turn signal

US /ˈtɝːn ˌsɪɡ.nəl/
UK /ˈtɝːn ˌsɪɡ.nəl/
"turn signal" picture
1.

转向灯, 方向灯

a flashing light on a vehicle that indicates the driver's intention to turn left or right, or to change lanes

:
Don't forget to use your turn signal when changing lanes.
变道时别忘了打转向灯
The driver failed to activate his turn signal before making the turn.
司机在转弯前没有打开转向灯