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  • Based on 2024 ON commercial driver's licence manual
  • Updated for December 2024
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.
  • Perfect for first-time and renewal commercial applicants, and those adding endorsements
  • Triple-checked for accuracy
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.
What to expect on the official exam
25

questions

20

correct answers to pass

80

passing score

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?