Auxiliary towing lights are:

Auxiliary towing lights play a crucial role in ensuring the safety and visibility of a towed vehicle on the road. Specifically, they are designed to serve as stop, tail, and turn lights for the trailing end of the towed vehicle. This is essential because when a vehicle is being towed, the lights of the towing vehicle do not necessarily illuminate or indicate the braking and turning actions of the towed vehicle. Therefore, auxiliary towing lights provide clear communication to other drivers about the movements of the towed vehicle, enhancing overall safety.

By effectively illuminating the stopping and turning actions, these lights help prevent accidents and ensure that the towed vehicle is visible to other road users. This function is vital in situations where the towed vehicle may not have operational lights, such as during a breakdown or when it is not equipped with its own lighting system.

While backup lights, the lights on the back of the tow truck, and other related lighting may contribute to safety in different ways, they do not fulfill the specific function that auxiliary towing lights serve for the towed vehicle. Thus, the correct focus on stop, tail, and turn signals makes the selected answer the most accurate in detailing the role of auxiliary towing lights.