How effective is a 2 second following distance for braking?

A 2-second following distance is typically considered too short for safe braking, especially in situations where quick stops may be necessary. This following distance may not provide adequate time to react, particularly under conditions that demand sudden stops, such as unexpected obstacles, sudden changes in traffic speed, or adverse weather situations like rain or snow.

A safe following distance generally allows for the perception-reaction time in addition to the braking distance required to stop safely. The most commonly recommended safe following distance is around 3 to 4 seconds under normal driving conditions. This longer distance provides drivers with extra time to respond to potential hazards, keeping them and others on the road safe.

In different weather conditions, such as rain or fog, the recommended following distance may increase even further to account for reduced traction and visibility. Therefore, relying on only a 2-second gap can compromise safety, as it does not accommodate the necessary factors for safe braking in various driving scenarios.