设有两条通行通道，分别沿方向1和方向2通行。每一方向都有红、黄、绿组成的交通信号灯。这些信号灯由相应的高有效信号（R1,G1,Y1,R2,G2,Y2）来驱动。当有特殊情况时，加一个闪烁灯显示，按键，所有红灯亮，再按下时，解除红灯亮；要求绿灯点亮时间为20s,黄灯点亮时间为5s。-Has two access channels, respectively, along the direction 1 and direction 2 to pass. Each direction has a red, yellow, green, composed of traffic lights. The signal from the corresponding high signal (R1, G1, Y1, R2, G2, Y2) to drive. When there are special circumstances, plus a flashing light display, buttons, all red light, and then pressed, the lifting of the red light　requirements of green light time to 20s, the yellow light time of 5s.