An electronic device for being carried on a vehicle for transmitting information to a vehicle following it over a given route. The electronic device is also intended to receive information coming from a vehicle preceding it over the same route. The device includes a transmitter for transmitting information...http://www.google.com.au/patents/US5289182?utm_source=gb-gplus-sharePatent US5289182 - Electronic anti-collison device carried on board a vehicle
