Final answer:
When driving behind another vehicle, you must use brakes for keeping a safe distance between the vehicles.
Step-by-step explanation:
When driving behind another vehicle, you must use brakes for keeping a safe distance between the vehicles. The brakes allow you to slow down or stop your vehicle to maintain a safe following distance. This is important to prevent accidents and give yourself enough time to react if the vehicle in front of you suddenly stops or slows down.