turn signal

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

seta, pisca-pisca

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.
Não se esqueça de usar a seta ao mudar de faixa.
The driver failed to activate his turn signal before making the turn.
O motorista não ativou a seta antes de fazer a curva.