Which hand signal represents a command to stop in crane operations?

The hand signal representing a command to stop in crane operations is both arms raised overhead with palms facing forward. This signal is universally recognized among crane operators and signalers as a clear indication that the crane and its load must halt immediately. The positioning of both arms overhead with the palms facing the operator ensures visibility, making it less likely to be misinterpreted amid the visual distractions often present on a job site.

This signal is essential for maintaining safety and preventing accidents, as it provides a direct and unmistakable command. Clear communication through standardized signals is vital in crane operations, where the driver may not always have a direct line of sight to the load or the signaler.

Other signals, such as one arm raised with a fist or one arm extended sideways, represent different commands in the signaling system, and using them for "stop" could lead to confusion and unsafe situations on the work site. Both arms lowered to the sides typically indicates a neutral or unclear status, rather than a definitive command to cease movement. Therefore, the distinctive overhead arms signal is crucial for effective communication and safety in crane operations.