What indicates that a driver is preparing to turn left?

When a driver is preparing to turn left, the left arm extended horizontally is the proper signal. This arm position communicates to other road users that the driver intends to make a left turn. Hand signals are universally recognized methods of indicating driving intentions, particularly when vehicles are not equipped with turn signals or in situations where visibility may be compromised.

The right arm extended signifies a turn to the right, while both arms down indicates the driver is stopping or slowing down. A left arm bent upwards actually signals a right turn. Understanding these signals helps promote road safety by ensuring that all drivers and pedestrians understand the intentions of vehicles on the road.