turn signal switch

例句：

1. 1.The driver needs to turn the signal switch to indicate his intention to turn left.
   司机需要转动转向信号灯来表示他打算左转的意图。
2. 2. The traffic policeman used the turn signal switch to alert other drivers of his presence.
   交通警察使用转向信号灯来警告其他驾驶员他的出现。
3. 3. When the car reached the intersection, the driver turned the signal switch to ensure that all traffic was moving in the correct direction.
   当汽车到达十字路口时，司机转动转向信号灯以确保所有交通都朝正确的方向移动。