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Ontario Class D Licence Test 2

  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Based on 2024 ON commercial driver's licence manual
  • Updated for July 2024
Verified by Steven Litvintchouk, M.S., Chief Educational Researcher, Member of ACES. See our detailed commitment to accuracy and quality in our practice tests.
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ON commercial driver's licence
5 out of 5,
1 votes
What you need to know
Getting ready to drive a heavy truck (a truck with more than two axes) in Ontario? You'll need a Class D commercial driver's licence. The transportation industry in ON is booming, so now is a great time: heavy truck drivers are in high demand. As a Class D licenced commercial driver, you can work for a trucking company as an employee, or for yourself as an owner-operator. But in order to drive one of the largest vehicles on the road, you must first learn to drive carefully and safely. So before you can get your Class D licence, you must pass both a written and a practical test. The written test (also known as the Ontario Class D truck driver's knowledge exam) has several multiple-choice questions. This 25-question Class D practice test is a great way to prepare: all of our questions are based on the official 2024 ON commercial driver's manual. As you answer the questions, we recommend checking the explanations to gain some further insight into the rule behind it. Good luck and drive safely!
What to expect on the official exam



correct answers to pass


passing score

More resources
  1. General Knowledge 1
  2. General Knowledge 2
  3. General Knowledge 3
  4. General Knowledge 4
  5. General Knowledge 5
  6. General Knowledge 6
  7. General Knowledge 7
  8. Road Signs
  9. Road Signs 2
  10. General Knowledge Marathon
  11. General Knowledge Exam Simulator
  12. Class A Licence Test 1
  13. Class A Licence Test 2
  14. Class A Licence Test 3
  15. Class A Licence Marathon
  16. Class A Licence Exam Simulator
  17. Class B Licence Test 1
  18. Class B Licence Test 2
  19. Class B Licence Test 3
  20. Class B Licence Test 4
  21. Class B Licence Test 5
  22. Class B Licence Test 6
  23. Class B Licence Test 7
  24. Class B Licence Test 8
  25. Class B Licence Test 9
  26. Class B Licence Test 10
  27. Class B Licence Test 11
  28. Class B Licence Marathon
  29. Class B Licence Exam Simulator
  30. Class C Licence Test 1
  31. Class C Licence Test 2
  32. Class C Licence Test 3
  33. Class C Licence Test 4
  34. Class C Licence Test 5
  35. Class C Licence Test 6
  36. Class C Licence Test 7
  37. Class C Licence Test 8
  38. Class C Licence Test 9
  39. Class C Licence Test 10
  40. Class C Licence Test 11
  41. Class C Licence Marathon
  42. Class C Licence Exam Simulator
  43. Class D Licence Test 1
  44. Class D Licence Test 2 (you are here)
  45. Class D Licence Test 3
  46. Class D Licence Marathon
  47. Class D Licence Exam Simulator
  48. Class F Licence Test 1
  49. Class F Licence Test 2
  50. Class F Licence Test 3
  51. Class F Licence Test 4
  52. Class F Licence Test 5
  53. Class F Licence Test 6
  54. Class F Licence Test 7
  55. Class F Licence Test 8
  56. Class F Licence Marathon
  57. Class F Licence Exam Simulator
  58. Air Brake Test 1
  59. Air Brake Test 2
  60. Air Brake Test 3
  61. Air Brake Test 4
  62. Air Brake Test 5
  63. Air Brake Test 6
  64. Air Brake Test 7
  65. Air Brake Test 8
  66. Air Brake Test 9
  67. Air Brake Test 10
  68. Air Brake Test 11
  69. Air Brake Test 12
  70. Air Brake Test 13
  71. Air Brake Test 14
  72. Air Brake Marathon
  73. Air Brake Exam Simulator
  74. AZ Licence Exam Simulator
List of questions (classic view)
  1. In an air brake system, what is brake lag time?
  2. When must you chock the wheels of your stopped vehicle?
  3. If your vehicle is equipped with antilock brakes (ABS), how should you brake in an emergency?
  4. The low air pressure warning device needs to be replaced or adjusted if it does not activate at a minimum level of
  5. When can your vehicle be inspected on a highway?
  6. When is an engine retarder most efficient?
  7. In an air brake system, spring brakes are intended for
  8. What does a driver need to transport dangerous goods?
  9. What does this sign mean?
  10. Which of the following are normal responses from an antilock braking system (ABS)?
  11. Who is allowed to refuel a truck hauling propane?
  12. What does this sign mean?
  13. At vehicle inspection stations, axles are inspected for
  14. In a vehicle equipped with air brakes, if the air pressure drops below ________, the spring brakes will begin to apply.
  15. What is the Gross Vehicle Weight (GVW)?
  16. Your vehicle is equipped with air brakes. To make sure the air tanks are securely attached to the vehicle, you should
  17. What does this sign mean?
  18. A construction worker is holding up a sign with these two sides. What do they mean?
  19. What is the Gross Vehicle Weight Rating (GVWR)?
  20. What does this sign mean?
  21. After loading a dump truck, what must you do before moving the vehicle?
  22. Before inspecting your air brakes, you should
  23. The braking distance of a tractor-trailer is roughly ________ as the braking distance of a car.
  24. What is the best way to dry out your brakes after you've driven through water?
  25. Your vehicle is equipped with air brakes. If the outer layer of an air line is damaged, but the inner tube is still OK, what should you do?