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Zorluk: OrtaAdjusting Margins in Wet Weather

You are travelling on a single carriageway behind a large vehicle during steady rain. Why should you drop back and maintain a time gap of at least four seconds?

  1. A
    To double your thinking distance so your reaction time increases in hazardous weather
  2. To stay out of the vehicle's spray and give sufficient space to stop, as wet roads double braking distanceCevap
  3. C
    To match the ten-times separation margin required when road surfaces become slippery
  4. D
    To allow you to brake heavily in an emergency without needing to correct for aquaplaning

Cevap

To stay out of the vehicle's spray and give sufficient space to stop, as wet roads double braking distance.
On wet roads, reduced friction between tyres and asphalt doubles braking distance compared to dry roads. Increasing the following gap from the standard two seconds to at least four seconds ensures sufficient stopping space and keeps the driver clear of blinding spray thrown up by the wheels of large vehicles.

Adım Adım Çözüm

1
Identify the standard following distance in dry conditions
The minimum recommended following gap in normal, dry conditions is 2 seconds.
This establishes the baseline safety margin under normal traction.
2
Apply the wet-weather adjustment factor from the Highway Code
In wet conditions, stopping distances increase significantly because tyre grip is reduced, doubling braking distance.
Drivers must double the separation gap from 2 seconds to at least 4 seconds.
3
Account for environmental hazards specific to following large vehicles
Large vehicles generate substantial road spray, which impairs forward visibility unless a greater trailing distance is maintained.
Dropping back beyond the 4-second minimum provides clearer vision and ample time to anticipate hazards.

Anahtar Kavram

Adjusting safety margins and separation distances in wet weather
Tahmini Süre:1m 0s
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Adjusting Margins in Wet Weather

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