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
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.
🔗 gov.uk • Great Britain Highway Code, Rules 226–237, wet/icy visibility; national guidance example
🔗 gov.uk • Great Britain Highway Code, Annex 6, tyres and brakes; national guidance example

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