交通灯实现正常时序控制及急车强通两种控制方法。启动开关接通时，交通信号按时序图工作，并且各个方向的红、黄、绿灯接通时间倒计时显示。有急车来时，将急车强通开关按一次，不管原来信号灯的状态如何，一律强制让急车来车方向的绿灯亮，使急车放行，直至急车通过为止。-The traffic lights at the normal timing control and emergency vehicle through two control methods. Start switch is turned on, the traffic signal timing diagram, and in all directions of red, yellow, green on-time countdown display. Emergency vehicle to emergency vehicle pass switch according to the time, regardless of the original state of the lights shall be forced to let the emergency vehicle to drive the direction of the green light, so that the release of emergency vehicle until the emergency vehicle by far.