All practice questions

Question 1Question →

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 $20\text{ mph}$ ( $32\text{ km/h}$ )?

Show answer & explanation

Answer: 12

Answer

The total stopping distance at

20\text{ mph}

under dry conditions is

12\text{ metres}

.

Under normal, dry driving conditions, The Highway Code specifies that at

20\text{ mph}

(

32\text{ km/h}

), thinking distance is

6\text{ metres}

and braking distance is

6\text{ metres}

. Summing these components gives an overall stopping distance of

12\text{ metres}

(

40\text{ feet}

).

Step-by-Step Solution

1

Determine the thinking distance component at

20\text{ mph}

Thinking distance is

6\text{ metres}

At

20\text{ mph}

, a driver with an average reaction time travels

6\text{ metres}

before physically applying the brakes.

2

Determine the braking distance component at

20\text{ mph}

Braking distance is

6\text{ metres}

Under dry conditions with effective brakes and tyres, the car takes

6\text{ metres}

to decelerate to a complete stop once the brakes are engaged.

3

Calculate the total stopping distance by adding both components

6\text{ m} + 6\text{ m} = 12\text{ metres}

Total stopping distance is defined as the sum of thinking distance and braking distance.

Key Concept

Total Stopping Distance calculation at 20 mph under normal dry conditions

Estimated Time:45s

Question 2Question →

On a dry road surface, a car travelling at 40 mph has an average braking distance of 24 metres. According to the Highway Code, wet road conditions reduce tyre grip such that braking distance is at least double that on a dry road. What is the estimated braking distance, in metres, when stopping on a wet road from the same speed?

Show answer & explanation

Answer: 48

Answer

48 metres

According to the Highway Code, surface water reduces tyre adhesion, causing the braking distance on wet roads to be at least double that on dry roads. Multiplying the dry braking distance of 24 metres by 2 results in 48 metres.

Step-by-Step Solution

1

Identify the dry road braking distance and the relevant environmental multiplier.

Baseline dry braking distance = 24 metres; wet road multiplier = 2

The Highway Code establishes that wet conditions reduce surface friction, doubling the distance required to bring the vehicle to a stop once brakes are applied.

2

Multiply the baseline braking distance by the wet road multiplier.

24 \times 2 = 48 \text{ metres}

Multiplying the dry distance by 2 gives the minimum expected braking distance on a wet surface.

Key Concept

Braking distance is at least doubled on wet roads compared to dry roads due to reduced tyre-to-road friction.

Estimated Time:30s

Question 3Question →

A car is travelling at $60\text{ mph}$ ( $96\text{ km/h}$ ) on a dry, level road under good driving conditions. According to The Official Highway Code, what is the vehicle's total stopping distance in metres?

Show answer & explanation

Answer: 73

Answer

73 metres

According to The Official Highway Code, a vehicle travelling at

60\text{ mph}

has a thinking distance of

18\text{ metres}

and a braking distance of

55\text{ metres}

, giving a total stopping distance of

73\text{ metres}

(

240\text{ feet}

).

Step-by-Step Solution

1

Determine the thinking distance for a vehicle travelling at

60\text{ mph}

.

18\text{ metres}

(

60\text{ feet}

)

At

60\text{ mph}

, the driver covers

18\text{ metres}

during reaction time before physical brakes take effect.

2

Determine the braking distance for a vehicle travelling at

60\text{ mph}

on a dry road.

55\text{ metres}

(

180\text{ feet}

)

Under dry, optimal conditions, the car requires

55\text{ metres}

to decelerate to a complete stop.

3

Add the thinking distance and braking distance together.

18\text{ m} + 55\text{ m} = 73\text{ metres}

(

240\text{ feet}

)

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

Key Concept

Highway Code stopping distance at 60 mph

Alternative Method

Convert speed directly using the Highway Code reference pattern: at

60\text{ mph}

, thinking distance in feet equals the speed value in feet (

60\text{ ft} = 18\text{ m}

), and braking distance in feet is calculated by multiplying speed by an increasing factor (

60 \times 3 = 180\text{ ft} = 55\text{ m}

), resulting in

240\text{ ft} = 73\text{ m}

.

Estimated Time:1m 0s

Question 4Question →

A car travelling at 40 mph on a dry road has an average total stopping distance of 36 metres. According to the Highway Code, stopping distances in wet conditions are at least double those on dry surfaces. What is the minimum total stopping distance, in metres, that the driver should anticipate on a wet road at this speed?

Show answer & explanation

Answer: 72

Answer

72 metres

According to the Highway Code, wet road conditions reduce tyre grip, meaning overall stopping distances are at least double those on dry roads. For a car travelling at 40 mph with a dry stopping distance of 36 metres, the minimum stopping distance in wet weather is 36 × 2 = 72 metres.

Step-by-Step Solution

1

Identify the standard total stopping distance on a dry road at 40 mph.

Dry stopping distance = 36 metres.

This establishes the baseline stopping distance before adjusting for wet weather.

2

Apply the wet weather multiplier defined in the Highway Code.

Wet weather multiplier = 2.

Reduced tyre grip on wet road surfaces increases stopping distances to at least double normal dry figures.

3

Multiply the dry stopping distance by the wet weather factor of 2.

36 metres × 2 = 72 metres.

Calculates the total minimum stopping distance expected in wet conditions.

Key Concept

Highway Code stopping distance adjustment in wet weather

Estimated Time:45s

Question 5Question →

A vehicle is travelling at a constant speed of 70 mph on a motorway during rainfall with surface water present. Under standard dry conditions at this speed, the Highway Code establishes a thinking distance of 21 metres and a braking distance of 75 metres. In wet conditions, the distance required to brake to a complete stop doubles, while driver reaction time and thinking distance remain unchanged. What is the total stopping distance, in metres, required for the vehicle to stop safely under these wet conditions?

Show answer & explanation

Answer: 171

Answer

171 metres

Under wet road conditions, tyre friction is significantly diminished, which doubles the distance covered once the brakes are applied from 75 metres to 150 metres. Because the vehicle's speed is unchanged and driver reaction time remains standard, thinking distance remains 21 metres. Combining the 21 metres of thinking distance with the 150 metres of wet braking distance results in a total stopping distance of 171 metres.

Step-by-Step Solution

1

Identify the thinking distance and dry braking distance at 70 mph

Thinking distance = 21 metres; Dry braking distance = 75 metres

Total stopping distance is comprised of thinking distance plus braking distance.

2

Calculate the wet braking distance by multiplying the dry braking distance by 2

75\text{ m} \times 2 = 150\text{ metres}

Wet road surfaces reduce tyre grip and friction, causing the braking distance to double.

3

Sum the unchanged thinking distance and the new wet braking distance

21\text{ m} + 150\text{ m} = 171\text{ metres}

Thinking distance is determined by human perception and reaction time at a given speed and does not change due to wet road conditions.

Key Concept

In wet weather, braking distance doubles due to reduced tyre friction, while thinking distance remains unaffected at the same speed.

Estimated Time:1m 30s

Question 6Question →

A motorist travels at 40 mph on a dual carriageway during persistent rain. Under standard dry conditions, stopping safely from 40 mph requires a thinking distance of 12 metres and a braking distance of 24 metres. In accordance with the Highway Code's rules for driving in wet weather, what is the total stopping distance, in metres, required to bring the vehicle to a complete standstill?

Show answer & explanation

Answer: 60

Answer

60 metres

In wet weather, reduced road friction causes the braking distance to double from

24\text{ m}

to

48\text{ m}

. The thinking distance remains unchanged at

12\text{ m}

. Summing the thinking distance and the wet braking distance yields a total stopping distance of

12\text{ m} + 48\text{ m} = 60\text{ m}

.

Step-by-Step Solution

1

Calculate the braking distance on a wet road surface

48 metres (

24\text{ m} \times 2 = 48\text{ m}

)

The Highway Code establishes that wet conditions reduce tyre adhesion, causing braking distance to be twice as long as on a dry road.

2

Add the thinking distance to the adjusted wet braking distance

60 metres (

12\text{ m} + 48\text{ m} = 60\text{ m}

)

Thinking distance depends strictly on driver reaction time and vehicle speed, meaning it remains 12 metres regardless of the road surface.

Key Concept

In wet weather, braking distance is multiplied by two due to reduced tyre grip, whereas thinking distance remains unaffected.

Estimated Time:1m 0s

Question 7Question →

According to the official UK Highway Code, what is the total stopping distance in metres for a car travelling at $40\text{ mph}$ on a dry, well-maintained road?

Show answer & explanation

Answer: 36

Answer

The total stopping distance at

40\text{ mph}

is

36\text{ metres}

(

120\text{ feet}

).

At

40\text{ mph}

, a vehicle travels

12\text{ metres}

during the driver's reaction time (thinking distance) and an additional

24\text{ metres}

once the brakes are applied (braking distance) under normal dry conditions. Combining these gives a total stopping distance of

36\text{ metres}

(

120\text{ feet}

).

Step-by-Step Solution

1

Determine the thinking distance at

40\text{ mph}

12\text{ metres}

Under Highway Code guidelines, thinking distance in metres at

40\text{ mph}

is

12\text{ metres}

.

2

Determine the braking distance at

40\text{ mph}

24\text{ metres}

Under Highway Code guidelines, braking distance on a dry road at

40\text{ mph}

is

24\text{ metres}

.

3

Add the thinking distance and braking distance together

12\text{ m} + 24\text{ m} = 36\text{ metres}

Total stopping distance is defined as the sum of thinking distance and braking distance.

Key Concept

Total stopping distance equals thinking distance plus braking distance as specified in the Highway Code.

Estimated Time:45s

Question 8Question →

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?

Show answer & explanation

Answer: 192

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

1

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.

2

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.

3

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 9Question →

You are driving at a speed of $40\text{ mph}$ ( $64\text{ km/h}$ ) on a wet road surface. According to The Highway Code, the standard thinking distance at this speed is $12\text{ metres}$ ( $40\text{ feet}$ ) and the braking distance on a dry road is $24\text{ metres}$ ( $80\text{ feet}$ ). In wet weather, total stopping distances are at least double those on dry roads. What is the minimum total stopping distance, in metres, required to stop safely under these wet conditions?

Show answer & explanation

Answer: 72

Answer

The minimum total stopping distance in wet conditions at

40\text{ mph}

is

72\text{ metres}

.

Under dry conditions at

40\text{ mph}

, thinking distance is

12\text{ metres}

and braking distance is

24\text{ metres}

, giving a baseline dry stopping distance of

36\text{ metres}

(

120\text{ feet}

). According to The Official Highway Code Rule 126, stopping distances in wet conditions are at least double those on dry roads, resulting in a total of

36\text{ metres} \times 2 = 72\text{ metres}

(

240\text{ feet}

).

Step-by-Step Solution

1

Calculate the total stopping distance on a dry road

12\text{ m} + 24\text{ m} = 36\text{ metres}

Total stopping distance equals thinking distance plus braking distance under normal dry conditions.

2

Apply the Highway Code wet weather multiplier to the dry stopping distance

36\text{ m} \times 2 = 72\text{ metres}

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

Key Concept

Highway Code stopping distances under adverse weather conditions

Estimated Time:1m 30s

Question 10Question →

A driver travelling at $50\text{ mph}$ ( $80\text{ km/h}$ ) along a dry dual carriageway needs to perform an emergency stop. According to The Highway Code, what is the total stopping distance in metres (combining thinking and braking distances) for this vehicle?

Show answer & explanation

Answer: 53

Answer

53\text{ metres}

According to The Official Highway Code, a vehicle travelling at

50\text{ mph}

(

80\text{ km/h}

) has a thinking distance of

15\text{ metres}

(

50\text{ feet}

) and a braking distance of

38\text{ metres}

(

125\text{ feet}

), giving an overall stopping distance of

53\text{ metres}

(

175\text{ feet}

).

Step-by-Step Solution

1

Identify the standard thinking distance at

50\text{ mph}

(

80\text{ km/h}

)

15\text{ metres}

(

50\text{ feet}

)

At

50\text{ mph}

, the distance travelled during normal reaction time before applying the brakes is

15\text{ metres}

.

2

Identify the standard braking distance at

50\text{ mph}

(

80\text{ km/h}

)

38\text{ metres}

(

125\text{ feet}

)

On a dry, level road with good tyres and brakes, the distance required to decelerate to a complete standstill from

50\text{ mph}

is

38\text{ metres}

.

3

Sum the thinking and braking distances to calculate total stopping distance

15\text{ m} + 38\text{ m} = 53\text{ metres}

(

175\text{ feet}

)

Total stopping distance equals thinking distance plus braking distance.

Key Concept

Highway Code stopping distance breakdown at

50\text{ mph}

on dry roads

Estimated Time:45s

Question 11Question →

According to The Highway Code, total stopping distance consists of thinking distance plus braking distance. When driving a car at a speed of $20\text{ mph}$ ( $32\text{ km/h}$ ) on a dry road with good tyre and brake conditions, what is the total stopping distance in metres?

Show answer & explanation

Answer: 12

Answer

The total stopping distance is 12 metres.

Under normal, dry conditions as specified in The Highway Code, a car travelling at

20\text{ mph}

(

32\text{ km/h}

) has a thinking distance of

6\text{ metres}

(

20\text{ feet}

) and a braking distance of

6\text{ metres}

(

20\text{ feet}

). Adding these two values together gives a total stopping distance of

12\text{ metres}

(

40\text{ feet}

).

Step-by-Step Solution

1

Determine the thinking distance at 20 mph

Thinking distance = 6 metres (20 feet)

The Highway Code defines thinking distance at 20 mph under normal conditions as 6 metres.

2

Determine the braking distance at 20 mph

Braking distance = 6 metres (20 feet)

The Highway Code defines braking distance on a dry road at 20 mph as 6 metres.

3

Calculate the total stopping distance by adding thinking distance and braking distance

6 metres + 6 metres = 12 metres (40 feet)

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

Key Concept

Total Stopping Distance = Thinking Distance + Braking Distance

Estimated Time:1m 0s

Question 12Question →

In normal dry conditions, a passenger car travelling at 30 mph has an average total stopping distance of 23 metres (comprising 9 metres thinking distance and 14 metres braking distance). When travelling at this speed on a road surface made wet by rainfall, what is the minimum total stopping distance, in metres, that the driver must allow according to The Highway Code?

Show answer & explanation

Answer: 46

Answer

46 metres

According to The Highway Code (Rule 126), stopping distances on wet roads are at least double those required on dry roads because surface water reduces tyre grip and increases braking distance. Since the dry stopping distance at 30 mph is

23\text{ metres}

, the minimum stopping distance in wet weather is

23 \times 2 = 46\text{ metres}

.

Step-by-Step Solution

1

Identify the standard baseline stopping distance under dry conditions at 30 mph

Total dry stopping distance is

23\text{ metres}

(

9\text{ m}

thinking distance +

14\text{ m}

braking distance)

The baseline dry stopping distance provides the reference value established in The Highway Code.

2

Determine the required safety margin multiplier for wet weather conditions

The stopping distance multiplier is

2

The Highway Code Rule 126 states that overall stopping distances in wet conditions are at least double those on dry roads.

3

Calculate the minimum wet weather stopping distance

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

Doubling the total dry stopping distance gives the required safe margin in wet weather.

Key Concept

The Highway Code stipulates that overall stopping distances in wet conditions are at least double those required on dry roads.

Estimated Time:1m 0s

Question 13Question →

According to The Highway Code, a car travelling at 70 mph on a dry, level asphalt road has a thinking distance of 21 metres and an overall stopping distance of 96 metres. In wet weather conditions, reduced tyre grip on the road surface causes the vehicle's braking distance to double, while thinking distance remains unaffected. What is the vehicle's braking distance, in metres, when stopping from 70 mph on a wet road?

Show answer & explanation

Answer: 150

Answer

150 metres

On a dry road at 70 mph, the baseline braking distance is 75 metres (96 metres total stopping distance minus 21 metres thinking distance). Because wet road conditions double the braking distance due to reduced surface grip, the new braking distance is 75 metres multiplied by 2, which equals 150 metres.

Step-by-Step Solution

1

Determine the dry braking distance from the given overall stopping distance and thinking distance

Dry braking distance = 75 metres

Overall stopping distance equals thinking distance plus braking distance, so dry braking distance is calculated as 96 m - 21 m = 75 m.

2

Apply the wet road surface factor to the braking distance component

Wet braking distance = 150 metres

In wet conditions, reduced friction between tyres and the road surface doubles braking distance: 75 m × 2 = 150 m.

Key Concept

Braking distance is the distance a vehicle travels after the brakes are applied until it stops completely, and wet road surfaces double this distance due to reduced tyre-to-road friction.

Estimated Time:1m 30s

Question 14Question →

In normal dry conditions, a car travelling at $30\text{ mph}$ has an average total stopping distance of $23\text{ metres}$ . According to the Highway Code, stopping distances on icy surfaces can increase by up to $10$ times. What is the maximum overall stopping distance, in metres, that a driver should anticipate on an icy road at this speed?

Show answer & explanation

Answer: 230

Answer

The maximum overall stopping distance on an icy road is 230 metres.

Under the Highway Code, stopping distances on icy or snowy surfaces can be up to 10 times greater than on dry roads. For a car travelling at 30 mph with a baseline stopping distance of 23 metres, the overall stopping distance on ice can reach up to 230 metres (

23\text{ m} \times 10 = 230\text{ m}

).

Step-by-Step Solution

1

Note the standard overall stopping distance on dry asphalt at 30 mph.

Baseline stopping distance = 23 metres.

This serves as the standard baseline reference distance prior to applying adverse weather factors.

2

Identify the Highway Code stopping distance multiplier for packed ice and snow.

Multiplier = 10.

Tyre adhesion on ice is drastically reduced, requiring up to ten times the standard dry stopping distance.

3

Calculate the maximum expected stopping distance under icy conditions.

23 metres * 10 = 230 metres.

Multiplying the normal dry stopping distance by the adverse weather factor gives the total distance required to stop safely.

Key Concept

Highway Code stopping distance adjustment on ice and snow

Estimated Time:45s

Question 15Question →

You are driving a car along a dual carriageway in wet weather. According to the UK Highway Code, what is the minimum separation time gap, in seconds, you should maintain between your car and the vehicle travelling ahead?

Show answer & explanation

Answer: 4

Answer

4 seconds

According to the UK Highway Code (Rule 126), drivers should maintain at least a 2-second time gap in normal dry conditions. In wet weather, stopping distances are at least double those on dry roads, meaning the separation gap must be increased to at least 4 seconds.

Step-by-Step Solution

1

Identify the standard baseline time separation gap for good, dry road conditions.

The baseline separation time gap is 2 seconds.

The UK Highway Code establishes the 'two-second rule' as the safe minimum following gap under normal dry conditions.

2

Apply the wet weather multiplier to the baseline time gap.

Double the baseline gap: 2 seconds × 2 = 4 seconds.

Wet road surfaces reduce tyre friction and double overall stopping distances, requiring drivers to double the separation gap to at least 4 seconds.

Key Concept

Two-Second Rule and Wet Weather Following Distance

Estimated Time:30s

Question 16Question →

A motorist is driving on a dual carriageway behind another vehicle. Under dry weather conditions, the motorist maintains the minimum safe separation gap of 2 seconds as recommended by The Highway Code. When heavy rain begins, the motorist correctly doubles their following time gap to adjust for wet road conditions. As the journey continues into sub-zero temperatures, the road surface becomes covered in ice, requiring a following distance of up to 10 times the standard dry-weather gap. By how many seconds must the motorist increase their time separation gap when transitioning from wet road conditions to icy road conditions?

Show answer & explanation

Answer: 16

Answer

16 seconds

Under The Highway Code, the baseline separation gap in dry conditions is 2 seconds. On wet roads, this gap is doubled to 4 seconds. On icy roads, stopping distances can increase up to 10 times the dry baseline, requiring a 20-second gap. The increase needed when moving from wet conditions (4 seconds) to icy conditions (20 seconds) is 20 - 4 = 16 seconds.

Step-by-Step Solution

1

Determine the baseline minimum following distance in dry conditions according to The Highway Code.

2 seconds

The two-second rule specifies a minimum 2-second time gap between vehicles on dry roads.

2

Calculate the safe time gap required in wet weather.

4 seconds

In wet conditions, stopping distances double, so the time gap must be doubled (2 seconds × 2 = 4 seconds).

3

Calculate the safe time gap required in icy conditions.

20 seconds

On icy roads, stopping distances can increase up to 10 times the normal dry distance, requiring a gap of 20 seconds (2 seconds × 10 = 20 seconds).

4

Calculate the additional time gap needed when transitioning from wet to icy conditions.

16 seconds

Subtracting the wet weather gap from the icy road gap gives the required increase (20 seconds - 4 seconds = 16 seconds).

Key Concept

Application of weather-dependent time gap multipliers based on The Highway Code's two-second separation rule.

Estimated Time:1m 30s

Question 17Question →

A driver travelling on a dual carriageway at $50\text{ mph}$ encounters severe winter conditions where the road surface is covered with packed snow and ice. In standard dry conditions, the average total stopping distance is $53\text{ metres}$ at $50\text{ mph}$ and $12\text{ metres}$ at $20\text{ mph}$ . According to The Highway Code, stopping distances on ice can be up to $10\text{ times}$ greater than in dry conditions. If the driver slows down from $50\text{ mph}$ to $20\text{ mph}$ , by how many metres is their maximum potential stopping distance on ice reduced?

Show answer & explanation

Answer: 410

Answer

The maximum potential stopping distance on ice is reduced by

410\text{ metres}

.

According to The Highway Code (Rule 230), stopping distances in icy or snowy conditions can be up to ten times greater than on dry tarmac. At

50\text{ mph}

, a dry stopping distance of

53\text{ metres}

becomes up to

530\text{ metres}

on ice. At

20\text{ mph}

, a dry stopping distance of

12\text{ metres}

becomes up to

120\text{ metres}

on ice. Slowing down from

50\text{ mph}

to

20\text{ mph}

reduces the stopping distance by

530\text{ m} - 120\text{ m} = 410\text{ metres}

, drastically lowering collision risk.

Step-by-Step Solution

1

Determine the stopping distance on ice at

50\text{ mph}

530 metres

The Highway Code states that stopping distances on ice and snow can increase up to 10 times the normal dry stopping distance (

53\text{ m} \times 10 = 530\text{ m}

).

2

Determine the stopping distance on ice at the reduced speed of

20\text{ mph}

120 metres

Applying the 10-times multiplier to the baseline dry stopping distance of

12\text{ metres}

gives

12\text{ m} \times 10 = 120\text{ m}

.

3

Calculate the difference between the two stopping distances on ice

410 metres

Subtracting the stopping distance at

20\text{ mph}

from the stopping distance at

50\text{ mph}

yields the total reduction in safety margin:

530\text{ m} - 120\text{ m} = 410\text{ m}

.

Key Concept

Highway Code stopping distance multipliers and safety margin adjustments on ice and snow

Estimated Time:1m 30s

Question 18Question →

In normal dry conditions, the average total stopping distance for a car travelling at $50\text{ mph}$ is $53\text{ metres}$ . According to The Highway Code, what is the minimum total stopping distance, in metres, required when driving at the same speed on a wet road surface?

Show answer & explanation

Answer: 106

Answer

106\text{ metres}

According to The Highway Code (Rule 126), water on the road surface significantly reduces tyre grip, which means stopping distances in wet weather are at least double those on dry roads. For a car travelling at

50\text{ mph}

, the standard dry stopping distance of

53\text{ metres}

doubles to

106\text{ metres}

.

Step-by-Step Solution

1

Recall the Highway Code multiplier for stopping distances on wet roads

Multiplier is

2

(stopping distance doubles in wet weather)

Water on the road reduces friction and tyre grip, at least doubling overall stopping distances

2

Multiply the dry stopping distance (

53\text{ metres}

) by the wet condition factor (

2

)

53 \times 2 = 106\text{ metres}

To calculate the minimum total stopping distance required under wet conditions at

50\text{ mph}

Key Concept

Stopping distances in wet weather are at least double the normal dry road stopping distances.

Estimated Time:1m 0s

Question 19Question →

A car is travelling at the national speed limit of $70\text{ mph}$ ( $112\text{ km/h}$ ) along a dry, level motorway in clear weather conditions. According to The Highway Code, what is the vehicle's total stopping distance in metres?

Show answer & explanation

Answer: 96

Answer

96 metres

According to The Highway Code, at a speed of

70\text{ mph}

(

112\text{ km/h}

) on a dry road, thinking distance is

21\text{ metres}

(

70\text{ feet}

) and braking distance is

75\text{ metres}

(

245\text{ feet}

). Adding these together gives an overall stopping distance of

96\text{ metres}

(

315\text{ feet}

).

Step-by-Step Solution

1

Identify the thinking distance component at

70\text{ mph}

21\text{ metres}

The Highway Code establishes that at

70\text{ mph}

, reaction/thinking distance is

21\text{ metres}

(

70\text{ feet}

).

2

Identify the braking distance component at

70\text{ mph}

75\text{ metres}

Under dry, optimal road conditions, the distance travelled while braking from

70\text{ mph}

to a complete stop is

75\text{ metres}

(

245\text{ feet}

).

3

Calculate the total stopping distance by summing thinking and braking distances

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

Total stopping distance is defined as the sum of thinking distance and braking distance.

Key Concept

Total Stopping Distance at 70 mph

Alternative Method

Convert from the standard imperial Highway Code value (

315\text{ feet}

) by using the standard conversion factor or direct component addition in feet (

70\text{ ft} + 245\text{ ft} = 315\text{ ft}

), which equates to

96\text{ metres}

.

Estimated Time:1m 0s

Question 20Question →

In clear weather on a dry road surface, what is the minimum safe time separation gap (in seconds) that should be maintained behind the vehicle in front?

Show answer & explanation

Answer: 2

Answer

2 seconds

Under dry, clear road conditions, the UK Highway Code recommends leaving a minimum time gap of 2 seconds behind the vehicle ahead. This provides sufficient space for the driver to observe hazards, react, and brake safely if the vehicle in front slows or stops suddenly.

Step-by-Step Solution

1

Identify the environmental driving conditions described in the question.

The road is dry and weather conditions are clear.

Road surface conditions determine the appropriate time separation gap multiplier to apply.

2

Apply the standard Highway Code baseline separation rule for dry road surfaces.

The minimum time interval is 2 seconds.

Rule 126 of the UK Highway Code states that drivers should allow at least a two-second gap between their vehicle and the vehicle in front on roads carrying faster-moving traffic in dry conditions.

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The two-second rule establishes the minimum safe following distance between vehicles in normal, dry road conditions to allow adequate thinking and braking margins.

Estimated Time:30s

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