What is the function of an insulated bucket truck?

The function of an insulated bucket truck primarily revolves around safety while working near or on live electrical lines. These vehicles are equipped with insulating materials that prevent electric current from passing through the truck into the worker, thereby significantly reducing the risk of electric shock. This feature is critical during tasks such as performing repairs or installations where linemen are in close proximity to energized conductors.

While the other options describe tasks that can be associated with the use of a bucket truck, they do not capture the essential purpose of an insulated bucket truck specifically. Transporting equipment, providing shelter from the weather, and assisting with overhead lighting may all be secondary functions, but the primary role of the insulated bucket truck is focused on safety through insulation when dealing with high-voltage power lines.