When one vehicle is towing another, the distance between the two must not exceed how many feet?

Answer: B — 15 feet

The correct understanding of the distance that should be maintained between a towing vehicle and a towed vehicle is crucial for safety on the road. The specified maximum distance of 15 feet helps ensure that the towed vehicle remains close enough to the towing vehicle, allowing for better control and reducing the risk of accidents. Maintaining this distance is important because if the gap is too large, it can lead to increased swaying or instability of the towed vehicle, making it difficult for the driver of the towing vehicle to maneuver safely. In addition, a greater separation could make it harder for the following drivers to gauge the distance to the towed vehicle, potentially increasing the risk of collisions. It's also important to recognize that distances greater than the recommended limit can lead to legal issues or fines, as specific regulations dictate how towing should be conducted to ensure not only the safety of the vehicles involved but also the safety of all road users.