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

When a signal person loses sight of the crane operator during operations, the most crucial action is to immediately stop signaling until visibility is regained. This choice is correct because safety is the primary concern in crane operations. Continuing to signal without clear visual contact can lead to miscommunications that could result in accidents or unsafe situations.

Stopping all signaling ensures that the crane operator is not acting on possibly outdated or incorrect signals, which could jeopardize the safety of workers in the area and the stability of the load being moved. Regaining sight of the operator allows for clear and effective communication, maintaining the safety protocols essential in crane operations.

The other options involve actions that could potentially compromise safety. Continuing to signal based on last known actions might lead to dangerous consequences if the circumstances have changed. Asking for someone else to take over may not be feasible or safe without a clear transfer of information and could lead to confusion. Yelling instructions from a distance could further complicate the situation, as these instructions might be misheard or misunderstood, increasing the risk of accidents.