turn signal

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

lampu sein, lampu isyarat belok

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.
Jangan lupa gunakan lampu sein saat berpindah jalur.
The driver failed to activate his turn signal before making the turn.
Pengemudi gagal menyalakan lampu sein sebelum berbelok.