在繁忙的十字路口，红绿灯帮助维持交通秩序。

At busy intersections, ___stoplights help maintain traffic order.

他忘记修车的尾灯了，所以夜间驾驶时要格外小心。

He forgot to fix his car's rear ___stoplights, so he needs to be extra careful when driving at night.