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Zorluk: ZorStopping and Following Distances

You are driving at 60 mph60\text{ mph} on a single carriageway where winter weather has caused widespread packed ice and snow on the road surface. In normal dry conditions at this speed, the UK Highway Code specifies a 2-second2\text{-second} time gap and a total stopping distance of 73 metres73\text{ metres} (240 feet240\text{ feet}). According to the Highway Code, what is the minimum safe following time gap you should maintain, and up to what distance can your total stopping distance increase in these icy conditions?

  1. A
    Maintain at least a 4-second4\text{-second} gap; stopping distance can increase up to 146 metres146\text{ metres} (480 feet480\text{ feet})
  2. Maintain at least a 20-second20\text{-second} gap; stopping distance can increase up to 730 metres730\text{ metres} (2,400 feet2,400\text{ feet})Cevap
  3. C
    Maintain at least a 10-second10\text{-second} gap; stopping distance can increase up to 365 metres365\text{ metres} (1,200 feet1,200\text{ feet})
  4. D
    Maintain at least a 20-second20\text{-second} gap; stopping distance can increase up to 568 metres568\text{ metres} (1,860 feet1,860\text{ feet}) because only braking distance is multiplied

Cevap

Maintain a following time gap of at least 20 seconds20\text{ seconds} and anticipate an overall stopping distance of up to 730 metres730\text{ metres} (2,400 feet2,400\text{ feet}).
According to the UK Highway Code, stopping distances on icy surfaces can be up to ten times greater than in dry conditions. Therefore, at 60 mph60\text{ mph}, the standard 73 metres73\text{ metres} (240 feet240\text{ feet}) stopping distance increases up to 730 metres730\text{ metres} (2,400 feet2,400\text{ feet}), and the standard 2-second2\text{-second} time gap must be extended up to 20 seconds20\text{ seconds}.

Adım Adım Çözüm

1
Identify the baseline dry-road stopping distance and following time gap at 60 mph60\text{ mph}
The baseline dry stopping distance is 73 metres73\text{ metres} (240 feet240\text{ feet}) and the standard time gap is 2 seconds2\text{ seconds}.
This establishes the standard reference values specified in the UK Highway Code.
2
Apply the official weather multiplier for icy and snowy road conditions to the overall stopping distance
73 metres×10=730 metres73\text{ metres} \times 10 = 730\text{ metres} (or 240 feet×10=2,400 feet240\text{ feet} \times 10 = 2,400\text{ feet}).
The Highway Code states that stopping distances on ice and snow can increase by up to ten times.
3
Scale the required separation time gap by the same factor of ten
2 seconds×10=20 seconds2\text{ seconds} \times 10 = 20\text{ seconds}.
The separation margin must be increased up to ten times to provide sufficient time to react and stop safely on extremely slippery surfaces.

Anahtar Kavram

Adjusting separation distances and stopping distance expectations in icy driving conditions
Tahmini Süre:1m 30s
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Konular

Stopping and Following Distances

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