On a dry road, what is the recommended gap to maintain from the vehicle in front?

Maintaining a 2-second gap from the vehicle in front on a dry road is based on the principle of providing enough distance to react to sudden stops or changes in traffic conditions. This distance allows for a safe buffer that accommodates average reaction times and ensures that drivers have sufficient space to stop without colliding with the vehicle ahead.

The 2-second rule is derived from the time it takes for a driver to perceive a hazard, make a decision, and then apply the brakes. In practical terms, if a driver chooses a fixed point on the road and counts the seconds until they reach that point after the vehicle in front has passed it, a 2-second gap is generally adequate under normal driving conditions. This helps to reduce the risk of rear-end collisions, which can occur if a driver is tailgating or if they are too close to the vehicle ahead.

In contrast, shorter gaps may not provide enough time to react safely, especially if the leading vehicle suddenly brakes. Longer gaps, while safer, can be impractical in certain traffic situations where maintaining a flow is necessary. Thus, 2 seconds strikes a balance between safety and practicality for most driving scenarios on dry roads.