Who is required to obey the Stop or Emergency Stop signal, regardless of source?

• A. Crane operators are required to obey this command regardless of its source.
• B. Only the lift supervisor
• C. Only the signaler
• D. Only the owner of the crane

Answer: (A)

The Stop or Emergency Stop signal is a safety command that takes priority for the crane operator because it halts movement immediately to prevent injury or damage. No matter who issues the signal—be it a lift supervisor, a signaler, or any worker—the operator must stop the crane right away. This universal obedience ensures that danger is addressed as quickly as possible and provides a clear moment to assess the situation before resuming work. After stopping, the operator should ensure the area is safe and follow the proper restart procedures with the appropriate authority. The rule isn’t about restricting who can signal; it’s about the operator treating any Stop command as an immediate instruction to stop for safety.