What does a two-handed wave signal indicate?

A two-handed wave signal is universally recognized as an "emergency stop" or a warning of danger. This signal is crucial in construction and signaling operations because it conveys a clear message that immediate attention is required, and all operations should cease to ensure safety. The use of both hands in a waving motion emphasizes the urgency and importance of the signal, making it easily recognizable among workers, particularly in high-risk environments.

In practice, this signal helps prevent accidents and allows the signal person to take responsibility for the safe movement of equipment and personnel in the vicinity. Such visual communication is vital in noisy environments where verbal commands may not be audible, ensuring that all personnel are aware of potential hazards and can take appropriate action to protect themselves and others.

The other choices represent different signals or requests that would not align with the specific intent of the two-handed wave, thereby reinforcing the clarity and uniqueness of this particular gesture in safety and emergency situations.