turn signal

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

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

:
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Don't forget to use your turn signal when changing lanes.
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The driver failed to activate his turn signal before making the turn.
:
blinkerindicator
:
signalsignalertime signalsmoke signalsignal boxturnturning