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Difficulty: EasyAdjusting Margins in Wet Weather

According to the Highway Code, how does driving on a wet road surface affect your vehicle's overall stopping distance compared to dry conditions?

  1. It is at least double the distance required on dry roadsAnswer
  2. B
    It is up to ten times greater than on dry roads
  3. C
    It is reduced by half because water cools the brake components
  4. D
    It remains unchanged because modern braking systems fully eliminate water effects

Answer

It is at least double the distance required on dry roads
In wet weather, tyres have less grip on the road surface, which increases braking distance. The Highway Code explicitly states that overall stopping distances are at least double those required on dry roads.

Step-by-Step Solution

1
Identify the environmental condition and road surface state described
The vehicle is travelling on a wet road surface during or after rainfall.
Rainwater creates a film between the tyre tread and the road, significantly reducing tyre grip.
2
Apply the standard Highway Code rule for stopping margins on wet roads
Stopping distances are at least double the distance required on a dry road.
Lower surface friction increases the braking distance component of the overall stopping distance.

Key Concept

Highway Code stopping distance adjustment on wet road surfaces
Estimated Time:45s
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Topics

Adjusting Margins in Wet Weather

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