Being trialled on an ASV-5 (Advanced Safety Vehicle) Sedan – based on the Mazda6/Atenza – on public roads in Hiroshima, the system uses 700MHz radio waves to allow cars and trams to communicate on a range of data including the type and location of a vehicle, the direction they're heading, and braking and turn signal information.

The ASV-5 sedan is equipped with autonomous millimetre wave and microwave sensors as well as cameras to monitor its surroundings and keep track of pedestrians, road markings, other vehicles and trams.

The technology has been developed by a consortium made up of Mazda, the University of Tokyo, Hiroshima Electric Railway Co. and Japan's National Traffic Safety and Environment Laboratory.