说明：  程序是东西红灯亮30秒，南北绿灯亮24秒 东西红灯亮，南北绿灯闪3秒然后熄灭 黄灯亮3秒
(Program is what turns red, 30 seconds, north and south green light 24 seconds Red light, the north and south green light flash for 3 seconds and then go out Yellow lights for 3 seconds)