我们设计一个简单的十字路*通灯。交通灯分东西和南北两个方向，均通过数码管和指示灯指示当前的状态。设两个方向的流量相当，红灯时间45s，绿灯时间40s，黄灯时间5s.-We design a simple traffic light intersection. West and East, and North-South traffic lights both directions, both through the digital control and the indicator indicates the current state. Traffic in both directions set equal to the red light time 45s, green time 40s, the yellow light time of 5s.