What should a signal person do if they lose sight of the crane?

When a signal person loses sight of the crane, the safest and most responsible action is to stop all operations until visibility is regained. This ensures that there are no potential accidents or misunderstandings regarding the crane's movement, which could endanger workers or damage equipment. Stopping operations allows the signal person to maintain control of the situation and ensures that they can safely communicate with the crane operator when visibility is restored.

Continuing to signal or trying to reposition oneself, while intuitive, could lead to dangerous situations where the crane might move unpredictably, increasing the risk of accidents. Additionally, signaling with louder commands does not address the underlying issue of visibility and could further complicate communication, as the operator might not be able to act effectively without seeing the signal person. Thus, halting operations is the most prudent choice.