Two-second ruleWorldwide
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309. Two-second rule
The two-second rule is a simple method for estimating a safe following distance behind another vehicle. The driver chooses a fixed point beside the road and begins counting when the vehicle ahead passes that point. Their own vehicle should reach the same point at least two seconds later.
The two-second interval should be increased when road, weather or visibility conditions are poor, because rain, snow, ice or reduced grip can significantly increase the distance needed to stop.
Wikimedia.org • Marc Mongenet • CC BY-SA
What is the two-second rule?
The two-second rule is a method for checking whether you are leaving enough following distance behind the vehicle ahead.
How do you use the two-second rule?
Choose a fixed roadside point. When the vehicle ahead passes it, count two seconds. Your vehicle should not reach the same point before two seconds have passed.
Is two seconds always enough?
No. A greater following interval should be used when conditions such as rain, snow, ice, poor visibility or reduced tyre grip increase stopping distance.

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