What does a signal composed of waving hands back and forth typically indicate?

A signal composed of waving hands back and forth is widely recognized as a clear indication for stopping or as a signal of the inability to communicate effectively. This gesture generally conveys urgency and can imply that immediate action is required to halt operations to ensure safety. In situations where communication is compromised, such as poor visibility or noisy environments, this hand signal serves as a universal method to alert operators to come to a stop or to pause any ongoing activities, thus preventing potential accidents or misunderstandings.

This understanding of the signal is crucial in maintaining safety protocols during crane operations, where clear and precise communication is vital to prevent mishaps.