Below is a free Safety & Your Vehicle mock test for the UK DVSA car theory test: multiple-choice questions in the official four-option format, each with the correct answer, a plain-English explanation and a Highway Code reference. Vehicle condition, fault warning signs, security and environmental basics.
Safety & Your Vehicle practice questions
Q1. What is the legal minimum tread depth for car tyres?
- 1.0 mm across the whole tyre
- 1.6 mm across the central three-quarters of the breadth, around the entire circumference
- 2.5 mm on the outer edges only
- 3.0 mm in winter months
Answer: B. Car tyres must have at least 1.6 mm of tread across the central three-quarters of the tyre, all the way round. Worn tyres dramatically increase stopping distances, especially in the wet. Reference: The Highway Code — Annexe 6: Vehicle maintenance
Q2. When should you check your tyre pressures for an accurate reading?
- Immediately after a motorway journey
- When the tyres are cold, using the pressures in the vehicle handbook
- Only at an MOT test
- After driving at least ten miles
Answer: B. Driving warms the air in the tyres and raises the reading. Check pressures when cold, against the handbook figures — and remember to adjust for heavy loads or motorway trips where the handbook says so. Reference: The Highway Code — Annexe 6: Vehicle maintenance
Q3. What is the main benefit of anti-lock brakes (ABS) in an emergency stop?
- They shorten stopping distance on ice
- They stop the wheels locking, so you can continue to steer while braking hard
- They apply the handbrake automatically
- They make skids impossible in all conditions
Answer: B. ABS prevents the wheels locking under hard braking, which keeps the steering responsive so you can avoid the hazard while stopping. It doesn't guarantee shorter stops, particularly on loose or icy surfaces. Reference: The Highway Code — rule 120
Q4. Your steering suddenly feels heavy. What's the most likely cause?
- Worn brake pads
- A tyre with too little air in it
- A full fuel tank
- Cold engine oil
Answer: B. Heavy steering commonly points to an underinflated or punctured tyre. Stop somewhere safe and check — driving on a badly deflated tyre wrecks the tyre and can cause loss of control. Reference: The Highway Code — Annexe 6: Vehicle maintenance
Q5. The brake system warning light stays on after you start the car. What should you do?
- Drive normally — warning lights often reset themselves
- Check the handbrake is fully released, and if the light stays on have the brakes checked before driving on
- Pump the brake pedal until the light goes out
- Ignore it if the brakes feel normal
Answer: B. A brake warning light can mean low fluid or a system fault. Brakes are not a 'monitor it' item: if the light stays on, get the system checked immediately rather than driving on. Reference: The Highway Code — Annexe 6: Vehicle maintenance
Q6. What does a catalytic converter do?
- Improves fuel economy
- Reduces the toxic gases in the exhaust
- Quietens the exhaust note
- Increases engine power
Answer: B. The catalytic converter chemically converts the most harmful exhaust gases into less damaging ones. It doesn't reduce carbon dioxide — driving less and driving smoothly do that. Reference: The Highway Code — Annexe 6 and rule 123
Q7. Your steering wheel vibrates at certain speeds. What's the likely cause?
- The wheels need balancing
- Low engine oil
- Worn brake pads
- A faulty alternator
Answer: A. A speed-related vibration through the steering usually means unbalanced front wheels. Have them balanced promptly — the vibration accelerates wear in tyres, steering and suspension. Reference: The Highway Code — Annexe 6: Vehicle maintenance
Q8. Which of these reduces fuel consumption?
- Accelerating hard between junctions
- Carrying an empty roof rack all year
- Smooth, gentle acceleration, correct tyre pressures, and removing unused roof racks
- Letting the engine idle to warm up before every trip
Answer: C. Aggressive acceleration, underinflated tyres, idling and permanent roof racks all burn extra fuel. Smooth driving can cut consumption by a meaningful margin — and cuts emissions with it. Reference: The Highway Code — rule 123
Frequently asked questions
How many Safety & Your Vehicle questions are in the real theory test?
The DVSA doesn't publish per-topic counts. Your 50 questions are drawn across all 14 official topics, so revise every category.
What is the pass mark for the UK theory test?
You need 43 out of 50 multiple-choice questions correct (86%), plus 44 out of 75 on the hazard perception clips. You must pass both parts in the same sitting.
Are these real DVSA questions?
No — these are original practice questions written to the current DVSA syllabus and The Highway Code. Official revision questions are Crown Copyright and only available from licensed providers.
Revise the other theory test topics
Your 50 test questions are drawn from all 14 official DVSA topics — revise every category, not just this one.
- Alertness
- Attitude
- Essential Documents
- Hazard Awareness
- Incidents, Accidents & Emergencies
- Motorway Rules
- Other Types of Vehicle
- Road & Traffic Signs
- Rules of the Road
- Safety Margins
- Vehicle Handling
- Vehicle Loading
- Vulnerable Road Users
Don't forget part two: read how hazard perception is scored. Booked your test? Find your nearest theory test centre, or book on the official GOV.UK booking service (£23).
All practice questions are original study material written to the current DVSA car theory test syllabus and The Highway Code. They are not actual DVSA exam questions. This site is an independent study resource and is not affiliated with or endorsed by the DVSA.