What is the most important hand signal that you and your helper should agree on?

In a situation where you and a helper are coordinating maneuvers, the most critical hand signal to agree upon is the signal for stopping. This is because safety is paramount; being able to stop promptly can prevent accidents and ensure that both the driver and the helper are on the same page. If either party is unsure when to stop, it could lead to dangerous situations, especially in tight quarters or around pedestrians.

Clear communication is essential when operating larger vehicles, where visibility may be compromised and where stopping quickly might be necessary for safety. Therefore, establishing a mutual understanding of the hand signal for stop ensures that both parties can address any potential hazards immediately. The other signals, while important, may not carry the same urgent implications as the stop signal in preventing accidents.