Final answer:
When one vehicle is towing another, there must be a distance between them to ensure safety.
Step-by-step explanation:
When one vehicle is towing another, the distance between the two must be greater than zero to ensure safety.
This is because there needs to be enough space between the vehicles for the towing vehicle to maneuver properly without causing any collisions or accidents.
The specific distance required may vary depending on factors such as the size and weight of the vehicles, the speed at which they are traveling, and any applicable traffic laws or regulations.
It is important to always follow the recommended towing guidelines and regulations provided by the vehicle manufacturer and local authorities to ensure safe towing practices.