How can you ensure you maintain a safe following distance?

The correct choice emphasizes the importance of using the 4-second rule under normal conditions to maintain a safe following distance. The 4-second rule provides drivers with a sufficient margin to react and stop safely if the vehicle in front of them suddenly slows down or stops. By counting four seconds from the time the vehicle ahead passes a reference point until your vehicle reaches the same point, drivers can ensure they have adequate space to react and avoid collisions.

This approach is based on recognizing that different conditions, such as road surface, weather, and traffic, can significantly impact stopping distances. By adhering to the 4-second rule under typical driving conditions, drivers increase their safety and that of others on the road.

In contrast, options that suggest a 2-second rule under all conditions are too brief, especially in adverse weather or heavy traffic scenarios where increased distance is necessary. Tailgating not only endangers your safety but also creates unpredictable driving situations, while driving at a constant speed without checking your distance neglects the dynamic nature of road conditions.