What is the most important hand signal to agree on with a helper?

The most important hand signal to agree on with a helper is to stop. This signal is crucial for safety in various situations, especially when operating large vehicles. When working with a helper, clear communication about stopping is essential to avoid accidents or collisions. If a helper signals to stop, it indicates an immediate need to cease all movement to prevent potential dangers, such as oncoming traffic, pedestrians, or other hazards.

The ability to stop effectively can prevent serious injury or damage both to the vehicle and the surrounding environment. While the other signals have their importance, a signal to stop is critical as it requires immediate action and could be the difference between a safe operation and a dangerous situation. Establishing this as the top priority ensures that everyone involved understands when to halt operations for safety.