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Zorluk: OrtaFactors Affecting Braking Distance

A passenger car is travelling at a constant speed of 60 mph60\text{ mph} (96 km/h96\text{ km/h}) on a dry, level tarmac road, where its standard braking distance is 55 metres55\text{ metres}. Heavy rainfall subsequently coats the road surface with water, reducing tyre grip. According to The Highway Code, what is the vehicle's expected braking distance in metres under these wet road conditions?

Cevap: 110 metres

Cevap

110 metres
Under Rule 126 and the general guidance of The Highway Code, wet weather significantly reduces tyre grip, requiring at least double (2×2\times) the standard dry braking distance. At 60 mph60\text{ mph}, the dry braking distance is 55 metres55\text{ metres}, making the wet braking distance 55 metres×2=110 metres55\text{ metres} \times 2 = 110\text{ metres}.

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1
Determine the standard braking distance on a dry surface
Braking distance on dry road = 55 metres55\text{ metres}
The baseline braking distance for a vehicle travelling at 60 mph60\text{ mph} under ideal dry conditions is 55 metres55\text{ metres} (180 feet180\text{ feet}).
2
Apply the wet road surface multiplier factor
Multiplier = 2×2\times
Water between the tyre tread and road surface reduces friction, which doubles the required braking distance under UK Highway Code rules.
3
Calculate the resulting wet braking distance
55 m×2=110 metres55\text{ m} \times 2 = 110\text{ metres}
Multiplying the baseline dry braking distance by the wet road multiplier provides the total distance covered while decelerating to a complete stop.

Anahtar Kavram

Effect of wet road surfaces on vehicle braking distance
Tahmini Süre:1m 0s
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Factors Affecting Braking Distance

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