Accidents: HGV theory test questions
What to do at a breakdown or collision, first aid basics, dangerous goods incidents and your legal duties. Practise 15 free accidents questions with instant answers and explanations – no sign-up.
- 15 questions
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- Highway Code references
Accidents: revision notes
Knowing what to do at a breakdown or collision protects you, your passengers or load, and other road users. Stay calm and deal with danger first.
- Make it safe: use hazard warning lights, ask drivers to switch off engines and stop anyone smoking. Use a warning triangle at least 45 metres behind on ordinary roads, never on motorways.
- Get help: call 999 or 112 with your exact location and details of any casualties.
- First aid: don't move casualties unless they're in danger, and don't remove a motorcyclist's helmet unless essential. For CPR, press 5 to 6 cm deep about twice a second. Cool burns for at least 20 minutes.
- Legal duties: if you're involved in a collision causing damage or injury, you must stop. If someone is injured and you can't show insurance, report it within 24 hours and produce insurance within seven days.
At a breakdown on a level crossing, get everyone out and clear first. Keep well away from vehicles carrying dangerous goods.
All accidents questions and answers
Revise every question in this topic. Tap a question to see the correct answer and why.
1Your vehicle has broken down on a single carriageway road. How far behind it should you place a warning triangle?
- At least 10 metres
- At least 25 metres
- At least 45 metres ✓
- At least 100 metres
Answer: At least 45 metres. Place a warning triangle at least 45 metres behind your vehicle on the same side of the road. Never use one on a motorway.
The Highway Code: rule 276
2You're involved in a collision that damages another vehicle. What must you do?
- Drive on and phone the police later
- Stop only if someone is injured
- Stop ✓
- Leave a note and drive on if you're running late
Answer: Stop. If you're involved in a collision that causes damage or injury to any other person, vehicle, animal or property, you must stop.
The Highway Code: rule 286
3Someone is injured in a collision you were involved in, and you couldn't show your insurance at the scene. When must you report it to the police?
- Within 7 days
- As soon as possible, and in any case within 24 hours ✓
- Within 48 hours
- Only if the police contact you
Answer: As soon as possible, and in any case within 24 hours. You must report it to the police as soon as possible and within 24 hours. You must then produce your insurance certificate within seven days.
The Highway Code: rule 287
4You arrive at an incident involving a vehicle carrying dangerous goods. What should you do?
- Keep well away and give the emergency services details of the labels and markings ✓
- Try to rescue the driver straight away
- Use your mobile phone right next to the vehicle
- Move the vehicle to the side of the road
Answer: Keep well away and give the emergency services details of the labels and markings. Keep well away, don't smoke, and call the emergency services with as much information as possible about the vehicle's markings. Don't become a casualty yourself.
The Highway Code: rule 285
5You need to give CPR to an adult casualty. How should you press on the chest?
- About 1 centimetre deep, once every 5 seconds
- About 10 centimetres deep, once a second
- Gently, about once every 2 seconds
- Around 5 to 6 centimetres deep, about twice a second ✓
Answer: Around 5 to 6 centimetres deep, about twice a second. Press down hard and fast in the centre of the chest, around 5 to 6 centimetres, about twice a second. Don't stop until help arrives.
The Highway Code: Annex 7
6A casualty has a burn. How long should you cool it with clean, cool water?
- About 1 minute
- At least 2 hours
- About 5 minutes
- At least 20 minutes ✓
Answer: At least 20 minutes. Cool a burn for at least 20 minutes with plenty of clean, cool water. Don't try to remove anything stuck to the burn.
The Highway Code: Annex 7
7At an incident, an injured motorcyclist is lying in the road. What should you NOT do?
- Call the emergency services
- Warn other traffic
- Remove their helmet unless it's essential ✓
- Reassure them
Answer: Remove their helmet unless it's essential. Don't remove a motorcyclist's helmet unless it's essential and you're trained to, as this could make an injury worse.
The Highway Code: rule 283
8There's a fire in the engine compartment of your vehicle. What should you do?
- Open the engine cover to tackle the fire
- Get everyone out and away, and call the fire brigade ✓
- Drive on to find water
- Pour water directly on the engine
Answer: Get everyone out and away, and call the fire brigade. Get everyone to a safe place and call the fire brigade. Don't try to put out a fire in the engine compartment, because opening it will make the fire flare.
The Highway Code: Annex 6
9Your vehicle breaks down on a motorway and you're able to stop on the hard shoulder. How should you leave the vehicle?
- By the door furthest from the traffic, then wait behind the barrier if possible ✓
- By the door nearest the traffic to place a warning triangle
- You should stay in the cab with your seat belt on in all cases
- By any door, then stand behind the vehicle
Answer: By the door furthest from the traffic, then wait behind the barrier if possible. Get out on the side away from traffic if it's safe, and wait well away from the vehicle, behind any safety barrier. Don't place a warning triangle on a motorway.
The Highway Code: rule 277
10You're first to arrive at a crash. Which TWO should you do? Mark two answers.
- Move the injured out of their vehicles straight away
- Give casualties something to drink
- Switch on your hazard warning lights ✓
- Ask the drivers to switch off their engines ✓
Answer: Switch on your hazard warning lights; Ask the drivers to switch off their engines. Warn other traffic with your hazard lights and ask drivers to switch off their engines to reduce the risk of fire. Don't move casualties unless they're in danger, and don't give them anything to eat or drink.
The Highway Code: rule 283
11A casualty is unconscious but breathing normally. What should you do?
- Start chest compressions
- Sit them upright
- Place them in the recovery position ✓
- Give them water
Answer: Place them in the recovery position. If someone is unconscious and breathing, put them in the recovery position until medical help arrives. Keep checking their breathing.
The Highway Code: Annex 7
12Your lorry hits a railway bridge. What should you do first?
- Drive on if the lorry can still move
- Report it straight away to the railway using the number on the bridge, or call 999 ✓
- Check the bridge yourself, then carry on
- Wait until you're back at the depot to report it
Answer: Report it straight away to the railway using the number on the bridge, or call 999. A bridge strike could make the railway unsafe. Report it at once so trains can be stopped and the bridge checked.
The Highway Code: rule 286
13Some of your load falls onto a quiet single carriageway road. What should you do?
- Remove it only if it's safe to do so ✓
- Leave it and drive on
- Stop in the middle of the road to collect it
- Always wait for the police before touching it
Answer: Remove it only if it's safe to do so. On roads other than motorways and high-speed roads, you should only remove an obstruction if it's safe. Warn other traffic first.
The Highway Code: rule 280
14Your tanker carrying dangerous goods is involved in a crash. What will help the emergency services most?
- The name of the customer you were delivering to
- The time you started work
- The tanker's fuel economy
- Details of the load and its hazard warning plates ✓
Answer: Details of the load and its hazard warning plates. Information about the substance and its hazards helps the emergency services deal with the incident safely.
The Highway Code: rule 285
15Your lorry breaks down on a level crossing. After getting yourself clear, what should you do?
- Try to push the lorry clear on your own
- Wait in the cab for the recovery truck
- Use the railway telephone, if there is one, to tell the signal operator ✓
- Stand on the crossing to warn the train
Answer: Use the railway telephone, if there is one, to tell the signal operator. Get clear first, then use a railway telephone if one is available and follow the signal operator's instructions.
The Highway Code: rule 299
Frequently asked questions
Where should I put a warning triangle?
At least 45 metres behind your vehicle on the same side of the road. Never use one on a motorway.
What should I do first if my bus breaks down on a level crossing?
Get all the passengers off and clear of the crossing straight away, then use the railway telephone if there is one.
Do I have to report a collision to the police?
If someone is injured and you don't produce your insurance at the scene, you must report it as soon as possible and within 24 hours.
Original practice questions based on The Highway Code (Open Government Licence v3.0). Not the real test questions. MockTheory is not affiliated with or endorsed by the DVSA.
