one of a set of red, yellow, and green lights that control the movement of vehicles, usually at a point where two or more roads join

The police pulled him over for failing to stop at a red traffic light. 他因为闯红灯被警察要求停靠路边。

Turn left at the traffic lights. 在红绿灯那儿向左转。

The traffic lights changed to/turned green as we approached the junction. 我们接近十字路口时，交通信号灯变成了绿色。