Any additional hand signals must be:

The requirement for any additional hand signals to be approved by the user is critical for ensuring clear communication and safety among crane operators and ground personnel. This approval process allows the user to verify that all team members understand the meanings of the signals, reducing confusion and the risk of accidents during crane operation.

Approval by the user also ensures that the signals are appropriate for the specific work environment and crane operation, as different sites or projects may have unique needs or considerations. Standardization is important, but it is more relevant to established signals recognized industry-wide. By requiring user approval for any extra signals, the potential for misunderstanding is minimized, fostering a safer work environment. Ensuring that all crew members are trained and adequately informed about these approved signals is an essential aspect of effective safety practices in crane operation.