What does an alternating arm movement usually signify?

An alternating arm movement typically signifies the intent to move the load in a back-and-forth motion. This signal is crucial in crane operations where precise load control is necessary. When a signal person uses alternating arm movements, it communicates to the operator that the load should not only move horizontally but also be maneuvered quite deliberately. This specific signaling is important, especially in situations where obstacles may be present or when the load must pass through a tight space, ensuring that all crew members are aware of the required movement pattern to maintain safety and efficiency.

In contrast, the other options refer to different signals that have distinct meanings. For instance, stopping the load or preparing for lifting would require different signal movements, such as a single raised arm or a specific hand gesture indicating readiness. Gradually lowering the load is also communicated with specific signals that differ from alternating movements. Hence, understanding the correct interpretation of signaling is vital for effective communication between the signal person and the crane operator.