Safety Margins Alıştırma Soruları — UK Driving Theory Test — Sayfa 4

Soru 61Soru →

You are driving at $30\text{ mph}$ ( $48\text{ km/h}$ ) on a road covered in smooth ice. According to The Official Highway Code, the typical overall stopping distance on a dry road at this speed is $23\text{ metres}$ ( $75\text{ feet}$ ). What is the maximum total stopping distance you should allow for in these icy conditions?

46\text{ metres}

(

150\text{ feet}

)

92\text{ metres}

(

300\text{ feet}

)

230\text{ metres}

(

750\text{ feet}

)

115\text{ metres}

(

375\text{ feet}

)

Cevabı ve açıklamayı göster

Cevap: $230\text{ metres}$ ( $750\text{ feet}$ )

Cevap

230\text{ metres}

(

750\text{ feet}

)

According to The Official Highway Code, stopping distances on icy roads can increase by up to ten times compared to dry conditions. For a vehicle travelling at

30\text{ mph}

where the baseline dry stopping distance is

23\text{ metres}

(

75\text{ feet}

), multiplying by

10

yields a maximum distance of

230\text{ metres}

(

750\text{ feet}

).

Adım Adım Çözüm

1

Identify the base stopping distance for the given speed under normal conditions

At

30\text{ mph}

(

48\text{ km/h}

), the standard stopping distance on a dry road is

23\text{ metres}

(

75\text{ feet}

).

The baseline stopping distance consists of

9\text{ metres}

thinking distance plus

14\text{ metres}

braking distance.

2

Apply the official environmental multiplier for ice and snow according to The Highway Code

Icy conditions increase stopping distances by up to

10

times (

10\times

).

Severe loss of tyre friction drastically lengthens braking distance.

3

Calculate the total required stopping distance on ice

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

(

75\text{ feet} \times 10 = 750\text{ feet}

).

Multiplying the base distance by

10

provides the maximum expected stopping distance.

Anahtar Kavram

Highway Code stopping distances under adverse weather conditions (tenfold increase on ice)

Tahmini Süre:1m 0s

Soru 62Soru →

Which factor will directly increase a driver's thinking distance when responding to an emergency on the road?

Driving on a road surface covered with standing water

Driving a car that has poorly maintained brakes

Driving after consuming alcohol or taking drowsy medication

Driving with under-inflated tyres

Cevabı ve açıklamayı göster

Cevap: Driving after consuming alcohol or taking drowsy medication

Cevap

Driving after consuming alcohol or taking drowsy medication

Thinking distance is the distance a vehicle travels while the driver perceives a hazard and reacts to press the brake pedal. Anything that slows the driver's mental processing and physical reflexes—such as alcohol consumption, fatigue, or drowsiness caused by medication—directly increases thinking distance.

Adım Adım Çözüm

1

Define thinking distance in the context of stopping distance.

Thinking distance is the distance travelled by the vehicle from the moment a hazard is perceived until the driver actually applies the brakes.

Understanding the definition establishes that thinking distance depends entirely on vehicle speed and driver reaction time.

2

Differentiate driver-related factors from vehicle and environmental factors.

Driver condition (such as fatigue, alcohol, or medication) lengthens reaction time and increases thinking distance, whereas mechanical and environmental conditions (brakes, tyres, wet roads) affect braking distance.

This allows accurate elimination of distractors related solely to vehicle braking efficiency.

Anahtar Kavram

Thinking distance is the distance travelled during driver reaction time and is increased by driver impairment such as alcohol, tiredness, distraction, or sedating medication.

Soru 63Soru →

A vehicle's total stopping distance is comprised of thinking distance and braking distance. Match each driver condition or situational factor to its direct mechanism affecting thinking distance.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

Doubling travelling speed matches doubling distance covered at constant reaction time; severe fatigue matches slowed neuromuscular reflexes; engaging in hands-free phone use matches cognitive distraction and delayed hazard identification; taking drowsy antihistamines matches pharmacological sedation and prolonged neural processing.

Thinking distance depends strictly on vehicle speed and driver reaction time. Doubling speed doubles distance covered during reaction time. Hands-free phone use introduces cognitive distraction that delays hazard perception. Fatigue degrades neuromuscular reflex speed. Drowsy medications pharmacologically prolong central nervous system processing time.

Adım Adım Çözüm

1

Analyze the physical relationship between speed and thinking distance.

Thinking distance is mathematically proportional to speed (

d = v \times t

). When speed doubles and reaction time remains fixed, the thinking distance doubles.

Speed is a physical multiplier of thinking distance independent of biological reaction time.

2

Distinguish cognitive distraction from physiological and pharmacological impairment.

Hands-free phone usage causes cognitive workload diversion (delayed hazard detection), fatigue causes physical exhaustion and slowed reflex response, and sedative medication produces pharmacological depression of the nervous system.

Each factor impairs a distinct component of the perception-reaction sequence.

3

Match each factor to its corresponding operational mechanism.

All four pairs are matched to their distinct physiological or physical effects.

Ensures precise conceptual alignment without confusing thinking distance factors with braking distance factors.

Anahtar Kavram

Thinking distance is the distance travelled while reacting to a hazard (

d = v \times t

) and is solely determined by vehicle speed and driver reaction time (perception, cognitive processing, and physical reflex speed).

Tahmini Süre:1m 30s

Soru 64Soru →

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?

Cevabı ve açıklamayı göster

Cevap: 53

Cevap

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}

).

Adım Adım Çözüm

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.

Anahtar Kavram

Highway Code stopping distance breakdown at

50\text{ mph}

on dry roads

Tahmini Süre:45s

Soru 65Soru →

A driver's thinking distance is the distance covered from the moment a hazard is first spotted until the brakes are applied. Match each factor to the specific way it increases thinking distance.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

The correct matching connects higher speed to covering more metres per second, phone distraction to diverted attention, tiredness to slowed sensory reflexes, and drowsy medication to pharmaceutical nervous system impairment.

Thinking distance depends purely on the driver's reaction time and vehicle speed. Speed increases metres travelled per second; distractions delay hazard spotting; fatigue slows cognitive processing; and sedating medication depresses physical and mental reflexes.

Adım Adım Çözüm

1

Identify how vehicle speed affects thinking distance.

Speed determines distance covered per unit of reaction time.

At 60 mph compared to 30 mph, the vehicle travels twice as far in the same reaction interval.

2

Examine driver cognitive distractions such as hands-free phone conversations.

Distraction diverts mental attention and delays hazard recognition.

The driver takes longer to mentally register that a hazard is developing.

3

Assess the physical effect of fatigue.

Tiredness impairs alertness and slows neurological response.

A fatigued brain requires more time to process visual stimuli and command physical action.

4

Evaluate medicinal side-effects.

Sedating medication depresses central nervous system reflexes.

Drowsiness directly lengthens the physical time taken to move a foot to the brake pedal.

Anahtar Kavram

Thinking distance is directly influenced by driver reaction time (affected by tiredness, distraction, and drugs/medication) and travelling speed (which increases distance covered during that reaction time).

Tahmini Süre:45s

Soru 66Soru →

After completing an overnight work shift, a motorist is travelling along a clear bypass when an unexpected hazard appears. Which factor will prolong the distance the vehicle travels before the driver physically presses the brake pedal?

Severely worn brake pads reducing mechanical braking efficiency

Standing surface water on the road reducing tyre grip

Driver tiredness and reduced cognitive reaction speed

Increased vehicle weight from carrying multiple adult passengers

Cevabı ve açıklamayı göster

Cevap: Driver tiredness and reduced cognitive reaction speed

Cevap

Driver tiredness and reduced cognitive reaction speed

Thinking distance is the distance a vehicle travels during the driver's reaction time—from the instant a hazard is perceived until the driver actually applies the footbrake. Driver tiredness significantly slows neural reaction speed, meaning the vehicle covers more ground before braking begins.

Adım Adım Çözüm

1

Identify the specific phase of stopping distance described in the question stem

The phrase 'distance the vehicle travels before the driver physically presses the brake pedal' defines the thinking distance (reaction distance).

Total stopping distance is split into thinking distance (hazard detection to brake press) and braking distance (brake press to full stop).

2

Analyze which variables affect thinking distance versus braking distance

Thinking distance depends strictly on vehicle speed and driver reaction time (governed by fatigue, drugs, alcohol, illness, or distraction), whereas braking distance depends on tyres, brakes, road surface, and vehicle weight.

Mechanical components and road adhesion only operate once the braking system has been physically engaged.

3

Evaluate the provided options against the identified thinking distance mechanism

Driver fatigue directly impairs alertness and doubles or triples mental processing time, directly extending thinking distance.

Brake wear, standing water, and passenger weight are physical/mechanical factors that only influence braking distance.

Anahtar Kavram

Thinking distance is the distance travelled while reacting to a hazard before applying the brakes, and it is strictly determined by vehicle speed and driver reaction time.

Tahmini Süre:1m 0s

Soru 67Soru →

While driving on a well-maintained, dry road at a steady speed of $50\text{ mph}$ ( $80\text{ km/h}$ ), you suddenly need to bring your car to a complete stop in an emergency. According to The Official Highway Code, what is the standard braking distance under these conditions?

15\text{ metres}

(

50\text{ feet}

)

53\text{ metres}

(

175\text{ feet}

)

38\text{ metres}

(

125\text{ feet}

)

76\text{ metres}

(

250\text{ feet}

)

Cevabı ve açıklamayı göster

Cevap: $38\text{ metres}$ ( $125\text{ feet}$ )

Cevap

38\text{ metres}

(

125\text{ feet}

)

According to The Official Highway Code, a car travelling at

50\text{ mph}

(

80\text{ km/h}

) has a total stopping distance of

53\text{ metres}

(

175\text{ feet}

). This total consists of a thinking distance of

15\text{ metres}

(

50\text{ feet}

) plus a braking distance of

38\text{ metres}

(

125\text{ feet}

). Therefore, the braking distance alone is

38\text{ metres}

(

125\text{ feet}

).

Adım Adım Çözüm

1

Recall the components of total stopping distance at

50\text{ mph}

(

80\text{ km/h}

).

Total Stopping Distance = Thinking Distance + Braking Distance

Overall stopping distance is always divided into the driver's reaction phase and the vehicle's deceleration phase.

2

Identify the specific values specified by The Official Highway Code for

50\text{ mph}

on dry asphalt.

Thinking distance is

15\text{ metres}

(

50\text{ feet}

) and total stopping distance is

53\text{ metres}

(

175\text{ feet}

).

Official standards establish fixed reference values under ideal dry conditions.

3

Calculate or isolate the braking distance component.

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

(

125\text{ feet}

)

Subtracting thinking distance from overall stopping distance gives the exact distance required for the brakes to bring the vehicle to a halt.

Anahtar Kavram

Decomposition of stopping distance into thinking and braking components at 50 mph

Tahmini Süre:45s

Soru 68Soru →

You are initially travelling at $70\text{ mph}$ ( $112\text{ km/h}$ ) on a dry motorway. Later in your journey, you drive at $30\text{ mph}$ ( $48\text{ km/h}$ ) on an icy residential road where braking distances are ten times longer than normal. According to the official Highway Code, what is the exact difference in your overall stopping distance between these two specific scenarios?

It is

53\text{ metres}

greater in the

30\text{ mph}

icy condition.

It is

134\text{ metres}

greater in the

30\text{ mph}

icy condition.

It is

73\text{ metres}

greater in the

70\text{ mph}

dry condition.

It is

65\text{ metres}

greater in the

30\text{ mph}

icy condition.

Cevabı ve açıklamayı göster

Cevap: It is $53\text{ metres}$ greater in the $30\text{ mph}$ icy condition.

Cevap

The overall stopping distance is 53 metres greater in the 30 mph icy condition.

At 70 mph, the total stopping distance is 96 metres. At 30 mph on ice, the standard 14m braking distance increases tenfold to 140m, while the 9m thinking distance stays the same, creating a total stopping distance of 149m. Subtracting the dry distance (96m) from the icy distance (149m) results in a difference of 53 metres.

Adım Adım Çözüm

1

Calculate the total stopping distance at 70 mph on a dry road.

Thinking distance = 21 metres, Braking distance = 75 metres. Total = 96 metres.

To establish the baseline stopping distance for the first scenario using standard Highway Code figures.

2

Calculate the total stopping distance at 30 mph on an icy road.

Thinking distance = 9 metres. Braking distance (14 metres) x 10 = 140 metres. Total = 149 metres.

Ice increases braking distance by a factor of ten, but human reaction time (thinking distance) remains unaffected by the road surface.

3

Determine the difference between the two total stopping distances.

149 metres (icy) - 96 metres (dry) = 53 metres.

To answer the specific question asked in the stem regarding the exact difference.

Anahtar Kavram

Calculating and comparing total stopping distances across different speeds and severe weather conditions by separating thinking and braking components.

Soru 69Soru →

You are driving on a rural road behind another car during steady rain. What is the minimum time gap you should maintain between your vehicle and the car ahead?

At least one second

At least two seconds

At least four seconds

At least ten seconds

Cevabı ve açıklamayı göster

Cevap: At least four seconds

Cevap

At least four seconds

In good, dry conditions, drivers should leave a minimum gap of two seconds from the vehicle in front. In wet weather, tyre adhesion is significantly reduced and stopping distance increases, so the Highway Code requires drivers to double this margin to at least four seconds.

Adım Adım Çözüm

1

Identify the standard separation distance rule for dry roads

In normal, dry conditions, the safe following margin is at least two seconds.

The two-second rule provides sufficient thinking and braking distance under good tyre-to-road adhesion.

2

Apply the wet weather adjustment rule from the Highway Code

Double the standard time gap, resulting in at least four seconds.

Water lowers surface friction and increases braking distance, requiring double the separation buffer.

Anahtar Kavram

Separation margins must be doubled from two to at least four seconds on wet roads.

Tahmini Süre:30s

Soru 70Soru →

Safe driving requires a clear understanding of how thinking and braking distances combine under dry road conditions. Match each vehicle speed and distance component to its official value as stated in The Highway Code.

Soldaki öğeye tıklayın, sonra eşleşen sağdaki öğeye tıklayın

Cevabı ve açıklamayı göster

Cevap

20\text{ mph}

Total stopping distance matches

12\text{ metres}

(

40\text{ feet}

);

40\text{ mph}

Braking distance matches

24\text{ metres}

(

80\text{ feet}

);

60\text{ mph}

Total stopping distance matches

73\text{ metres}

(

240\text{ feet}

);

70\text{ mph}

Thinking distance matches

21\text{ metres}

(

70\text{ feet}

).

According to The Highway Code, stopping distances on dry surfaces consist of thinking distance plus braking distance. At

20\text{ mph}

, the overall stopping distance is

12\text{ m}

(

40\text{ ft}

). At

40\text{ mph}

, the braking component alone is

24\text{ m}

(

80\text{ ft}

). At

60\text{ mph}

, the total stopping distance reaches

73\text{ m}

(

240\text{ ft}

). At

70\text{ mph}

, the thinking distance component is

21\text{ m}

(

70\text{ ft}

).

Adım Adım Çözüm

1

Determine the total stopping distance for a vehicle travelling at

20\text{ mph}

12\text{ metres}

(

40\text{ feet}

)

At

20\text{ mph}

, thinking distance is

6\text{ metres}

(

20\text{ feet}

) and braking distance is

6\text{ metres}

(

20\text{ feet}

), summing to

12\text{ metres}

(

40\text{ feet}

).

2

Isolate the braking distance component for a vehicle travelling at

40\text{ mph}

24\text{ metres}

(

80\text{ feet}

)

At

40\text{ mph}

, thinking distance is

12\text{ metres}

while the vehicle travels

24\text{ metres}

under braking before coming to a halt.

3

Calculate the total stopping distance for a vehicle travelling at

60\text{ mph}

73\text{ metres}

(

240\text{ feet}

)

At

60\text{ mph}

, thinking distance is

18\text{ metres}

(

60\text{ feet}

) and braking distance is

55\text{ metres}

(

180\text{ feet}

), giving a combined total of

73\text{ metres}

(

240\text{ feet}

).

4

Identify the reaction/thinking distance component for a vehicle travelling at

70\text{ mph}

21\text{ metres}

(

70\text{ feet}

)

Thinking distance increases linearly with speed; at

70\text{ mph}

, reaction distance equals

21\text{ metres}

(

70\text{ feet}

).

Anahtar Kavram

Total Stopping Distance equals Thinking Distance plus Braking Distance under standard dry road conditions.

Tahmini Süre:1m 15s

Soru 71Soru →

While travelling at 50 mph on a wet road, you need to bring your vehicle to a complete stop. Which of the following will directly increase your vehicle's braking distance?

Driver tiredness causing delayed reaction times

Worn tyres with insufficient tread depth

Failing to double the following distance behind the vehicle ahead

Harshly pumping the footbrake during an unexpected skid

Cevabı ve açıklamayı göster

Cevap: Worn tyres with insufficient tread depth

Cevap

Worn tyres with insufficient tread depth

Worn tyres with low tread depth have a compromised ability to displace surface water, leading to reduced friction between the tyre rubber and the road surface. This physical loss of grip directly extends the distance the vehicle travels while the brakes are being applied.

Adım Adım Çözüm

1

Identify the components of total stopping distance

Total Stopping Distance = Thinking Distance + Braking Distance

Thinking distance depends on driver perception and reaction, whereas braking distance depends on vehicle condition, speed, and road grip.

2

Differentiate driver-related factors from vehicle and road friction factors

Driver fatigue and separation distance errors relate to perception/buffer, whereas tyre tread depth directly governs tyre-to-road friction.

Worn tyre tread reduces water dispersal, diminishing frictional grip and extending the physical distance required to bring the vehicle to a halt.

Anahtar Kavram

Braking distance is determined by the physical friction between tyres and the road, vehicle braking efficiency, road surface conditions, and vehicle weight, distinct from thinking distance.

Tahmini Süre:45s

Soru 72Soru →

When driving on icy or snowy roads, your overall stopping distance can increase by up to ten times compared to dry road conditions.

Doğru

Yanlış

Cevabı ve açıklamayı göster

Cevap: True

Cevap

True

The statement is true because The Highway Code specifies that overall stopping distances can be up to ten times greater on ice and snow than on dry roads, requiring significantly larger separation gaps and gentler vehicle inputs.

Adım Adım Çözüm

1

Identify the specific road surface condition described in the statement.

The statement refers to driving on ice or snow.

Different adverse weather conditions require different safety margin adjustments.

2

Recall the official Highway Code guidance regarding stopping distances on ice and snow.

Stopping distances can increase by up to 10 times normal dry road distances.

Severely reduced tyre grip on ice significantly reduces braking efficiency.

3

Determine if the statement matches the Highway Code rule.

The statement correctly states the tenfold increase.

The factual claim is accurate.

Anahtar Kavram

Stopping distance multiplier in icy and snowy conditions

Tahmini Süre:30s

Soru 73Soru →

How will driving down a steep hill affect your vehicle's braking distance?

It will only increase the thinking distance

It will increase the braking distance

It will decrease the braking distance

It will have no effect on the braking distance

Cevabı ve açıklamayı göster

Cevap: It will increase the braking distance

Cevap

It will increase the braking distance

When driving down a steep hill, gravity accelerates the vehicle and increases its forward momentum. The brakes must dissipate significantly more energy to overcome this gravitational pull, directly increasing the vehicle's braking distance.

Adım Adım Çözüm

1

Identify the physical forces acting on a vehicle travelling downhill.

Gravity pulls the vehicle downward along the slope, adding to the vehicle's forward momentum.

Evaluating forces acting on the vehicle is required to determine how stopping capability changes.

2

Assess how downhill momentum influences the braking mechanism.

The brakes must work harder to overcome gravitational acceleration, lengthening the distance travelled while braking.

Braking distance is the physical distance covered between applying the brakes and coming to a complete standstill.

Anahtar Kavram

Physical factors affecting vehicle braking distance on road gradients

Tahmini Süre:35s

Soru 74Soru →

You are driving on a road covered with packed snow and ice. In normal dry conditions, you should leave a two-second time gap from the vehicle ahead. How much of a time gap should you leave in these icy conditions?

4 seconds

20 seconds

2 seconds

8 seconds

Cevabı ve açıklamayı göster

Cevap: 20 seconds

Cevap

20 seconds

In icy or snowy conditions, tyre grip is drastically reduced and stopping distances can increase by up to ten times compared to dry road conditions. To maintain a safe safety margin, the normal two-second following distance must be increased up to twenty seconds.

Adım Adım Çözüm

1

Identify the standard baseline following distance for dry road conditions.

The baseline separation gap is 2 seconds.

This provides adequate reaction and stopping time under normal dry conditions.

2

Apply the stopping distance multiplier for icy or snowy surfaces.

The stopping distance increases by up to 10 times, so the time gap becomes

2 \times 10 = 20

seconds.

Severe loss of tyre grip on ice requires ten times the normal separation margin.

Anahtar Kavram

Following distance time multiplier on ice and snow

Tahmini Süre:30s

Soru 75Soru →

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?

Cevabı ve açıklamayı göster

Cevap: 12

Cevap

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}

).

Adım Adım Çözüm

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.

Anahtar Kavram

Total Stopping Distance = Thinking Distance + Braking Distance

Tahmini Süre:1m 0s

Soru 76Soru →

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?

Cevabı ve açıklamayı göster

Cevap: 46

Cevap

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}

.

Adım Adım Çözüm

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.

Anahtar Kavram

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

Tahmini Süre:1m 0s

Soru 77Soru →

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?

Cevabı ve açıklamayı göster

Cevap: 150

Cevap

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.

Adım Adım Çözüm

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.

Anahtar Kavram

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.

Tahmini Süre:1m 30s

Soru 78Soru →

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?

Cevabı ve açıklamayı göster

Cevap: 230

Cevap

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}

).

Adım Adım Çözüm

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.

Anahtar Kavram

Highway Code stopping distance adjustment on ice and snow

Tahmini Süre:45s

Soru 79Soru →

You are driving on a dual carriageway in wet conditions, keeping an appropriate safety margin behind the vehicle ahead. Another car overtakes you and pulls directly into your safety gap. What is the safest action you should take to adjust your safety margin?

Brake firmly to instantly recreate the required four-second distance

Ease off the accelerator gradually until at least a four-second gap is restored

Maintain your current speed and flash your headlights until the vehicle pulls further ahead

Drop back only enough to keep the standard two-second dry-weather gap

Cevabı ve açıklamayı göster

Cevap: Ease off the accelerator gradually until at least a four-second gap is restored

Cevap

Ease off the accelerator gradually until at least a four-second gap is restored.

When another vehicle enters your following space in wet weather, you must re-establish an adequate safety cushion. Because wet conditions double overall stopping distances, the Highway Code requires at least double the normal dry-weather gap (at least four seconds). Easing off the accelerator gradually is the safest method to restore this buffer without destabilising the vehicle or causing a skid through sudden braking.

Adım Adım Çözüm

1

Assess the change in separation distance under wet road conditions.

Recognise that the overtaking vehicle has compromised your safety buffer below the wet-weather threshold.

Because tyre grip is substantially reduced on wet surfaces, stopping distances double, necessitating a minimum following gap of four seconds instead of the normal two seconds.

2

Select the correct vehicle control technique to restore the margin.

Gently ease off the accelerator pedal rather than applying sharp braking.

Abrupt braking on slippery road surfaces can easily destabilise the vehicle, induce skidding, or startle drivers following closely behind.

3

Re-establish and verify the safe following time interval.

Allow the vehicle ahead to move forward until there is at least a four-second time gap between vehicles.

Maintaining at least four seconds provides adequate time and space to react and stop safely if the lead vehicle brakes unexpectedly.

Anahtar Kavram

In wet weather, braking distances double, requiring drivers to double the normal two-second separation gap to at least four seconds and to restore this buffer smoothly by easing off the accelerator.

Tahmini Süre:1m 0s

Soru 80Soru →

You are driving an ordinary passenger car at $30\text{ mph}$ ( $48\text{ km/h}$ ) along a dry, level road in good weather conditions. In an emergency stop, what is the typical braking distance required for your vehicle to come to a complete standstill?

9\text{ metres}

(

30\text{ feet}

)

14\text{ metres}

(

45\text{ feet}

)

23\text{ metres}

(

75\text{ feet}

)

28\text{ metres}

(

90\text{ feet}

)

Cevabı ve açıklamayı göster

Cevap: $14\text{ metres}$ ( $45\text{ feet}$ )

Cevap

The typical braking distance at

30\text{ mph}

under dry conditions is

14\text{ metres}

(

45\text{ feet}

).

Under normal dry conditions, a vehicle travelling at

30\text{ mph}

(

48\text{ km/h}

) has a thinking distance of

9\text{ metres}

(

30\text{ feet}

) and a braking distance of

14\text{ metres}

(

45\text{ feet}

), giving a total stopping distance of

23\text{ metres}

(

75\text{ feet}

). Therefore, the braking distance component alone is

14\text{ metres}

(

45\text{ feet}

).

Adım Adım Çözüm

1

Identify the total stopping distance breakdown from The Highway Code for a car travelling at

30\text{ mph}

(

48\text{ km/h}

).

Total stopping distance is

23\text{ metres}

(

75\text{ feet}

), comprising thinking distance and braking distance.

Stopping distance consists of two separate components: thinking distance and braking distance.

2

Determine the thinking distance component at

30\text{ mph}

.

Thinking distance is

9\text{ metres}

(

30\text{ feet}

).

At

30\text{ mph}

, reaction time typically accounts for

9\text{ metres}

before the brakes are applied.

3

Subtract the thinking distance from the total stopping distance to isolate the braking distance.

23\text{ metres} - 9\text{ metres} = 14\text{ metres}

(

75\text{ feet} - 30\text{ feet} = 45\text{ feet}

).

Braking distance is the physical distance the car travels after the brake pedal is pressed until coming to a complete stop.

Anahtar Kavram

Highway Code stopping distance components at 30 mph

Tahmini Süre:1m 0s

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