A car is travelling at 70\text{ mph} along a dual carriageway during continuous rain. Acco… — UK Driving Theory Test

A car is travelling at $70\text{ mph}$ along a dual carriageway during continuous rain. According to The Highway Code, stopping distances on wet roads are at least double those on dry roads. What is the minimum total stopping distance, in metres, required for the vehicle to come to a complete stop?

Answer: 192 metres

Answer

192 metres

According to The Highway Code, a vehicle travelling at

70\text{ mph}

on dry asphalt requires a thinking distance of

21\text{ metres}

and a braking distance of

75\text{ metres}

, giving a total stopping distance of

96\text{ metres}

. In wet weather conditions, overall stopping distances are at least doubled, resulting in a minimum stopping distance of

96\text{ m} \times 2 = 192\text{ metres}

(

630\text{ feet}

Step-by-Step Solution

Identify the standard Highway Code stopping distance components at

70\text{ mph}

on a dry road.

Thinking distance =

21\text{ metres}

; Braking distance =

75\text{ metres}

The Highway Code defines baseline stopping distances for each speed bracket under normal dry conditions.

Calculate the total stopping distance on dry asphalt by adding thinking distance and braking distance.

21\text{ m} + 75\text{ m} = 96\text{ metres}

(

315\text{ feet}

Total stopping distance is always the sum of thinking distance and braking distance.

Apply the wet weather multiplier to the dry stopping distance.

96\text{ m} \times 2 = 192\text{ metres}

(

630\text{ feet}

The Highway Code states that stopping distances on wet roads are at least double those required on dry roads due to reduced tyre grip and friction.

Key Concept

Highway Code stopping distances at

70\text{ mph}

and the doubling factor in wet weather conditions

Estimated Time:1m 15s

Question

Answer

Step-by-Step Solution

Key Concept

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