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FREE ON Commercial Driving Licence Diagnostic Test 2024

4.86 out of 5 • 7 votes.
Based on 2024 ON commercial driver's license manual Instant feedback
Try this ON commercial driving licence diagnostic test to get a rough idea of how much you know about commercial driving rules in Ontario. This test contains 25 multiple-choice questions on a variety of topics in commercial driving. It will help you quickly identify gaps in your knowledge, which will be especially useful if you're just starting to prepare for the commercial driving licence knowledge exams.
Ensuring the accuracy and quality of our practice tests is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.

Perfect for:

  • First-time ON commercial license applicants
  • Existing commercial license holders adding endorsements
  • ON commercial license renewal applicants

What to expect on the actual ON commercial license exam:

  • 40 questions
  • 32 correct answers to pass
  • 80% passing score

More FREE ON Commercial Driving 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
  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 Marathon
  56. Class F Licence Exam Simulator
  57. Air Brake Test 1
  58. Air Brake Test 2
  59. Air Brake Test 3
  60. Air Brake Test 4
  61. Air Brake Test 5
  62. Air Brake Test 6
  63. Air Brake Test 7
  64. Air Brake Test 8
  65. Air Brake Test 9
  66. Air Brake Test 10
  67. Air Brake Test 11
  68. Air Brake Test 12
  69. Air Brake Test 13
  70. Air Brake Test 14
  71. Air Brake Marathon
  72. Air Brake Exam Simulator
  73. AZ Licence Exam Simulator

List of questions (classic view)

  1. If the driver defers some off-duty time to the following day, his or her total driving time in two days must not exceed
  2. To perform the pre-trip inspection of the air brakes, which of the following should you do first?
  3. The driver must carry copies of the daily logs for the past
  4. If the weigh station is open, you should
  5. If you feel drowsy, sleepy or fatigued, what should you do?
  6. How can you improve your vehicle's fuel economy while you're behind the wheel?
  7. Provincial/Territorial authorities recommend that every commercial vehicle carry
  8. A professional driver is expected to demonstrate
  9. When are you required to stop for a stopped school bus with red lights flashing?
  10. If you're approaching a railway crossing at which a signal device or flagperson is warning of an approaching train, you must
  11. What does this sign mean?
  12. What does this road sign mean?
  13. What does this road sign mean?
  14. What does this road sign mean?
  15. What does this sign mean?
  16. What does this sign mean?
  17. What does this road sign mean?
  18. What does this road sign mean?
  19. What does this sign mean?
  20. What does this sign mean?
  21. What does this sign mean?
  22. What does a sign with a red circle and a diagonal red bar mean?
  23. If a red X signal is displayed over your lane, you must
  24. What does this road sign mean?
  25. What does this road sign mean?