What should the driver/operator do if they lose sight of the spotter while backing?

When the driver/operator loses sight of the spotter while backing, the appropriate action is to stop and set the parking brake. This choice emphasizes safety as it prevents any potential accidents or collisions that may occur if the vehicle continues to move without guidance. Stopping the apparatus immediately allows the driver to assess the situation, regain visibility of the spotter, or communicate with them to ensure safe maneuvering.

Continuing to back up without visual confirmation from the spotter can create hazardous conditions, as the driver may not be aware of obstacles or people in the vicinity. Relying on auditory signals, such as sounding the horn, does not provide the necessary situational awareness that visual confirmation offers. Calling for additional spotters may be a prudent step, but the immediate priority should be to halt movement to prevent an incident. Therefore, stopping and securing the vehicle is the safest method of response when visibility is compromised.