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  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Based on 2024 ON commercial driver's licence manual
  • Triple-checked for accuracy
  • Updated for December 2024
What you need to know
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.

If you want to drive a truck in Ontario, you need a commercial truck driver’s licence. With a commercial driver’s licence, you can work for a trucking company as an employee or work for yourself as an owner-operator. The transportation industry in Ontario is booming, and truck drivers are in high demand. As a driver of one of the largest vehicles on the road, you must study and practice to learn to drive carefully and safely. Before you can get your commercial driver’s licence, you must pass both a written and a practical test. The written test (also known as the Ontario truck driver’s licence knowledge exam) has several multiple-choice questions. You must get at least an 80% to pass the knowledge exam. The knowledge test for each class of licence typically takes approximately 30 minutes. For the practical test, you will meet with an examiner to demonstrate your knowledge of the operation of a truck. The official Commercial Driver’s Handbooks are great resources, but they lack practice. This 50-question ON General Knowledge practice test is a great way to start as it covers the basics of commercial driving in Ontario. All questions are based on the official 2024 ON commercial driver’s manual. As you answer the questions, we recommend checking each question’s explanation to gain some further insight into the rule behind it. Good luck and drive safely!

What to expect on the official exam
50

questions

40

correct answers to pass

80

passing score

List of questions (classic view)
  1. What should you do to enter a freeway?
  2. You're approaching a red traffic signal light, but a police officer motions you to go through. What should you do?
  3. You're driving a tractor-trailer. While rounding a right curve on a two-way road, you should
  4. When can a police officer inspect your vehicle?
  5. In Ontario, you must not park or leave your vehicle on a rural roadway unless there is a clear view for at least ________ in both directions.
  6. When should you perform a circle check of your commercial motor vehicle?
  7. If you're approaching a railway crossing at which a signal device or flagperson is warning of an approaching train, you must
  8. If a commercial motor vehicle becomes disabled on a roadway at night, flares or reflectors must be placed approximately _________ in front of and behind the vehicle.
  9. Under all conditions, you should drive at a speed that will allow you to
  10. Who is responsible for the safe operation of a motor vehicle?
  11. A licensed driver who wants to learn how to drive a tractor-trailer must
  12. When uncoupling a combination vehicle (such as a tractor-trailer), which of the following is the next step after you've lowered the landing gear?
  13. Any load which projects from the rear of a vehicle by at least 1.5 metres (5 feet) must be marked by
  14. You're driving a vehicle equipped with air brakes. You notice that when you brake, the service brakes aren't holding even though air pressure is satisfactory. What should you do?
  15. To perform the pre-trip inspection of the air brakes, which of the following should you do first?
  16. To enter a highway from a private road or driveway, you should
  17. What is the gross weight of a vehicle?
  18. Ontario law does NOT require ________ on a motor vehicle.
  19. In Ontario, the maximum speed limit on a rural highway is ________ except where otherwise posted.
  20. When you back your tractor to couple a semi-trailer, the fifth wheel opening must be in direct line with
  21. When travelling at over 60 km/h (40 mph), a commercial truck driver must maintain a following distance of at least _________ behind the vehicle ahead, except when passing.
  22. The driver must carry a daily log with entries for the past
  23. Drivers are exempted from keeping a daily log if they drive within a radius of
  24. The driver's log book must contain which of the following entries?
  25. Electronic recording of log entries is
  26. What is the maximum accepted width for commercial motor vehicles?
  27. After a driver receives a dangerous goods training certificate, what happens to it?
  28. Who is responsible for applying for a CVOR certificate?
  29. Which of the following is not a prerequisite for getting a Class A or D licence?
  30. What is the minimum weight requirement for trucks to operate with a CVOR certificate?
  31. If an operator's Safety Rating becomes unacceptable, all of the following may happen EXCEPT
  32. Which of these vehicles does a Class A licence allow you to operate?
  33. When is a health professional required to inform the licensing authorities about a driver's condition?
  34. What is the maximum allowed length for a vehicle combination, except for special double-trailer combinations?
  35. When applying for a Class A or D licence, which tests have a fixed duration?
  36. What is considered a Restricted Class A configuration?
  37. What is the weight requirement for a vehicle to be operated with a Class D driver's licence?
  38. How is registered gross weight defined?
  39. What is the purpose of the Commercial Vehicle Operator Registration (CVOR)?
  40. How long do items remain on the operator's CVOR record after an offence?
  41. What is the height limit for all vehicles, including loads?
  42. What is the minimum age to get a Class A or D licence?
  43. What type of licence will a driver receive after passing a Class A road test with a vehicle that doesn't meet the full Class A requirements?
  44. Who must provide training for drivers transporting dangerous goods?
  45. How is gross weight defined?
  46. The pyrometer is a dashboard gauge that measures
  47. Which of these produces electricity to keep the vehicle's batteries charged?
  48. The difference in electrical charge potential between two points in a circuit acts as a kind of pressure to make an electrical current flow. This pressure or potential difference is usually measured in
  49. You may not drive a tractor-trailer if the semi-trailer's length exceeds _______ unless you obtain an oversize permit.
  50. What is the maximum permitted width of a semi-trailer?