What is the purpose of a proper following distance?

The purpose of a proper following distance is fundamentally to ensure enough time to react to any sudden changes on the road. Maintaining an adequate distance between your vehicle and the one in front of you gives you the necessary time to respond safely to unexpected situations, such as sudden stops, obstacles, or hazards. This reaction time is crucial in preventing accidents and maintaining safety while driving.

For example, if a vehicle in front of you were to stop abruptly, having a safe following distance allows you to slow down or stop without colliding. It supports safe driving practices by minimizing the chance of rear-end collisions. This principle is especially important for larger vehicles like trucks, which require longer stopping distances due to their weight and size.

The other options don't directly address the critical safety aspect of reaction time as the main goal of maintaining following distance. While maintaining speed, improving visibility, and allowing for lane changes are important aspects of driving, they do not capture the primary importance of having enough space to react effectively in various driving scenarios.