What does an arm signal with the arm out and down indicate?

An arm signal with the arm extended out and down indicates the driver's intention to slow down or stop. This is part of the hand signaling practices which are used to communicate with other road users when the vehicle's signal lights might not be visible or functioning. By using this arm position, the driver effectively alerts following vehicles and pedestrians that they should prepare for a change in speed or a complete stop, thus enhancing road safety.

In contrast, other arm positions signal different intentions: an arm extended straight out indicates a left turn, while an upward arm position signifies a right turn. A hazard warning is typically communicated through the use of hazard lights rather than hand signals. Understanding these signals is crucial for promoting safe communication on the road.