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Safety and Your Vehicle

170 questions

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Question 1Question →

Maintaining tyre safety is essential for roadworthiness and vehicle control under UK driving regulations. Match each tyre condition or scenario to its corresponding safety requirement or legal rule.

Click a left item, then click its matching right item

Items

Checking baseline tyre pressure during regular maintenance
Preparing a car to carry maximum passenger and luggage weight
Driving with a temporary space-saver spare wheel fitted
Assessing tyre tread legality across the central three-quarters of the tread

Matches

Show answer & explanation

Answer

Baseline checks require cold tyre measurement; heavy loads require higher tyre pressure; space-saver wheels require speed restriction to 50 mph; and tread legality requires at least 1.6 mm depth across the central three-quarters and entire outer circumference.
Each scenario directly pairs with its statutory rule or manufacturer maintenance guideline: cold tyre pressure checks avoid inflated thermal readings, heavy loads demand higher tyre pressures, space-saver spares carry a strict 50 mph limit, and legal car tread depth must be at least 1.6 mm across the central three-quarters and around the complete circumference.

Step-by-Step Solution

1
Identify the standard maintenance protocol for tyre pressure checks
Matched regular baseline checks with testing tyres cold
Air expands when warm, so checking cold ensures an accurate reading without false high pressure values.
2
Determine the necessary adjustment when transporting maximum cargo or passengers
Matched maximum vehicle load with inflating tyres to higher manufacturer specifications
Extra weight increases tyre flexing and rolling resistance, requiring higher pressure to maintain structural integrity and handling.
3
Recall the legal and mechanical restrictions on emergency space-saver tyres
Matched space-saver wheel use with the 50 mph maximum speed restriction
Space-saver tyres have smaller contact patches and reduced grip, making them suitable only for temporary low-speed driving.
4
Apply the statutory UK tyre tread requirements for passenger cars
Matched central three-quarters tread assessment with the 1.6 mm minimum depth mandate
The Road Vehicles (Construction and Use) Regulations require 1.6 mm continuous tread depth across the central 75% of the tyre and around its whole circumference.

Key Concept

Tyre safety maintenance standards, load adjustments, emergency wheel limits, and statutory tread depth limits under UK driving law.
Estimated Time:1m 0s
Question 2Question →

How will driving with tyres that are significantly under-inflated affect your vehicle?

Show answer & explanation

Answer: Fuel consumption will increase and braking distance will be extended

Answer

Fuel consumption will increase and braking distance will be extended.
When tyres are under-inflated, the increased flexing of the tyre casing creates higher rolling resistance, which increases vehicle fuel consumption. Additionally, the deformed contact patch reduces effective braking grip and directional stability, leading to longer braking distances and potentially uneven shoulder wear.

Step-by-Step Solution

1
Evaluate the mechanical effect of low tyre pressure on rolling resistance and fuel economy.
Under-inflated tyres flex excessively and generate high rolling resistance, forcing the engine to work harder and consume more fuel.
Maintaining correct pressure minimizes drag and optimizes energy efficiency.
2
Evaluate the effect of low tyre pressure on tyre grip, stability, and stopping distance.
The contact patch becomes uneven with pressure concentrating on the shoulders, reducing optimal grip under heavy braking and lengthening stopping distances.
Correct inflation pressure is essential for even contact distribution and maximum braking performance.

Key Concept

Consequences of tyre under-inflation on vehicle efficiency and safety
Estimated Time:45s
Question 3Question →

While carrying out a routine inspection of your vehicle, you notice excessive tread wear concentrated along only the inside edge of one front tyre, while the rest of the tread pattern is worn evenly and remains well within legal limits. What is the most likely cause of this specific wear pattern?

Show answer & explanation

Answer: Incorrect front wheel alignment (tracking)

Answer

Incorrect front wheel alignment (tracking) is the most likely cause of uneven wear along a single edge of a tyre.
Incorrect wheel alignment (tracking) or suspension defects cause the wheels to run out of true alignment with the vehicle's direction of travel. This drags the tyre sideways as it rolls, creating heavy friction and rapid wear along just one edge.

Step-by-Step Solution

1
Analyze the observed tyre wear pattern from the inspection scenario.
The tyre exhibits isolated wear on one edge (the inner shoulder), while the rest of the tread shows normal, even depth.
Differentiating between symmetrical and asymmetrical wear patterns helps isolate mechanical faults from tyre pressure issues.
2
Identify the vehicle fault associated with single-edge tyre scrubbing.
Steering misalignment or improper tracking causes the wheel to point slightly inward or outward relative to the straight-ahead position, constantly dragging one edge across the road.
Uneven single-edge wear points directly to tracking or suspension misalignment rather than inflation pressure anomalies.

Key Concept

Tyre wear diagnostics and wheel alignment (tracking)
Estimated Time:1m 0s
Question 4Question →

Driving at a sustained speed of 70 mph can increase a vehicle's fuel consumption by up to 30% compared to driving at 50 mph.

Show answer & explanation

Answer: True

Answer

True. Driving at 70 mph uses up to 30% more fuel than driving at 50 mph due to the sharp increase in aerodynamic drag.
The statement is true because air resistance rises rapidly as vehicle speed increases. Overcoming this higher aerodynamic drag requires greater engine power output, causing fuel consumption to increase by up to 30% at 70 mph compared to 50 mph.

Step-by-Step Solution

1
Examine the physical relationship between vehicle road speed and aerodynamic drag.
Aerodynamic resistance increases exponentially as vehicle speed rises, meaning the power required to push the car through the air at 70 mph is considerably higher than at 50 mph.
Air resistance is the primary resistive force acting on a vehicle at motorway speeds.
2
Evaluate the fuel consumption differential established by DVSA eco-safe driving benchmarks.
The extra engine load needed to overcome increased air resistance results in up to a 30% increase in fuel consumption when cruising at 70 mph compared to 50 mph.
Fuel injection rates must increase to maintain engine power output against higher aerodynamic forces.
3
Determine the accuracy of the statement.
The statement matches official DVSA figures and environmental guidelines exactly.
Maintaining moderate, legal cruising speeds directly reduces fuel burn and carbon emissions.

Key Concept

Vehicle Speed, Aerodynamic Resistance, and Fuel Consumption
Estimated Time:45s
Question 5Question →

You are driving a passenger car and towing a braked caravan on a dual carriageway where the national speed limit applies. The road surface is wet following heavy rain. What is your maximum legal speed limit, and how must you adjust your safety margins for the conditions ahead?

Show answer & explanation

Answer: 60 mph; you must increase your normal following distance to at least four seconds to account for the wet conditions.

Answer

60 mph; you must increase your normal following distance to at least four seconds to account for the wet conditions.
The correct answer accurately synthesizes two critical Highway Code rules: vehicles towing a caravan or trailer are restricted to 60 mph on dual carriageways (unlike the 70 mph limit for solitary cars), and the standard two-second separation distance must be doubled to at least four seconds when driving on wet roads to account for significantly increased braking distances.

Step-by-Step Solution

1
Determine the correct speed limit for the vehicle combination on the specified road type.
The limit is 60 mph.
While the national speed limit on a dual carriageway for standalone cars is 70 mph, vehicles towing a caravan or trailer are legally restricted to a maximum of 60 mph.
2
Identify the standard dry-weather following distance.
The standard rule is a two-second time gap.
The Highway Code mandates a minimum two-second gap between your vehicle and the one directly ahead in dry, optimal conditions.
3
Calculate the required safety margin adjustment for the weather conditions.
The gap must be doubled to at least four seconds.
In wet weather, stopping distances are at least double those required on dry roads, so the time gap must be doubled to compensate.

Key Concept

Towing speed limits and wet weather safety margins
Estimated Time:1m 0s
Question 6Question →

Under UK road safety law, it is illegal to fit a rear-facing child car seat in a front passenger seat protected by an active front airbag.

Show answer & explanation

Answer: True

Answer

True: UK law strictly prohibits fitting a rear-facing child car seat in a front seat protected by an active front airbag.
UK law makes it illegal to use a rear-facing child car seat in a front seat fitted with an active airbag because the violent inflation of the airbag can cause severe or fatal head and neck trauma to the child.

Step-by-Step Solution

1
Identify the child restraint configuration and the vehicle safety feature involved.
The statement describes placing a rear-facing child restraint in a passenger seat with an active front airbag.
Airbag deployment dynamics directly impact occupant restraints situated directly in front of them.
2
Apply the relevant UK Highway Code and legal safety requirements.
The law prohibits rear-facing child seats in front of active frontal airbags unless the airbag is deactivated.
The explosive deployment force can strike the back of the child seat and cause catastrophic injuries.

Key Concept

Rear-facing child seat placement and front airbag deactivation rules
Estimated Time:30s
Question 7Question →

A vehicle equipped with a standard factory-fitted electronic engine immobiliser is fully protected against relay attacks when the keyless entry smart fob is stored unprotected inside a nearby house.

Show answer & explanation

Answer: False

Answer

False
The statement is false because relay theft intercepts and magnifies the wireless signal from an unprotected key fob inside a property. When this amplified signal reaches the car, the electronic immobiliser and keyless entry system recognize it as the genuine key, unlocking the doors and allowing the engine to start.

Step-by-Step Solution

1
Analyze how an electronic engine immobiliser verifies authorization
An immobiliser enables the engine to start once it receives the matching cryptographic transponder code from the paired smart key.
Understanding the wireless authentication process is necessary to evaluate potential system bypasses.
2
Examine how relay attack theft functions against keyless systems
Relay devices capture and boost the genuine radio signal between the vehicle and a key fob stored inside a nearby building.
Determines whether an immobiliser receives the valid signal required to permit operation.
3
Assess whether the immobiliser prevents vehicle theft during a relay attack
Because the authentic signal is relayed, the immobiliser recognizes the key as authorized and disarms, allowing the vehicle to be unlocked and driven away.
Concludes that a standard factory immobiliser alone does not protect against relay theft without physical signal-blocking measures.

Key Concept

Keyless entry vulnerability and electronic immobiliser limitations during relay attacks
Estimated Time:1m 0s
Question 8Question →

On which type of road surface can an Anti-lock Braking System (ABS) cause your vehicle's stopping distance to be longer during emergency braking?

Show answer & explanation

Answer: A road surface covered in loose gravel or deep snow

Answer

A road surface covered in loose gravel or deep snow
On loose surfaces such as gravel, loose earth, or snow, an Anti-lock Braking System (ABS) prevents the wheels from locking. While this ensures the driver retains steering control, the rolling wheels ride on top of the loose material instead of locking up and pushing a wedge of loose material in front of them, which can result in an increased stopping distance.

Step-by-Step Solution

1
Analyze how an Anti-lock Braking System (ABS) functions on standard versus loose road surfaces.
ABS prevents road wheels from locking by rapidly pulsing brake pressure, keeping tyres rolling to maintain directional steering control.
Understanding the physical mechanism of wheel rotation versus wheel locking is essential for recognizing surface-specific limitations.
2
Evaluate the effect of loose surface material (gravel, snow) when wheels continue to rotate under ABS control.
Locked wheels naturally dig into loose gravel or snow and build a wedge of material in front of the tyres to help halt the vehicle, whereas ABS keeps the wheels rolling on top of the loose layer.
This rolling action prevents the wedge effect from forming, which can increase the overall stopping distance despite maintaining steering ability.

Key Concept

ABS operation preserves steering control under heavy braking, but on loose surfaces such as gravel or snow, stopping distances may be extended.
Estimated Time:45s
Question 9Question →

Under UK road traffic law, a child aged 3 years or older is legally permitted to travel in the rear seat of a car using an adult seatbelt if a suitable child restraint is unavailable during an unexpected emergency over a short distance.

Show answer & explanation

Answer: True

Answer

True — UK regulations allow a child aged 3 or older to use an adult seatbelt in the rear seat during an unexpected emergency over a short distance if no child seat is available.
The statement is true because UK road traffic regulations and the Highway Code make specific provision for unexpected emergencies over a short distance, allowing children aged 3 years or older to use an adult seatbelt in the rear seat when a child seat is unavailable.

Step-by-Step Solution

1
Identify the standard UK child restraint requirement for children under 135 cm and under 12 years old.
The general rule mandates the use of an approved child car seat suitable for the child's weight and height.
Establishing the baseline legal requirement is necessary before evaluating statutory exceptions.
2
Evaluate the statutory exceptions to child restraint requirements under UK road traffic law.
Exceptions exist for children aged 3 and above: travelling in licensed taxis/private hire vehicles, unexpected short-distance emergencies, and when two fitted child seats prevent fitting a third.
UK legislation (The Motor Vehicles Wearing of Seat Belts Regulations) specifies narrow conditions where an adult belt may be used in the rear.
3
Determine if the scenario satisfies all statutory conditions (child aged 3+, rear seat, unexpected emergency, short distance).
All conditions are met, confirming the legality of the arrangement.
The exemption strictly applies only in the rear seat and never in the front passenger seat or for children under 3 years old.

Key Concept

Child seat legal exemptions under UK road traffic regulations
Estimated Time:45s
Question 10Question →

A driver is descending a long gradient on a single carriageway and observes a red traffic signal 300 metres ahead. To minimise both fuel consumption and exhaust emissions without compromising vehicle control, what is the most effective driving technique?

Show answer & explanation

Answer: Release the accelerator pedal early while remaining in gear to activate the engine's overrun fuel cut-off system

Answer

Release the accelerator pedal early while remaining in gear to activate the engine's overrun fuel cut-off system.
In modern road vehicles equipped with electronic engine management, releasing the accelerator pedal while the vehicle remains in gear triggers the overrun fuel cut-off system. Because the momentum of the moving vehicle drives the engine through the transmission, the fuel injectors deliver zero fuel until engine speed approaches idle RPM. This technique completely eliminates fuel burn during deceleration while maintaining full steering response and engine braking stability.

Step-by-Step Solution

1
Analyse the vehicle drivetrain state during deceleration on a gradient.
Identified that modern electronic fuel injection (EFI) engines incorporate an overrun fuel cut-off mechanism.
When the vehicle is moving in gear with the throttle closed, the turning wheels drive the engine, prompting the engine control unit (ECU) to shut off fuel delivery entirely.
2
Evaluate the energy consumption and control implications of coasting.
Disproved the misconception that shifting to neutral or depressing the clutch saves fuel.
Coasting requires the engine to burn fuel at an idle rate (typically 0.5–1.0 litre/hour) to prevent stalling, whilst simultaneously disconnecting engine braking and compromising steering and braking assistance.
3
Determine the optimal driving technique that balances zero fuel consumption with road safety.
Lifting off the accelerator early while staying in gear achieves zero fuel consumption and controlled deceleration.
This complies directly with DVSA eco-safe driving guidelines by reducing fuel burn to zero, reducing brake wear, and keeping the vehicle under full mechanical control.

Key Concept

Overrun Fuel Cut-off and Engine Braking versus Coasting
Estimated Time:1m 15s
Question 11Question →

Under the UK Highway Code, drivers travelling on a restricted road in a built-up area are prohibited from sounding their vehicle's horn between 23:00 and 07:00 unless another road user poses a danger.

Show answer & explanation

Answer: False

Answer

False
The statement is false because Highway Code Rule 112 establishes the horn restriction on restricted roads in built-up areas from 23:30 (11:30 pm) to 07:00 (7:00 am), not from 23:00.

Step-by-Step Solution

1
Identify the governing Highway Code rule for vehicle horn usage and noise abatement
Highway Code Rule 112 specifies the legal boundaries and nighttime curfew for sounding a vehicle's horn.
Determining the exact legal framework is required to verify statutory time windows and exceptions.
2
Verify the precise restricted hours for horn usage on restricted roads in built-up areas
The prohibited window is 23:30 to 07:00.
Rule 112 strictly defines the start of the built-up area night curfew as 23:30 (11:30 pm), rather than 23:00 (11:00 pm).
3
Compare the statement's specified timeframe with the statutory requirement
The statement asserts that the restriction starts at 23:00, which is legally inaccurate by 30 minutes.
Because the stated curfew start time conflicts with the Highway Code, the statement is false.

Key Concept

Highway Code Rule 112 horn curfew restrictions in built-up areas (23:30 to 07:00)
Estimated Time:45s
Question 12Question →

An Anti-lock Braking System (ABS) guarantees a shorter stopping distance on every type of road surface, including loose gravel and deep snow.

Show answer & explanation

Answer: False

Answer

False
The statement is false. The main function of ABS is to allow the driver to maintain steering control during heavy braking by preventing the wheels from locking. On loose surfaces such as snow, ice, or loose gravel, an ABS-equipped vehicle may actually require a greater stopping distance than a vehicle with locked wheels.

Step-by-Step Solution

1
Identify the primary purpose of an Anti-lock Braking System (ABS).
ABS is designed to prevent wheels from locking during emergency braking, enabling the driver to retain steering control.
Understanding the fundamental objective of ABS distinguishes steering control from stopping distance reduction.
2
Assess how ABS performs on loose road surfaces such as gravel or snow.
On loose surfaces, preventing wheel lock prevents the formation of a wedge of surface material in front of the tyres, which can lengthen the distance required to stop.
This confirms that ABS does not guarantee shorter stopping distances in every condition.

Key Concept

Function and limitations of Anti-lock Braking Systems (ABS) on loose surfaces
Estimated Time:30s
Question 13Question →

Under UK road traffic law, being pregnant provides an automatic exemption from wearing a seatbelt without needing a Certificate of Exemption from Compulsory Seat Belt Wearing issued by a doctor.

Show answer & explanation

Answer: False

Answer

False
The correct answer is False because under UK road traffic regulations (Highway Code Rule 99), pregnancy does not confer an automatic legal exemption from wearing a seatbelt. Expectant mothers are legally required to wear a seatbelt unless a registered doctor issues a formal Certificate of Exemption on medical grounds.

Step-by-Step Solution

1
Identify the relevant legal framework under UK road traffic law and the Highway Code regarding seatbelt exemptions.
Highway Code Rule 99 specifies that all drivers and passengers must wear a seatbelt unless they hold a specific legal exemption.
Establishing the general legal obligation is necessary before evaluating specific exemption claims.
2
Evaluate whether pregnancy is defined as an automatic statutory exemption under UK regulations.
Pregnancy is not an automatic exemption; seatbelts are designed to protect both the mother and unborn child when worn correctly (with the lap belt positioned low across the thighs/hips below the baby bump).
Distinguishing between statutory automatic exemptions (e.g., licensed taxi drivers plying for hire, reversing manoeuvres) and medical conditions clarifies legal requirements.
3
Determine the legal requirement for medical exemptions.
Occupants with medical reasons that prevent wearing a restraint must hold a formal 'Certificate of Exemption from Compulsory Seat Belt Wearing' issued by a doctor.
Verifying the necessity of formal documentation confirms that the statement is false.

Key Concept

Legal rules, medical exemption requirements, and occupant restraint responsibilities under UK road traffic regulations.
Question 14Question →

How should you adjust your vehicle's head restraint to provide the most effective protection in a collision?

Show answer & explanation

Answer: Ensure the rigid part is at least as high as your eyes or the top of your ears, and as close to the back of your head as comfortable.

Answer

Ensure the rigid part of the head restraint is at least as high as your eyes or the top of your ears, and as close to the back of your head as comfortable.
According to the UK Highway Code and vehicle safety guidelines, a correctly adjusted head restraint significantly reduces the risk of whiplash and neck injuries. The rigid part of the restraint must be positioned at least as high as the driver's eyes or the top of the ears, and kept as close to the back of the head as is comfortable.

Step-by-Step Solution

1
Identify the primary safety purpose of an occupant head restraint.
Head restraints are designed to prevent hyperextension of the neck (whiplash) in the event of a collision, particularly from the rear.
Understanding the function clarifies the physical positioning required to support the head.
2
Apply official UK Highway Code guidelines on occupant seating adjustment.
The rigid part of the restraint should be adjusted so it is level with the top of the ears or eye line and positioned close to the back of the head.
This reduces the travel distance of the head before contact, spreading the deceleration forces safely.

Key Concept

Correct adjustment of vehicle head restraints to reduce the severity of whiplash and neck injuries
Estimated Time:30s
Question 15Question →

Keeping the original vehicle registration certificate (V5C) stored inside the vehicle's glove box is recommended so that it is always accessible during journeys.

Show answer & explanation

Answer: False

Answer

False. The vehicle registration certificate (V5C) should never be stored inside the vehicle.
The statement is false because keeping the vehicle registration certificate (V5C) in the car gives a thief proof of the vehicle's details, making it much easier to sell or transfer ownership of the stolen vehicle. To prevent fraud and theft facilitation, the V5C must always be kept in a secure location at home.

Step-by-Step Solution

1
Assess the security implications of leaving original vehicle registration documents inside the vehicle.
Leaving the V5C in the car facilitates identity theft and the illicit resale of the vehicle if it is stolen.
Official vehicle security advice states that ownership documents must be protected and stored securely at home rather than in the car.

Key Concept

Document security and anti-theft prevention regarding the V5C registration certificate
Estimated Time:30s
Question 16Question →

You are driving away from a junction and accelerating onto an open road. How should you manage gear changes to maximise fuel efficiency and minimise environmental impact?

Show answer & explanation

Answer: Change up into a higher gear as soon as possible without labouring the engine

Answer

Change up into a higher gear as soon as possible without labouring the engine
Changing up smoothly into higher gears as early as possible—without causing the engine to struggle or labour—keeps engine speeds low. Operating at lower RPM uses less fuel, reduces mechanical wear, and decreases harmful exhaust emissions.

Step-by-Step Solution

1
Identify the primary mechanical factor governing engine fuel consumption during acceleration
Engine speed (measured in revolutions per minute or RPM) directly affects fuel injection rates and mechanical friction.
Higher engine revolutions burn significantly more fuel and produce greater exhaust emissions for each mile travelled.
2
Apply eco-safe driving techniques for manual and automatic transmissions
Shifting smoothly into higher gears early (typically around 2,000 RPM in diesel vehicles and 2,500 RPM in petrol vehicles) maintains moderate engine speeds without causing the engine to labour.
Keeping engine revolutions within an optimal, lower rev range delivers required road speed with the least amount of fuel.

Key Concept

Eco-safe gear shifting technique and engine efficiency
Estimated Time:45s
Question 17Question →

You are driving a car fitted with anti-lock brakes (ABS) down a steep downhill gradient on a wet asphalt road when an unexpected hazard suddenly blocks your lane. How should you apply the footbrake to execute an emergency stop while maintaining vehicle control?

Show answer & explanation

Answer: Apply the footbrake firmly and hold it down continuously without releasing pressure until the vehicle has stopped.

Answer

Apply the footbrake firmly and hold it down continuously without releasing pressure until the vehicle has stopped.
When performing an emergency stop in a vehicle equipped with ABS, the driver should apply immediate, firm, and continuous pressure to the footbrake pedal without releasing it. The ABS system automatically monitors wheel speed and rapidly pulses hydraulic brake pressure to each wheel just below the locking threshold. This ensures the maximum available tyre grip is used for deceleration while keeping the wheels rotating sufficiently to preserve steering control.

Step-by-Step Solution

1
Identify the vehicle's braking capability and emergency requirements.
The vehicle is equipped with an anti-lock braking system (ABS) and requires maximum deceleration on a low-friction downhill surface.
ABS is engineered to prevent wheels from locking under heavy braking, ensuring the driver maintains steering control.
2
Select the correct driver input for ABS operation.
Depress the brake pedal hard and keep full, steady pressure applied.
Cadence braking (pumping the pedal) is obsolete in ABS-equipped vehicles; manual pumping interferes with the electronic modulation of line pressure.
3
Maintain directional control while stopping.
Steer around hazards if necessary while ABS continues to operate.
Because the tyres do not remain locked, rotational friction is maintained, allowing directional steering input to remain effective.

Key Concept

Correct emergency braking technique with an anti-lock braking system (ABS)
Estimated Time:1m 30s
Question 18Question →

When performing a daily tyre inspection on a standard passenger car, the UK legal minimum requirement dictates that the tread depth must be at least 1.6 mm across the entire edge-to-edge width of the tyre, maintaining this depth continuously around the complete circumference.

Show answer & explanation

Answer: False

Answer

The statement is False.
The statement is false because the UK Highway Code and vehicle safety regulations mandate a minimum tread depth of 1.6 mm across the central three-quarters of the breadth of the tyre, rather than the entire edge-to-edge width. While the requirement for it to be continuous around the circumference is correct, the width condition renders the claim incorrect.

Step-by-Step Solution

1
Identify the core legal tread depth requirement for car tyres in the UK.
The minimum legal tread depth is mandated at 1.6 mm.
This is the fundamental statutory limit required to ensure adequate grip and water clearance.
2
Determine the required distribution of this tread depth across the tyre's circumference.
The depth must be maintained in a continuous band around the entire circumference of the tyre.
Tyre wear must not dip below the minimum limit at any point around the rotation of the wheel.
3
Identify the statutory requirement regarding the distribution across the width (breadth) of the tyre.
The law applies specifically to the central three-quarters of the breadth of the tread.
The extreme edges of the tyre are not legally required to meet the 1.6 mm limit, acknowledging that vehicle geometry and cornering naturally cause varying wear patterns at the outer margins.
4
Evaluate the provided statement against these exact legal parameters.
The statement incorrectly claims the 1.6 mm limit must apply across the 'entire edge-to-edge width'.
Because the width specification in the statement explicitly contradicts the precise legal definition (central three-quarters), the entire statement is rendered false.

Key Concept

Statutory Tyre Tread Depth Dimensions
Question 19Question →

Match each tyre condition or scenario to its corresponding legal implication, consequence, or required action according to UK road safety regulations.

Click a left item, then click its matching right item

Items

Tread depth measures 1.4mm on the outer edge, but maintains 1.8mm across the central three-quarters of the tread breadth around the entire circumference.
A deep sidewall cut exposes the internal cord fabric, although the tyre completely maintains its recommended cold pressure for maximum load.
A space-saver spare wheel is fitted to the driven axle to replace a punctured tyre while travelling on a high-speed dual carriageway.
Continuous and severe steering wheel vibration is experienced primarily when driving at high cruising speeds.

Matches

Show answer & explanation

Answer

The correct pairings match the 1.4mm outer edge tread to remaining legally permissible, the cut exposing cord to being legally defective, the space-saver spare to a 50 mph restriction, and the steering vibration to unbalanced wheels.
Each match correctly applies UK road traffic law and mechanical principles: 1.6mm tread is only required in the central three-quarters; exposed cords make a tyre illegal regardless of pressure; space-savers have a strict 50 mph limit; and steering vibration indicates wheel imbalance.

Step-by-Step Solution

1
Evaluate the tread depth scenario against the UK statutory requirement.
The requirement is 1.6mm across the central three-quarters of the breadth. Since the central portion is 1.8mm, the 1.4mm outer edge does not make the tyre illegal.
To verify if uneven wear compromises the specific legal threshold.
2
Assess the structural damage scenario (cut exposing cords) against legal definitions of a defective tyre.
Exposed cords automatically render a tyre legally defective and unsafe for road use, overriding any ability to maintain correct pressure.
To distinguish between cosmetic surface damage and structural failure.
3
Determine the legal limitations of driving with a space-saver spare wheel.
Space-saver wheels must never be driven above 50 mph (80 km/h) and are strictly for temporary emergency use.
To apply manufacturer and legal constraints regarding temporary tyre usage on high-speed roads.
4
Identify the mechanical cause and consequence of high-speed steering vibration.
Steering wheel vibration specifically points to unbalanced front wheels, which accelerates component wear.
To link a common physical driving symptom to its underlying tyre maintenance issue.

Key Concept

Statutory requirements for tyre condition, tread depth limits, and temporary wheel restrictions.
Question 20Question →

A car owner is looking for practical ways to cut fuel costs and reduce exhaust emissions during daily driving. Which measure will reliably improve their vehicle's fuel efficiency?

Show answer & explanation

Answer: Dismounting an unused roof rack and removing non-essential heavy items from the vehicle

Answer

Dismounting an unused roof rack and removing non-essential heavy items from the vehicle
Removing external accessories such as roof racks or roof boxes when they are not in use significantly reduces aerodynamic drag. In addition, taking unnecessary heavy objects out of the boot reduces overall vehicle mass. Together, these measures reduce the engine's required power output, improving miles per gallon (MPG) and cutting exhaust emissions.

Step-by-Step Solution

1
Evaluate the impact of vehicle weight and aerodynamic drag on engine energy demand.
Excess weight requires more chemical energy to accelerate, and external attachments such as roof racks increase aerodynamic resistance (drag).
Overcoming unnecessary aerodynamic drag and rolling mass forces the engine to burn additional fuel.
2
Assess candidate driving and maintenance actions against eco-safe driving principles.
Removing the roof rack restores streamlined airflow, and clearing heavy items reduces payload mass.
Both adjustments directly minimise engine workload without compromising vehicle safety or control.

Key Concept

Minimising aerodynamic resistance and vehicle payload optimizes fuel economy and reduces emissions.
Estimated Time:1m 0s
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