After stopping at the tracks, what must a school bus driver do before crossing?
MPI Professional Driver Practice Test 2026 – Free Manitoba Commercial Questions
Original questions written from the official Manitoba handbook, with an explanation for every answer.
By the Canada Exam Prep Editorial Team ·
- No sign-up
- Every answer explained
- Independent · not a government site
- 240 questions
- 10 practice tests
Your progress
Your topic map
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Answer questions in any practice test, topic quiz, mock exam or the exam simulator. After 5 answers in a topic, it turns red, yellow or green.
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Estimated mock score
Estimate only – not an official predictionAnswer at least 20 questions to see an estimated mock score (you have 0). It is shown as a range, never as a promise.
- Licence classes, testing and medical rulesNot enough data
No answers yet
- Impairment, fatigue and safety equipmentNot enough data
No answers yet
- Fuel-smart driving, night driving and vehicle controlsNot enough data
No answers yet
- Speed, following distance and brakingNot enough data
No answers yet
- Tires, wheels, passing and intersectionsNot enough data
No answers yet
- Backing, parking and railway crossingsNot enough data
No answers yet
- Weather, winter roads, skids and jackknifingNot enough data
No answers yet
- Trip inspections and road test vehicle rulesNot enough data
No answers yet
- Turning, backing and coupling (Class 1 and 3)Not enough data
No answers yet
- Dimensions, weights and loads (Class 1 and 3)Not enough data
No answers yet
- Not enough data
- Not enough data
- Driving a bus and passenger safety (Class 2 and 4)Not enough data
No answers yet
- Air brake basics and the air supplyNot enough data
No answers yet
- Service brakes and spring brakesNot enough data
No answers yet
- Trailer brake subsystemNot enough data
No answers yet
- Foundation brakes, brake demands and complianceNot enough data
No answers yet
- Air brake inspections, tests and brake adjustmentNot enough data
No answers yet
Colours summarize progress from your recent practice answers: red suggests more practice, yellow shows progress, and green shows stronger recent performance. Grey means fewer than 5 answers so far. These indicators do not predict official exam results.
Keep practising
All Manitoba Commercial practice tests
- MPI Class 1 knowledge test40 practice questions on the Class 1 and Class 3 section of the MPI Professional Driver's Manual: turning, coupling, dimensions, loads, dangerous goods and highway trains.
- MPI Class 4 knowledge testFree practice questions on the Class 2 and Class 4 section of the MPI manual: bus and school bus classes, emergency vehicles, bus driving, passenger safety and bus inspections.
- MPI air brake test50 practice questions from the MPI Air Brake Manual (2026): air supply, service and spring brakes, trailer brakes, inspection tests, leak limits and brake adjustment.
- How to get a Class 1 licence in ManitobaHow to get a Class 1 semi-trailer truck licence in Manitoba: who can apply, the medical report, the MPI knowledge test, Authorized Instruction, mandatory entry-level training (MELT), the road test with pre-trip and air brake checks, and fees. Every fact links to mpi.mb.ca.
- Manitoba Commercial study guideFree Manitoba Commercial study guide: 388 key points from the MPI Professional Driver's Manual in plain words, organised by topic, each topic linked to its practice questions.
- Manitoba Commercial Mock Exam 1 – 40 QuestionsTimed practice · 30 minutes · answers explained
- Manitoba Commercial Mock Exam 2 – 40 QuestionsTimed practice · 30 minutes · answers explained
- Manitoba Commercial Mock Exam 3 – 40 QuestionsTimed practice · 30 minutes · answers explained
- Manitoba Commercial Mock Exam 4 – 40 QuestionsTimed practice · 30 minutes · answers explained
- Manitoba Commercial Mock Exam 5 – 40 QuestionsTimed practice · 30 minutes · answers explained
- Manitoba Commercial exam simulator40 new random questions every time, full screen, no hints
- Manitoba Commercial flashcards388 study cards: flip, self-check, review
- Manitoba Commercial study guides & books3 official guides and books, reviewed
Exam facts
Key facts: Manitoba Commercial Knowledge Tests (Class 1–4 and Air Brake)
- Not publishedNumber of questionsMPI does not publish the number of questions; our mock uses 40 as a practice format — confirm with MPINot officially published · MPI — Testing for your professional driver's licence
- Not publishedPass markMPI does not publish a pass mark; our mock uses 80% as a practice standard — confirm with MPINot officially published · MPI — Testing for your professional driver's licence
- 30 minutesTime limit30-minute limit per knowledge test; not open book; no phones or electronic devicesMPI — Testing for your professional driver's licence
- $12 per testFeeKnowledge test $12 (the manual still lists $10); road tests $50 Class 1, 2 or 3, $40 Class 4, $35 air brake practicalMPI — Testing for your professional driver's licence
- EN, FR, PunjabiLanguagesClass 1 and air brake knowledge tests in English, French or Punjabi; Class 2, 3, 4 and school bus in English and FrenchMPI — Testing for your professional driver's licence
- Next working dayRetakesOne knowledge test per class per day; a failed Class 1–4 or air brake knowledge test can be retaken the next working dayMPI — Testing for your professional driver's licence
- 18+, Class 5I/5FEligibilityAt least 18; minimum Class 5I or 5A for Classes 2–4, Class 5F for Class 1; Medical Examination Report and vision standardsMPI — Testing for your professional driver's licence
- Written + practicalAir brake testAir brake knowledge test plus a practical test on your own vehicle; a 5L licence is needed before writing itMPI — Testing for your professional driver's licence
- MELT requiredClass 1 trainingApproved Mandatory Entry-Level Training must be completed before booking the Class 1 road testMPI — Testing for your professional driver's licence
- Free manualsStudy materialMPI Professional Driver's Manual and Air Brake Manual (02/2026), free online as PDFs in English and FrenchMPI Professional Driver's Manual (PDF)
Free practice tests for Manitoba Public Insurance's professional driver knowledge tests: Class 1, 2, 3 and 4, plus the air brake test. Every question is original, written from the MPI Professional Driver's Manual and the MPI Air Brake Manual (February 2026), explains why the right answer is right, and names the manual page it comes from. No sign-up, no limit on attempts, and your progress stays on your own device.
MPI gives you 30 minutes for each knowledge test but does not publish the number of questions or the pass mark. Our mock exam is a 40-question practice format inside that 30-minute limit, drawn from the whole Professional Driver's Manual, with a practice standard of 80 per cent. Use the Class 1 and Class 4 pages to drill your class, the air brake page for the A endorsement, then take timed mocks.
What the test covers
Topics and question bank
- Licence classes, testing and medical rules14 questions
What Class 1 to 4 licences allow in Manitoba, minimum age and Class 5 stage needed, Authorized Instruction and supervising drivers, MELT, knowledge and road test rules, medical and vision standards, US commercial driving and the air brake endorsement.
- Impairment, fatigue and safety equipment14 questions
Impaired driving sanctions, carbon monoxide, emotions, fatigue and sleep debt, hours of service, airbags and seatbelts, distractions, warning reflectors, fire fighting and extinguishers.
- Fuel-smart driving, night driving and vehicle controls13 questions
Fuel efficiency habits, starting and warming up, night driving distances and dimming, hand position, clutch and double-clutching, engine rpm and gear changes, shifting before hills, curves and railway crossings, lane use.
- Speed, following distance and braking14 questions
Speed, weight and stopping force, the danger zone, the four-second rule and length-based count, traffic tempo, tailgaters, the 90 m rule, slow-moving vehicles, snubbing and control speed, retarders, ABS and runaway lanes.
- Tires, wheels, passing and intersections12 questions
Tread depth limits, retreads, tire pressure and heat, wheel fasteners and failures, passing and being passed, lane changes, curves and intersection rules for large vehicles.
- Backing, parking and railway crossings12 questions
Backing rules and guides, leaving alleys and lanes, securing an unattended vehicle, and Manitoba railway crossing distances, prohibitions and when you may cross with lights flashing.
- Weather, winter roads, skids and jackknifing13 questions
Ice and snow, reduced visibility, black ice, Manitoba winter and ice roads, strong winds, hydroplaning, wet brakes, the causes of skids, skid recovery and jackknifing.
- Trip inspections and road test vehicle rules14 questions
Who must do a daily trip inspection, what the report contains, major and minor defects, the road test inspection and vehicle requirements, tread, mud flap and reflective tape rules, hydraulic brake checks, in-service, post-trip and pre-hill inspections.
- Turning, backing and coupling (Class 1 and 3)15 questions
Off-tracking, right and left turns with button hook, extended approach and lane straddling, backing a tractor-trailer, the Class 1 straight line backing test, draw-bar rules, and Manitoba's coupling and uncoupling steps.
- Dimensions, weights and loads (Class 1 and 3)15 questions
Height, width and length limits, permits, utility approvals, escort and pilot vehicles, weight rules and spring restrictions, weigh stations, load distribution, securement, projections, night oversize lights and farm equipment.
- Dangerous goods, special loads, highway trains and tow trucks14 questions
Dangerous goods duties, classes and placards, documents and spill reporting, livestock, hanging meat, bulk and tank loads, highway trains and rear amplification, and tow truck rules.
- Buses, school buses and emergency vehicles (Class 2 and 4)12 questions
Which licence class each bus and school bus needs, school bus stops at railway crossings, emergency vehicle exemptions and duties, and the extra trip inspection items for buses.
- Driving a bus and passenger safety (Class 2 and 4)14 questions
Bus right and left turns, leaving the curb, parked-vehicle clues, passenger safety, interior lights, defects and breakdowns, fuelling, baggage, loading passengers, the driver's vision, standing passengers and refusing passage.
- Air brake basics and the air supply13 questions
The air brake endorsement and learner rules, how air brakes differ from hydraulic brakes, the compressor and governor, normal pressure range, supply and dual tanks, draining, air dryer, alcohol evaporator, gauges, safety valve and low-pressure warnings.
- Service brakes and spring brakes12 questions
The brake pedal and dual circuits, brake chambers, pushrod stroke and adjustment limits, who may adjust brakes, spring brake chambers, caging, the yellow parking control, automatic spring application and DD3 chambers.
- Trailer brake subsystem12 questions
Supply and service lines, gladhands and colour codes, cross-connected lines, the trailer hand valve, the red trailer supply valve, the tractor protection valve and system, automatic trailer spring brakes and spring or service brake priority.
- Foundation brakes, brake demands and compliance11 questions
S-cam, disc and wedge brakes, how speed and weight change stopping distance, brake heat and fade, why adjustment matters, ABS, and the law on operating vehicles with defects.
- Air brake inspections, tests and brake adjustment16 questions
Inspecting linings, chambers, drums, lines, tanks and compressors, the low air warning, build-up, governor, leak, tractor protection and spring brake tests, tug tests, draining, measuring pushrod stroke, long-stroke chambers and the S endorsement.
Try a few
Sample Manitoba Commercial questions
1After stopping at the tracks, what must a school bus driver do before crossing?
- A. Open the service door, look and listen both ways
- B. Turn on the stop arm and alternating lights
- C. Ask a student to watch from the rear window
- D. Turn off the engine and wait one minute
Fully open the service door, look and listen both ways along the tracks, close the door, and move only when it is safe.
2A tire has been run while flat and is hot. What should you do before moving the vehicle?
- A. Drive slowly to the nearest tire shop
- B. Spray it with water from the radiator
- C. Let it cool, or replace it if you must move
- D. Inflate it to normal pressure and drive on
Tires run soft or flat should cool before the vehicle moves; if you must move the vehicle, replace the tire first.
3What do baffles in a tank compartment control?
- A. Forward and backward surge, not side-to-side
- B. The temperature of the liquid
- C. The pressure in the brake system
- D. Side-to-side surge only, not forward and backward
Baffles are walls with holes that reduce the liquid's forward and backward movement; side-to-side movement is not restricted, so take curves carefully.
4During a bus inspection, what must be checked about the emergency exits?
- A. They are covered to keep out the cold
- B. Only the roof hatch needs to be checked
- C. They are locked so passengers cannot open them
- D. They work, with a buzzer, from inside and out
Emergency exits and the warning buzzer must operate from inside and outside, and must not be damaged, blocked or obstructed.
5When must a pilot vehicle follow an overlength vehicle?
- A. Only at night or in poor visibility
- B. When it exceeds 25 m
- C. When it is longer than 30 m
- D. When it exceeds 23 m
A pilot vehicle, equipped under The Highway Traffic Act, must follow a vehicle whose overall length exceeds 30 m.
6You apply the pedal and the trailer hand valve at the same time. What pressure does the trailer get?
- A. The lower of the two pressures
- B. The higher of the two pressures
- C. Only the pedal pressure
- D. The two pressures added together
When the hand valve and brake pedal are used together, the trailer receives the higher pressure through the service line.
7How often must a 55-year-old Class 1 driver submit a Medical Examination Report?
- A. Every five years
- B. Every year
- C. Every three years
- D. Every two years
Class 1 to 4 drivers submit a medical report every five years to age 45, every three years to age 64 and every year from age 65.
8Your ABS engages during a hard stop. What should you do with the brake pedal?
- A. Keep steady pressure; do not pump it
- B. Use only the trailer hand valve
- C. Pump the pedal quickly and repeatedly
- D. Release it completely, then reapply
With ABS, keep applying the pressure you need and do not pump; the system applies and releases up to five times a second, faster than you could pump.
9Except for pole trailers, what is the maximum length of a draw-bar in Manitoba?
- A. 5 m
- B. 1.83 m
- C. 3 m
- D. 10 m
Except for a motor vehicle pulling a pole trailer, the draw-bar or coupling device between vehicles must not exceed five metres.
10When a whole wheel assembly separates, what is the usual cause?
- A. A worn brake lining
- B. A tire with low pressure
- C. A wheel bearing failure
- D. A missing mud flap
When the entire assembly fails it is usually a bearing failure; warning signs include oil leaks from the bearing assembly and very hot hubs.
About the test
About the Manitoba Commercial Knowledge Tests (Class 1–4 and Air Brake)
Manitoba's class licence system separates professional from non-professional drivers. Class 1 is for semi-trailer trucks. Class 2 is for buses seating over 24 passengers and school buses seating over 36 while carrying passengers. Class 3 is for trucks with more than two axles and for trucks towing a unit registered over 4,540 kg. Class 4 covers ambulances and other emergency vehicles, buses seating 10 to 24 and school buses seating 10 to 36. Each class includes the classes below it, and any vehicle with air brakes also needs the air brake endorsement.
To start, you must be at least 18 and hold at least a Class 5I or 5A licence for Classes 2 to 4, or a Class 5F (Full) licence for Class 1. You file a Medical Examination Report, pass the knowledge test for your class, then receive Authorized Instruction and drive with a qualified supervising driver. You may write the knowledge test before your medical is approved, but the medical must be approved before Authorized Instruction is issued. Class 1 applicants must also finish approved Mandatory Entry-Level Training before booking the road test.
MPI says the Class 1 to 4 knowledge tests are based on the Professional Driver's Manual, and the air brake test on the Air Brake Manual. The manual is organised so that Section 2 applies to every class, Section 3 adds information for Class 1 and 3 drivers, and Section 4 adds information for Class 2 and 4 drivers. Our topics follow the same split: General, Class 1 & 3, Class 2 & 4, and Air brake. MPI does not publish how each test is weighted, so our mock is a study format, not MPI's blueprint.
Knowledge tests are not open book, phones and electronic devices are not allowed, and each has a 30-minute limit. Only one knowledge test per class is allowed per day, and if you fail a Class 1, 2, 3, 4 or air brake knowledge test you may retake it on the next working day. The Class 1 and air brake knowledge tests are offered in English, French or Punjabi; Class 2, 3, 4 and school bus tests in English and French. You need a 5L licence before you can write the air brake knowledge test.
Some Manitoba rules differ from other provinces and are worth extra study: a minimum four-second following distance, 90 m between commercial vehicles outside restricted speed areas, railway stops 5 m from the rail in town and 15 m outside, a 5 m draw-bar limit, a 3 psi a minute leak limit for a straight truck or bus, and a low air warning that must come on before 55 psi. This site is independent and is not affiliated with MPI; passing our practice tests does not give you a licence or endorsement.
Study plan
How to prepare
- 1Read the MPI Professional Driver's Manual and Air Brake Manual. Both are free online as PDFs, in English and French, and every question here cites the page it comes from.
- 2Study Section 2 first. It applies to every class and covers speed and space, braking, tires, railway crossings, weather and skids.
- 3Then add your class: Section 3 (turning, coupling, dimensions, loads, dangerous goods, highway trains) for Class 1 and 3, or Section 4 (buses, school buses, emergency vehicles, passengers) for Class 2 and 4. Class 1 and 3 drivers are also expected to know Section 4.
- 4Make a list of Manitoba's numbers: 4,540 kg towed weight, the four-second rule, 90 m following distance, 5 m and 15 m railway stops, 30 m parking from a crossing, 4.15 m, 2.6 m, 12.5 m, 21.5 m and 23 m size limits, 3 mm and 2 mm tread depths.
- 5For air brakes, learn MPI's test values: low air warning by 55 psi, cut-out 120–145 psi, cut-in at least 100 psi, build-up 85 to 100 psi in two minutes, leak limits of 3, 4 and 6 psi a minute, trailer supply valve closing before 20 psi, and trailer spring brakes applying below 60 psi.
- 6Practise the air brake inspection out loud. The practical test is done without a checklist, and you must bring chocks, a watch, chamber sizes, a way to hold the pedal and tools to mark and measure pushrod stroke.
- 7Take a timed 40-question mock and aim for 36 or more on two mocks in a row. MPI's real tests have a 30-minute limit per test.
- 8Book through an Autopac agent, bring ID and your Medical Examination Report, and plan for one knowledge test per class per day.
FAQ
Manitoba Commercial test questions people ask
How many questions are on the MPI Class 1 knowledge test?
MPI does not publish the number of questions or a pass mark for the Class 1 to 4 knowledge tests. It does publish a 30-minute time limit. Our mock uses 40 questions as a practice format; confirm the current format with MPI or your Autopac agent.
What is the pass mark for MPI's professional knowledge tests?
MPI does not publish a pass mark. Our mock exam uses 80 per cent (32 of 40) as a practice standard. Aim well above it before you book.
How much does an MPI knowledge test cost?
MPI's testing page lists $12 per knowledge test (the Professional Driver's Manual still shows $10). Road tests are listed at $50 for Class 1, 2 or 3, $40 for Class 4 and $35 for the air brake practical. Fees can change, so check before you go.
Can I take the Class 1 or air brake test in Punjabi?
Yes. MPI offers the Class 1 and air brake knowledge tests in English, French or Punjabi. Class 2, 3, 4 and school bus tests are offered in English and French. Say which language you want when you book.
What if I fail a knowledge test?
You may retake a Class 1, 2, 3, 4 or air brake knowledge test on the next working day. Only one knowledge test per class is allowed each day.
What licence do I need before I can start?
You must be at least 18. For Classes 2 to 4 you need at least a Class 5I or 5A licence; for Class 1 you need a Class 5F (Full) licence. You also need a Medical Examination Report and, for the air brake test, at least a 5L licence.
Is MELT required for Class 1 in Manitoba?
Yes. You must show you completed an approved Mandatory Entry-Level Training course before you can book the Class 1 road test. Practice hours as a Class 1A learner do not count toward MELT.
Does MPI have its own practice quizzes?
Yes. MPI's website has official driving quizzes for each licence class. They are a good extra check, but they are not the test questions. Our questions are written from the manuals and explain each answer with a page reference.
Are these the real MPI test questions?
No. MPI's test questions are not public. Every question here is original, written by us from the official MPI manuals, and cites the page it comes from. We are not affiliated with MPI.
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