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Difficulty: MediumSeparation Distances and the Two-Second Rule

A car is travelling in continuous rain where surface water significantly reduces tyre grip. To maintain a safe separation margin, what time gap should the driver allow between their car and the vehicle ahead?

  1. A
    At least two seconds
  2. At least four secondsAnswer
  3. C
    At least ten seconds
  4. D
    At least one second

Answer

At least four seconds
In good, dry conditions, drivers should maintain a gap of at least two seconds from the vehicle ahead. On wet roads, tyre friction is significantly reduced and stopping distances are doubled, meaning the separation gap must be doubled to at least four seconds.

Step-by-Step Solution

1
Identify the standard baseline separation distance in good driving conditions.
The baseline separation distance in dry conditions is at least two seconds.
This establishes the minimum time margin required for safe reaction and braking under normal grip.
2
Apply the wet weather multiplier to the baseline time gap.
Multiply the two-second gap by two to obtain four seconds.
Wet surfaces reduce tyre traction and approximately double total stopping distance.

Key Concept

Separation distances and wet weather multipliers
Estimated Time:45s
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Topics

Separation Distances and the Two-Second Rule

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