According to the UK Highway Code, the overall stopping distance for a car travelling at 30… — UK Driving Theory Test

According to the UK Highway Code, the overall stopping distance for a car travelling at $30\text{ mph}$ in dry conditions is $23\text{ metres}$ . Because tyre grip is reduced in wet weather, stopping distances are at least double those on a dry road. What is the minimum overall stopping distance, in metres, for a car travelling at $30\text{ mph}$ on a wet road?

Answer: 46 metres

Answer

The minimum overall stopping distance on a wet road at

30\text{ mph}

46\text{ metres}

Under Rule 126 and Rule 227 of the UK Highway Code, stopping distances in wet weather are at least double those on dry roads. For a car travelling at

30\text{ mph}

, the standard dry stopping distance is

23\text{ metres}

(

75\text{ feet}

). Multiplying this figure by

2

gives a wet stopping distance of

46\text{ metres}

(

150\text{ feet}

Step-by-Step Solution

Determine the dry stopping distance for a vehicle travelling at

30\text{ mph}

Dry stopping distance is

23\text{ metres}

(composed of

9\text{ metres}

thinking distance and

14\text{ metres}

braking distance).

The baseline dry road stopping distance is required before applying weather condition multipliers.

Apply the wet weather distance multiplier mandated by the UK Highway Code.

Multiply the dry distance by

2

23\text{ m} \times 2 = 46\text{ m}

Water on the road reduces tyre adhesion and increases braking distance, causing total stopping distance to at least double in wet conditions.

Key Concept

The UK Highway Code specifies that stopping distances at least double on wet roads compared to dry conditions.

Estimated Time:45s

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