How to Drive Handbook Practice Test 2026 - Free Driving Practice Questions and Study Guide

The rule is a practical guideline for following distance to give you enough time to react and stop if the vehicle ahead suddenly slows or stops. In normal driving conditions, you should maintain at least three seconds of space behind the car in front. A simple way to apply it is to pick a fixed object ahead on the road; when the vehicle in front passes that object, you should be able to start counting to three before your car reaches that same object. If you reach the object before you finish counting, you’re too close and should increase the gap.

If weather or visibility is poor, you should increase that spacing beyond three seconds to compensate for longer stopping distances and slower reaction times. This rule isn’t about timing how long to wait at a green light, nor is it a measure of stopping distance after a brief delay, and it isn’t a method for estimating arrival time. It’s a safer-following-distance guideline that you adjust with conditions to help prevent rear-end collisions.