turn signal
US /ˈtɝːn ˌsɪɡ.nəl/
UK /ˈtɝːn ˌsɪɡ.nəl/

1.
señal de giro, intermitente
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.
No olvides usar la señal de giro al cambiar de carril.
•
The driver failed to activate his turn signal before making the turn.
El conductor no activó su señal de giro antes de girar.