An advanced fuzzy controller for traffic lights

In the paper a realistic approarh to fuzzy control of urban road traffic lights is described. Fuzzy application is encouraging since the design procedure of vehicle actuated traffic light systems is very transparently, and an adaptation to changing situations of traffic is easily to accomplish. The paper presents simulation results obtained for an intersection with 12 main direction traffic flows. The fuzzy controller proposed switches to a two-state, a three-state or a four-state control. The results with respect to the average loss of traveltime are very promising in comparison with other controllers applied to the same simulation example.