In order to reflect the change of traffic flow timely and achieve the optimal control effect

a real-time simulation system for traffic signal timing plan based on ARM Cortex-A8 is designed and realized.It is integrated in signal controller distributed in each intersection.In design of application software

analyze an intersection with four-phase traffic flow;and take average time delay as evaluation index for modeling and use genetic algorithms to simulate each scheme under current traffic flow

and evaluate optimal timing scheme.It is verified by practice that the system can give the optimal solution timely and decrease average time delay of vehicle.