初始状态两个路口的红灯全亮；之后东西路口的绿灯亮，南北路口的红灯亮，此时东西方向开始通车；延迟一段时间，东西路口的的绿灯灭，然后黄灯闪烁；闪烁若干次后东西路口的红灯亮，同时南北路口的绿灯亮，南北方向开始通车；延迟一段时间后，南北路口的的绿灯灭，然后黄灯闪烁；闪烁若干次后南北路口的红灯亮，同时东西路口的绿灯亮；反复上述过程-Initial state two junctions red light　something after crossing the green light, red light intersection north and south, east-west direction at this time opened to traffic　delay time, the intersection of the green stuff off, then flashing yellow light　flashing number times things junction red light green light while north-south junction, north-south direction was opened　delayed for some time after the north and south of the junction of the green light is off, then the yellow light flashes　blink several times after crossing the red light north-south, while something green light intersection　repeated the above process