南北绿灯亮30S、东西红灯亮25S、东西黄灯闪烁5S.再东西绿灯亮30S,南北红灯亮25S、黄灯闪烁5S.如此循环。-North-South green light 30S, something the red light 25S, things flashing yellow light 5S. And then the green light thing 30S, north-south red light 25S, flashing yellow light 5S. So the cycl