What is the proper following distance behind another vehicle?

Maintaining a proper following distance behind another vehicle is crucial for safe driving. The correct answer, which indicates a following distance of at least three seconds under normal conditions, is based on the need for sufficient reaction time and safe stopping distance.

A three-second gap allows drivers to react to sudden stops or emergencies. To assess this distance while driving, you can use a fixed point on the road, such as a sign or an overpass. When the vehicle in front of you passes that point, count "one thousand one, one thousand two, one thousand three." If you reach the fixed point before finishing the count, you need to increase your distance to ensure a safer following distance.

This recommendation is particularly applicable under normal driving conditions, which would not include adverse weather, heavy traffic, or other specific conditions that can necessitate increased spacing. In such situations, it is often advised to extend the following distance to four seconds or more to accommodate additional stopping time required due to reduced traction or visibility.