What is the proper following distance behind another vehicle?

Answer: C — At least three seconds

The proper following distance behind another vehicle is at least three seconds. This guideline helps ensure that a driver has enough time to react in case the vehicle in front suddenly stops or slows down. Maintaining a three-second gap allows adequate time to assess the situation ahead, respond to changes, and stop safely if necessary. This distance can be measured by choosing a fixed point on the road, such as a sign or a tree. When the rear bumper of the vehicle in front passes that point, the driver should count for three seconds before reaching the same point. Adjustments to this distance may be necessary under adverse conditions, such as rain, fog, or when driving a larger vehicle, in which case a longer following distance is recommended for safety.