What is the most crucial hand signal that drivers and helpers should agree on?

The most crucial hand signal that drivers and helpers should agree on is the signal to STOP. This signal is essential for ensuring safety during operations, particularly in situations where visibility may be limited, or noise levels are high. When a driver receives a STOP signal, it immediately indicates that they should halt all operations to prevent accidents, collisions, or injury to helpers who may be working in close proximity to the vehicle.

Establishing a clear understanding of the STOP signal can be life-saving, as it allows for immediate recognition of a dangerous situation. Other signals, while important for communication during maneuvers such as turning or moving forward, do not carry the same level of urgency and potential for disaster if ignored. Therefore, ensuring that both driver and helper have a mutual understanding of the STOP signal is critical for maintaining a safe working environment.