What should a driver ensure when stopping behind another vehicle?

The correct choice emphasizes the importance of maintaining a safe stopping distance behind another vehicle by ensuring that the driver can see the rear wheels of the vehicle in front. This visual reference helps the driver to gauge both their distance and the position of the vehicle ahead, allowing for a safe buffer zone.

Seeing the rear wheels of the vehicle in front indicates that there is sufficient space to react if the vehicle suddenly stops or requires a quick maneuver. This distance also enables better visibility in case the vehicle in front needs to reverse or if there are any obstructions, helping the driver maintain a safe driving environment.

Understanding why this is important can enhance safety on the road. If a driver is too close and unable to see the rear wheels, they risk being too close to react in an emergency, which can lead to collisions. Therefore, maintaining this reference point is a critical part of safe driving practices.