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Ontario Class A Licence Test 3

  • 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,
2 votes
What you need to know
Preparing to drive a semi-trailer truck or a long combination vehicle in Ontario? You'll need a Class A commercial driver's licence. The transportation industry in ON is booming, so now is a great time: truck drivers are in high demand. As a Class A 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 1 licence, you must pass both a written and a practical test. The written test (also known as the Ontario truck driver's knowledge exam) has several multiple-choice questions. This 51-question Class A practice test is a great way to prepare as 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



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 (you are here)
  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
  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. Which colour is the trailer supply line?
  2. Without an oversize load permit, the tallest your vehicle can be is
  3. What does this sign mean?
  4. Why are there two service tanks in a modern air brake system?
  5. When must a carrier check your driving record?
  6. What does this sign mean?
  7. When you couple your tractor to a trailer, which of the following is most important?
  8. What does this sign mean?
  9. As a commercial driver, you are expected to practice
  10. How can the trailer hand valve be used?
  11. What does this sign mean?
  12. The braking distance of a tractor-trailer is roughly ________ as the braking distance of a car.
  13. What are the four factors that affect a commercial vehicle's stopping distance?
  14. What does this sign mean?
  15. What is a "glad hand"?
  16. In your daily log, you must record which of the following?
  17. What does this sign mean?
  18. What does this sign mean?
  19. You're driving on a curve to the left. How can you ensure that your trailer's wheels stay in your lane?
  20. What is the wheelbase of a vehicle?
  21. What is a commercial vehicle's danger zone?
  22. To inspect an air brake system, you should wear
  23. While driving your truck, you see an open truck inspection station. What should you do?
  24. What does this sign mean?
  25. Hours of service regulations let a driver choose one of two cycles
  26. What function does the alcohol evaporator perform?
  27. If your vehicle is equipped with antilock brakes (ABS), how should you brake in an emergency?
  28. When must you chock the wheels of your stopped vehicle?
  29. How should a load that projects more than 1.5 metres from the rear of the vehicle be marked?
  30. Which gear should be used to initiate the movement of a loaded tractor-trailer?
  31. You're about to uncouple your tractor from the trailer. After you secure the vehicle, how should you lower the trailer landing gear?
  32. When do you need to have the daily inspection report and associated schedule in the vehicle?
  33. Which of these factors does NOT influence the maximum allowable gross weight of a commercial vehicle?
  34. What is the correct instruction when you see this traffic sign?
  35. What could be the negative effect of continuously letting the clutch slip?
  36. What should you do when climbing a steep hill and your speed is considerably reduced?
  37. Which of these is classified as a minor defect during a daily truck inspection?
  38. What's the maximum permitted driving duration in a single day?
  39. What should you do to successfully navigate a turn while driving?
  40. What should you do after performing a daily inspection and finding no defects?
  41. What is the primary function of a central apron in a roundabout?
  42. When can you operate the vehicle after identifying a major defect during inspection?
  43. Where might you notice excessive lash or free play indicating a defect?
  44. What does this traffic sign indicate?
  45. What is the valid duration for a daily inspection report?
  46. After you start to transport a load, when should you check and adjust the load securement?
  47. Who is responsible for making sure that cargo is safely secured during transport?
  48. What is an essential safety practice when driving on highways with multiple lanes?
  49. What is essential to aid you in doing a daily vehicle inspection?
  50. What does gross weight of a commercial motor vehicle refer to?
  51. The presence of polished or shiny areas at the flanges or clamps of spoke wheels indicates that