Which of the following is considered a safe following distance under normal conditions?

The recommendation of maintaining a following distance of two seconds behind the vehicle in front is based on established safe driving practices. This time-based measure allows for a greater margin of safety in various driving conditions, providing enough time for the driver to react to unexpected situations, such as sudden stops or emergencies.

By counting two seconds from the time the vehicle in front passes a fixed point to when you reach the same point, you ensure that you have an adequate space cushion. This method also accounts for different speeds and stopping distances, making it a reliable practice regardless of the weather or road conditions.

Conversely, one car length may not provide sufficient space, especially at higher speeds, as stopping distance increases with speed. Similarly, five car lengths may be too excessive in normal conditions and lead to unnecessary congestion. Finally, just enough to see the vehicle's rear lights does not quantify a safe distance and could be misleading, especially in conditions where visibility or braking distances may be compromised.