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Zorluk: KolayStopping Distances

According to The Highway Code, under good, dry road conditions and normal driver reaction times, what is the total stopping distance in metres for a vehicle travelling at 20 mph20\text{ mph} (32 km/h32\text{ km/h})?

Cevap: 12 metres

Cevap

The total stopping distance at 20 mph20\text{ mph} under dry conditions is 12 metres12\text{ metres}.
Under normal, dry driving conditions, The Highway Code specifies that at 20 mph20\text{ mph} (32 km/h32\text{ km/h}), thinking distance is 6 metres6\text{ metres} and braking distance is 6 metres6\text{ metres}. Summing these components gives an overall stopping distance of 12 metres12\text{ metres} (40 feet40\text{ feet}).

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1
Determine the thinking distance component at 20 mph20\text{ mph}
Thinking distance is 6 metres6\text{ metres}
At 20 mph20\text{ mph}, a driver with an average reaction time travels 6 metres6\text{ metres} before physically applying the brakes.
2
Determine the braking distance component at 20 mph20\text{ mph}
Braking distance is 6 metres6\text{ metres}
Under dry conditions with effective brakes and tyres, the car takes 6 metres6\text{ metres} to decelerate to a complete stop once the brakes are engaged.
3
Calculate the total stopping distance by adding both components
6 m+6 m=12 metres6\text{ m} + 6\text{ m} = 12\text{ metres}
Total stopping distance is defined as the sum of thinking distance and braking distance.

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Total Stopping Distance calculation at 20 mph under normal dry conditions
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Stopping Distances

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