What distance should you maintain between you and the vehicle ahead of you?

Maintaining a safe following distance is crucial for road safety, and the guideline of at least one car length for every 10 mph of speed is a practical and effective rule of thumb. This distance allows for ample reaction time in the event that the vehicle in front suddenly stops or slows down. For instance, if you are traveling at 40 mph, having about four car lengths between you and the vehicle ahead gives you a better cushion to react to any unforeseen circumstances.

This guideline is based on general driving experience and helps ensure that drivers can maintain control and avoid collisions. Adequate following distance varies depending on speed and driving conditions, but the one car length per 10 mph simplifies the concept and makes it easier for drivers to remember and apply in real-life situations.

The other options present different measures that do not adequately account for varying speeds and may lead to unsafe driving conditions. It's essential for drivers to understand this rule and use it as a basis for safe driving practices.