A traffic control device information display system. This system includes a receiver that receives information from a traffic control device transmitter for a traffic control device, a processor that processes the information to determine identification information and location information for the traffic...http://www.google.es/patents/US6747574?utm_source=gb-gplus-sharePatente US6747574 - Traffic control device transmitter, receiver, relay and display system
Traffic control device transmitter, receiver, relay and display system
