
The convoy of vehicles in a road train is driven automatically by a professional driver in the lead vehicle, which may be a truck or coach, following a pre-defined route. In addition to their efficient use of road space, road trains may also be able to use high occupancy vehicle or bus/taxi lanes, hence further reducing journey times.


More details here: http://www.volvoclub.org.uk/press/releases/2012/sartre.shtml