You are driving at a steady speed of 30\text{ mph} on a dry, level road in good driving co… — UK Driving Theory Test

You are driving at a steady speed of $30\text{ mph}$ on a dry, level road in good driving conditions. According to the UK Highway Code, what is the typical breakdown of your vehicle's thinking distance, braking distance, and overall stopping distance?

A
Thinking distance of $14\text{ metres}$ ( $45\text{ feet}$ ), braking distance of $9\text{ metres}$ ( $30\text{ feet}$ ), giving an overall stopping distance of $23\text{ metres}$ ( $75\text{ feet}$ )
Thinking distance of $9\text{ metres}$ ( $30\text{ feet}$ ), braking distance of $14\text{ metres}$ ( $45\text{ feet}$ ), giving an overall stopping distance of $23\text{ metres}$ ( $75\text{ feet}$ )Answer
C
Thinking distance of $9\text{ metres}$ ( $30\text{ feet}$ ), braking distance of $28\text{ metres}$ ( $90\text{ feet}$ ), giving an overall stopping distance of $37\text{ metres}$ ( $120\text{ feet}$ )
D
Thinking distance of $6\text{ metres}$ ( $20\text{ feet}$ ), braking distance of $6\text{ metres}$ ( $20\text{ feet}$ ), giving an overall stopping distance of $12\text{ metres}$ ( $40\text{ feet}$ )

Answer

Thinking distance of

9\text{ metres}

(

30\text{ feet}

), braking distance of

14\text{ metres}

(

45\text{ feet}

), giving an overall stopping distance of

23\text{ metres}

(

75\text{ feet}

)

According to the UK Highway Code, total stopping distance equals thinking distance plus braking distance. At

30\text{ mph}

on a dry road, typical thinking distance is

9\text{ metres}

(

30\text{ feet}

) and braking distance is

14\text{ metres}

(

45\text{ feet}

), giving a total stopping distance of

23\text{ metres}

(

75\text{ feet}

Step-by-Step Solution

Identify the vehicle speed and road conditions from the scenario

Speed is

30\text{ mph}

under normal, dry conditions

Stopping distance calculations in the UK Highway Code depend on both vehicle speed and surface grip

Determine the thinking distance component at

30\text{ mph}

Thinking distance is

9\text{ metres}

(

30\text{ feet}

)

Thinking distance is the distance covered from the moment a hazard is perceived until the brakes are applied

Determine the braking distance and combine with thinking distance

Braking distance is

14\text{ metres}

(

45\text{ feet}

), yielding a total stopping distance of

9\text{ m} + 14\text{ m} = 23\text{ metres}

(

75\text{ feet}

)

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

Key Concept

Highway Code stopping distance breakdown at 30 mph

Estimated Time:45s

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