ADI part 1: Traffic signs and signals, car control, pedestrians and mechanical knowledge

Signs, road markings and light signals, skid and brake control, vulnerable pedestrians and basic vehicle maintenance. Practise 32 original ADI part 1 questions for this band with instant answers.

  • 32 questions
  • Instructor level

Revision notes

This ADI part 1 band mixes four areas: traffic signs and signals, car control, pedestrians and mechanical knowledge. The real test has 25 questions on it, and you need at least 20 of them right.

Practise reading signs by shape and colour, direction sign colours, road markings, reflective studs and lane control signals. Then test your knowledge of traffic lights and pedestrian crossings, when to use the horn, headlights and fog lights, and how to explain skids, ABS, coasting and braking to a pupil. The pedestrian questions focus on people who need extra care, and the mechanical questions cover tyres, warning signs of faults and what to do if the engine overheats.

Every question is original and comes with an explanation and a reference to The Highway Code. Original practice questions based on The Highway Code. Not the real test questions. MockTheory is not affiliated with or endorsed by the DVSA.

All questions and answers

1A pupil asks how to tell what a sign means from its shape and colour. What do signs with a red circle mostly do?
  1. Tell you what you must not do ✓
  2. Warn you of a hazard ahead
  3. Give you a positive instruction
  4. Give directions to places

Answer: Tell you what you must not do. Signs with red circles are mostly prohibitive. Triangles mostly warn, and blue circles mostly give positive instructions.

Highway Code: Traffic signs

2What do circular signs with a blue background and no red border mostly do?
  1. Tell you what you must not do
  2. Warn of a hazard
  3. Show tourist information
  4. Give a positive instruction ✓

Answer: Give a positive instruction. Signs with blue circles but no red border mostly give positive instructions, such as 'turn left' or 'ahead only'.

Highway Code: Traffic signs

3You're planning a route lesson. What background colour do direction signs on primary routes have?
  1. Blue
  2. White with a black border
  3. Brown
  4. Green ✓

Answer: Green. Primary route signs have green backgrounds. Motorway signs are blue, and non-primary and local routes are white with black borders.

Highway Code: Traffic signs

4Your pupil sees countdown markers on the approach to a motorway exit. What does each bar represent?
  1. 100 yards to the exit ✓
  2. 100 metres to the exit
  3. 50 yards to the exit
  4. One mile to the exit

Answer: 100 yards to the exit. Countdown markers at a motorway exit have bars that each represent 100 yards to the exit.

Highway Code: Traffic signs

5What does a double red line at the edge of the road mean?
  1. No waiting during the times on nearby signs
  2. No stopping at any time ✓
  3. Loading only at any time
  4. No parking on Sundays only

Answer: No stopping at any time. The double red line always means no stopping at any time, except for a licensed taxi or a Blue Badge holder boarding or alighting.

Highway Code: Road markings

6At night on a dual carriageway, what colour reflective studs mark the central reservation?
  1. Amber ✓
  2. Red
  3. Green
  4. White

Answer: Amber. Amber studs mark the central reservation of a dual carriageway or motorway. Red marks the left edge, green marks lay-bys and slip roads, and white marks lanes.

Highway Code rule 132

7The broken white line in the centre of the road has longer lines and shorter gaps than usual. What does this tell your pupil?
  1. Overtaking is allowed with care
  2. The road is about to become one-way
  3. A cycle lane starts soon
  4. There is a hazard ahead ✓

Answer: There is a hazard ahead. When the centre line lengthens and the gaps shorten, there is a hazard ahead. Do not cross it unless you can see the road is clear.

Highway Code rule 127

8What does a white diagonal arrow on a lane control signal mean?
  1. The lane is closed ahead to all traffic
  2. Leave the motorway at the next exit
  3. Change lanes in the direction shown ✓
  4. The lane is open to traffic facing it

Answer: Change lanes in the direction shown. Lane control signals: a green arrow means the lane is open, red crosses mean it's closed, and a white diagonal arrow means change lanes in the direction shown.

Highway Code: Light signals controlling traffic

9Traffic lights are showing red and amber together. What should your pupil do?
  1. Move off, as green is about to show
  2. Move off if the junction is clear
  3. Edge forward over the stop line
  4. Stay stopped until green shows ✓

Answer: Stay stopped until green shows. Red and amber also means 'Stop'. Do not pass through or start until green shows.

Highway Code: Light signals controlling traffic

10A green filter arrow is showing alongside a red light. What does this allow?
  1. All traffic may go when the way is clear
  2. You may go in the direction of the arrow if the way is clear ✓
  3. Only buses and cycles may go
  4. You must wait until the full green shows

Answer: You may go in the direction of the arrow if the way is clear. A green arrow lets you go in the direction shown, whatever other lights are showing, if the way is clear. Only use that lane if you want to go that way.

Highway Code rule 177

11At a zebra crossing, which of these is a legal requirement ('MUST') rather than advice?
  1. Giving way to pedestrians waiting at the kerb
  2. Waving pedestrians across the road
  3. Giving way once a pedestrian has moved onto the crossing ✓
  4. Flashing headlights to invite people to cross

Answer: Giving way once a pedestrian has moved onto the crossing. You MUST give way when a pedestrian has moved onto a zebra crossing. You should also give way to people waiting, but never wave or flash them across.

Highway Code rule 195

12At a pelican crossing the amber light is flashing and nobody is on the crossing. What may your pupil do?
  1. Wait until the light turns green
  2. Stop and wait for pedestrians to arrive
  3. Sound the horn and go on
  4. Go on with caution ✓

Answer: Go on with caution. When the amber light is flashing you MUST give way to pedestrians on the crossing. If there are none, you may proceed with caution.

Highway Code rule 196

13Which type of crossing has NO flashing amber phase for traffic?
  1. Pelican crossing
  2. Zebra crossing
  3. Puffin crossing ✓
  4. School crossing patrol

Answer: Puffin crossing. Toucan, puffin and equestrian crossings have no flashing amber phase. Their light sequence for traffic is the same as at traffic lights.

Highway Code rule 199

14During a lesson in a town centre at midnight, your pupil wants to warn a pedestrian with the horn. When can they use it at this time?
  1. Whenever they feel it is needed
  2. Only if the vehicle is stationary
  3. Only if another road user poses a danger ✓
  4. Never between 11.30 pm and 7 am

Answer: Only if another road user poses a danger. You MUST NOT use the horn while stationary, or in a built-up area between 11.30 pm and 7 am, except when another road user poses a danger.

Highway Code rule 112

15A driver waiting at a junction flashes their headlights at your pupil. What should you teach about this?
  1. It always means the other driver is giving way
  2. Never assume it's an invitation to go; use your own judgement ✓
  3. It means the other driver is about to pull out
  4. It is a legal signal that gives you priority

Answer: Never assume it's an invitation to go; use your own judgement. Only flash headlights to let others know you're there. Never assume flashing headlights invite you to proceed.

Highway Code rules 110 and 111

16When must you switch off your fog lights?
  1. When visibility improves ✓
  2. When you reach a 30 mph area
  3. When you leave a motorway
  4. After 15 minutes of use

Answer: When visibility improves. You MUST NOT use fog lights unless visibility is seriously reduced, and you MUST switch them off when visibility improves, as they dazzle and can hide brake lights.

Highway Code rule 236

17When may you use hazard warning lights while driving?
  1. When you're parked on double yellow lines
  2. On a motorway or unrestricted dual carriageway, to warn of a hazard ahead ✓
  3. When you're towing another vehicle on any road
  4. When you're driving slowly in fog

Answer: On a motorway or unrestricted dual carriageway, to warn of a hazard ahead. You MUST NOT use hazard lights while driving except on a motorway or unrestricted dual carriageway to warn drivers behind of a hazard ahead.

Highway Code rule 116

18The back of your pupil's car skids to the right. What should they do?
  1. Ease off the cause and steer to the right ✓
  2. Brake firmly and steer to the left
  3. Accelerate and steer to the left
  4. Pull the handbrake and steer to the right

Answer: Ease off the cause and steer to the right. Remove the cause of the skid by releasing the brake or easing off the accelerator, then steer in the direction of the skid.

Highway Code rule 119

19How should you explain anti-lock brakes (ABS) to a pupil?
  1. They help keep steering control under hard braking ✓
  2. They always shorten stopping distances
  3. They mean you can brake later for bends
  4. They stop the car skidding on ice

Answer: They help keep steering control under hard braking. ABS should help you keep steering control, but don't assume a car with ABS will stop in a shorter distance.

Highway Code rule 120

20Your pupil has just driven through a deep ford. What should they do next?
  1. Drive faster to dry the brakes
  2. Test the brakes gently at the first safe opportunity ✓
  3. Pump the brakes hard several times
  4. Use the handbrake to stop for a while

Answer: Test the brakes gently at the first safe opportunity. Brakes may be less effective after deep water. Test them gently, and if needed apply light pressure while driving slowly to dry them.

Highway Code rule 121

21Why is coasting downhill with the clutch pressed down dangerous?
  1. It uses far more fuel than staying in gear
  2. It makes the engine overheat
  3. Engine braking is lost and speed builds up quickly ✓
  4. It wears out the clutch plate quickly

Answer: Engine braking is lost and speed builds up quickly. Coasting removes engine braking, lets speed rise quickly downhill, increases footbrake use and affects steering.

Highway Code rule 122

22Your pupil is waiting in a stationary queue of traffic. What does the Highway Code suggest they do with the brakes?
  1. Keep pressing the footbrake so drivers behind can see them
  2. Switch on the hazard warning lights
  3. Hold the car on the clutch
  4. Apply the parking brake and take their foot off the footbrake once traffic behind has stopped ✓

Answer: Apply the parking brake and take their foot off the footbrake once traffic behind has stopped. In stationary queues, apply the parking brake and, once following traffic has stopped, release the footbrake to avoid dazzling drivers behind with brake lights.

Highway Code rule 114

23What is the safest way to brake in normal circumstances?
  1. Late and firmly, then release fully at the end
  2. Early and lightly, then more firmly, easing off just before stopping ✓
  3. In short, hard pumps all the way to a stop
  4. Using the gears only and then the handbrake

Answer: Early and lightly, then more firmly, easing off just before stopping. Brake early and lightly, brake more firmly as you begin to stop, and ease off just before the car comes to rest to avoid a jerky stop.

Highway Code rule 117

24A pedestrian is using a white cane with a red band. What does this tell you?
  1. They are partially sighted only
  2. They may be deafblind ✓
  3. They have a hearing impairment only
  4. They are training a guide dog

Answer: They may be deafblind. A white cane with a red band, or a dog with a red and white harness, shows that someone may be deafblind. They may not see or hear you.

Highway Code rule 207

25According to the Highway Code, what is the chance of a pedestrian being killed if hit by a vehicle at 20 mph?
  1. About 1 in 20 ✓
  2. About 1 in 2
  3. About 1 in 5
  4. About 1 in 100

Answer: About 1 in 20. At 20 mph there is only a 1 in 20 chance of a pedestrian being killed. At 40 mph a vehicle will probably kill any pedestrian it hits.

Highway Code rule 207

26On a country road with no pavement, which side of the road should pedestrians normally walk on?
  1. The left-hand side, with the traffic
  2. The right-hand side, facing oncoming traffic ✓
  3. Whichever side has the wider verge
  4. In the centre of the road

Answer: The right-hand side, facing oncoming traffic. With no pavement, pedestrians should keep to the right so they can see oncoming traffic. Expect them to be walking towards you on your side.

Highway Code rule 2

27Who counts as a pedestrian under the Highway Code?
  1. Only people walking on foot
  2. People on foot and horse riders using the verge
  3. Wheelchair and mobility scooter users as well as people on foot ✓
  4. Anyone on the pavement, including cyclists

Answer: Wheelchair and mobility scooter users as well as people on foot. Only pedestrians may use the pavement, and pedestrians include wheelchair and mobility scooter users.

Highway Code rule H2

28What is the minimum legal tread depth for car tyres?
  1. 1 mm across the full width of the tread
  2. 1.6 mm across the full width, on half the tyre
  3. 2 mm across the central three-quarters
  4. 1.6 mm across the central three-quarters, around the whole tyre ✓

Answer: 1.6 mm across the central three-quarters, around the whole tyre. Cars, light vans and light trailers MUST have at least 1.6 mm of tread across the central three-quarters of the tread and around the entire circumference.

Highway Code: Annex 6

29When should tyre pressures be checked?
  1. Monthly, straight after a long drive
  2. Only at the MOT
  3. Weekly, when the tyres are cold ✓
  4. Daily, when the tyres are warm

Answer: Weekly, when the tyres are cold. Check tyre pressures weekly, before your journey, when tyres are cold. Warm tyres can give a misleading reading.

Highway Code: Annex 6

30A car keeps bouncing after you push down firmly on one corner. What is the most likely fault?
  1. Low tyre pressure
  2. Worn brake pads
  3. Worn shock absorbers ✓
  4. A loose exhaust

Answer: Worn shock absorbers. If a vehicle continues to bounce after you push down on it, the shock absorbers are worn. They should be replaced.

Highway Code: Annex 6

31Your training car pulls to one side when braking. What is the most likely cause?
  1. A brake fault or incorrectly inflated tyres ✓
  2. A worn clutch slipping under load
  3. Low engine oil in the sump
  4. A faulty alternator or flat battery

Answer: A brake fault or incorrectly inflated tyres. Pulling to one side when braking is most likely a brake fault or wrong tyre pressures. Get it checked straight away.

Highway Code: Annex 6

32The engine has overheated during a lesson. When is it safe to remove the coolant filler cap?
  1. Straight away, so the steam can escape
  2. After pouring cold water over the radiator
  3. While the engine is still running
  4. Only after the engine has cooled naturally ✓

Answer: Only after the engine has cooled naturally. Wait until the engine has cooled naturally before removing the coolant cap and adding water or coolant.

Highway Code: Annex 6

Frequently asked questions

What does this ADI part 1 band cover?

Traffic signs and signals, car control, pedestrians and mechanical knowledge. It is one of the 4 categories, with 25 questions in the real test.

How deep do I need to know mechanical topics?

Focus on safety: tyre tread and pressures, warning lights, signs of brake or suspension faults and what to do if the engine overheats. These are covered in Annex 6 of The Highway Code.

Where can I learn every road sign?

Know your traffic signs is free on GOV.UK and explains the vast majority of signs. You can also practise with our road signs test.

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.

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