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Module 8: Speed limits and safe following distances

The two-second and four-second rules

5 minLesson 2 of 2 Awaiting expert reviewLast reviewed: 29 September 2026

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What you will learn

Keep a safe following distance using the two-second and four-second rules.

  • How to count two seconds
  • When to use four seconds

The two-second rule

Safe-driving advice

In good conditions, keep at least a two-second gap behind the vehicle in front. Pick a fixed object like a power pole. When the car ahead passes it, count 'one thousand and one, one thousand and two'. If you reach the object before you finish, you're too close.

Pole2 seconds (4 in the wet)
Two cars pass the same power pole. The gap between them takes two seconds to cover.

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The four-second rule

Safe-driving advice

In wet or icy conditions, or when visibility is poor, double the gap to at least four seconds.

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Knowledge check

A few quick questions – no timer, no pressure.

Question 1 of 2Original practice question

In good conditions, what is the minimum following distance recommended by the ?

Pole2 seconds (4 in the wet)
A two-second gap between two cars.

Summary

  • 2 seconds in good conditions.
  • 4 seconds in wet, icy or poor visibility.

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Sources Awaiting expert reviewLast checked: 29 September 2026

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