The three-second rule

The Three-Second Rule is the simplest way to keep a safe distance from the car in front. You choose a fixed point on the road, and when the car ahead passes it, you count slowly to three. If you pass the point before you finish counting, you are too close.

How the Rule Works

Three seconds gives enough margin under normal conditions on a dry road with good visibility. The rule works regardless of speed because the distance in meters automatically increases the faster you drive.

When You Should Increase to Four or Five Seconds

• Wet conditions result in longer braking distance , and you should count to at least four.
• Slippery winter conditions often require five seconds or more. See winter driving and slippery conditions .
• Poor visibility in rain, fog, or darkness means you notice hazards later. Read about night driving and visibility .
• Heavy traffic with frequent speed changes requires extra buffer.

The Three-Second Rule in Numbers

Compare with the stopping distance in the table for calculation of stopping distance . At 80 km/h on a dry road, the stopping distance is approx. 88 m, which means three seconds gives you just enough margin.

Common Mistakes

• Counting too fast. Use the “one-thousand-and-one” method to ensure the right pace.
• Forgetting to adjust for conditions. The rule is a minimum, not a fixed limit.
• Driving too close in traffic. Even at low speeds, you need time to react, especially in the case of distractions .

Further Reading

• Calculation of stopping distance
• Speed and weather conditions
• Adjusted speed and hidden hazards
• Speed limits and speed rules