Car2X technology-based “Green Light on Demand” system

Car2X technology helps obtain information about individual vehicles, which acts as an accurate data resource for determining traffic status from the viewpoint of a traffic signal controller designing phase timing. Based on Car2X technology, a prototype system for “Green Light on Demand,” which means adapting traffic signal automatically for privileged vehicles if necessary, is developed. Two types of passing algorithms for privileged vehicles at a single intersection are proposed. The first algorithm was tested by conducting a field experiment, and the result demonstrates that the system can reduce the number of stops for privileged vehicles. The second algorithm was tested in a simulation experiment, the results of which prove that the signal control algorithm can reduce the travel time and number of stops for privileged vehicles, while not having any significant effect on normal vehicles.