Which statement correctly describes the operator's obligation when a Stop or Emergency Stop signal is given?

Which statement correctly describes the operator's obligation when a Stop or Emergency Stop signal is given?

• A. Display/speak the Stop or Emergency Stop signal.
• B. Notify the supervisor after the lift.
• C. Crane operators are required to obey this command regardless of its source.
• D. The signal has no effect on operations.

Answer: (C)

A Stop or Emergency Stop signal is a safety-critical command that must be obeyed immediately, regardless of who issues it. The moment the signal is given, the crane should cease all movement to prevent injury or damage, and the operator should follow established restart procedures only after confirming it is safe to resume. Simply displaying or speaking the signal doesn’t stop the crane, and waiting to notify someone afterward delays critical safety action. The signal is designed to have immediate effect, so assuming it has no impact is incorrect.