Abstract: The present invention is a system and method for dynamically and accurately allocating green light time of a traffic light at a given intersection by counting the number of vehicles located in an approach to a given intersection. A signal controller radio transceiver of a stationary intersection mounted control unit (CU) receives identifying signals transmitted by the on board vehicle radio transceiver of vehicles located at an approach to this intersection. A signal controller interface processing unit of the CU at the given intersection is operable to disregard signals transmitted by vehicles located at one or more upstream intersections and by pedestrians and passengers of a common motor vehicle. The number of vehicles located at an approach is thereby counted, allowing the CU to dynamically allocate green light time of a corresponding traffic light in accordance with traffic arrangement, for example per approach or per signal group, and design preferences.