What is the hand and arm signal for indicating a slow or stop?

Answer: D — Hand and arm downward

The hand and arm signal for indicating a slow or stop is represented by extending the hand and arm downward. This signal is crucial for communicating intentions to other road users, especially in situations where a vehicle's brake lights may not be visible. Extending the arm downwards clearly conveys to drivers behind you that you are slowing down or coming to a stop, which is essential for maintaining safety on the road. In contrast, other signals serve different purposes: raising the hand at shoulder level typically indicates a left turn, while extending the arm horizontally indicates a right turn. The upward signal is reserved for informing others that you are making a right turn. Each signal has its defined use to ensure clear communication among drivers and maintain safe driving practices.