A method and system for transferring information between a moving vehicle and a stationary information location having a vehicle detector system with a loop antenna by using the loop antenna as either the receiving antenna for signals transmitted from a moving vehicle or as the transmitting antenna for...http://www.google.es/patents/US4996716?utm_source=gb-gplus-sharePatente US4996716 - Vehicle communication system using existing roadway loops
Vehicle communication system using existing roadway loops
