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  • Based on 2025 ON commercial driver's licence manual
  • Updated for May 2025

FREE Ontario Class A Licence Test

The transportation industry in Ontario offers abundant job opportunities for aspiring commercial drivers, but you need to possess a distinctive skill set to get licensed. Although you must meet several requirements to begin your career, one of the most important early ones is passing the Ontario Class A Commercial Driver’s Knowledge Test. This official knowledge test requires you to exhibit the skills that identify you as a competent driver. Comprehensive training is a necessity to get a solid foundation for building those skills. It may not be as difficult as getting admitted to Queen’s Law School, but you must receive expert training designed to meet your specific needs.

Our Ontario Class A Knowledge Practice Test assesses your understanding of the traffic laws and safe driving practices that make you a skillful driver. It is designed to give you a real-time evaluation of your current skill level and direct your attention to topics you need to study more. It bases the evaluation on your answers to 50 multiple-choice questions similar to those on the official knowledge test. You will receive a starting point for directing the course of your study that makes the most efficient use of your time. By identifying your skill deficiencies, the practice test can address your needs to expand your knowledge base and be thoroughly prepared to pass the official knowledge test on your first attempt.

The Ontario Class A Commercial Driver’s Knowledge Practice Test provides you with the most reliable and authoritative information available. It is based on the most recent Ontario Official Ministry of Transportation (MTO) Truck Handbook. Other on-line resources, such as study guides, aren’t as dependable to fully develop your driving skills because they neglect to expand your knowledge base. Study guides train you to memorize the answers to the questions in a set pattern. In contrast, the practice test is interactive and randomly presents its questions to keep you focused and engaged. If you get a question wrong, the practice test provides a detailed explanation of the correct one. Your knowledge base will rapidly increase because you are being trained to take the logic behind the answer and apply it. You must correctly answer 80% of the official knowledge test questions to receive your commercial learner’s licence. You can depend on the practice test to deliver results that meet and exceed this requirement. The practice test will ignite your passion for learning and using the skills that will drive you along the road to success.

You can enjoy frivolous activities at the May Run in Timmins, but you’ll want to get serious about furthering your driving skills with the practice tests at https://tests.ca/ontario/.
ON driver's license
  • 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.
Ensuring the accuracy and quality of our program is paramount. Learn more about our rigorous standards in our Commitment to Accuracy article.
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List of questions (classic view)
  1. What must you do at a stop sign with a painted stop line?
  2. Over-braking with a trailer can sometimes lead to
  3. What does this sign tell you?
  4. When is a pre-trip inspection required?
  5. What gauges should you check after starting your vehicle?
  6. Which valves make up the tractor protection system?
  7. When coupling a tractor to a semitrailer,
  8. What does this sign mean?
  9. In an air brake system, what is brake lag time?
  10. What does this sign mean?
  11. Before driving down a grade (hill), you should
  12. When inspecting the brake chambers, you should check for which of the following?
  13. The supply line is also called
  14. When brakes become overheated, they also become
  15. Which belts should you check during your pre-trip inspection?
  16. What is the purpose of the National Safety Code?
  17. What is a normal reaction time for a driver?
  18. Most manufacturers of commercial vehicles recommend draining the moisture and oil from an air brake system on a ________ basis.
  19. What is the Gross Vehicle Weight Rating (GVWR)?
  20. Which of these is not a part of a drum brake?
  21. What is the purpose of the slider on a trailer?
  22. What is the most common cause of air loss in a trailer?
  23. What is brake lag time?
  24. What does this sign mean?
  25. Why is it important to know which parts of the air brake system exhaust air?
  26. What's the proper way to confirm that a vehicle passed its annual inspection?
  27. While on duty, under which circumstances can a police officer or appointed ministry officer conduct a safety inspection on your vehicle?
  28. What is an essential component of a well-documented daily inspection report?
  29. As a driver, you are responsible for ensuring that which of these is secured on your vehicle?
  30. A front tire fails the inspection if the tread depth on two adjacent grooves anywhere on the tire is less than
  31. How much uninterrupted off-duty time must a driver take after clocking 13 hours of driving time?
  32. Choose the odd one out: Which of the following is not a recommended safety measure before reversing a vehicle?
  33. When coupling your tractor to a trailer, after you raise and secure the landing gear, what do you do next?
  34. When coupling your tractor to a trailer, once the jaws lock onto the kingpin, what should you do next?
  35. You stopped on an uphill grade. When resuming traffic, what should you do?
  36. Which of these is most important to check underneath the hood?
  37. What does this sign refer to?
  38. What is the crucial requirement when reversing the tractor to couple it with the trailer?
  39. What is the maximum allowable length for a combination vehicle?
  40. The speed limiting system in many commercial vehicles is set to restrict the maximum speed to
  41. How are the dangerous goods being transported on Ontario roads identified?
  42. What must you do if you discover a minor defect during a trip?
  43. Which of the following activities is considered off-duty?
  44. To avoid your vehicle's wheels going over the curb or sidewalk while making a right turn, what should you do?
  45. If after inspecting your vehicle, you find out that the brake lamps aren't functioning, what action should be taken?
  46. Who can demand you to appear at a truck inspection station?
  47. Before putting your vehicle in reverse gear, what should you do?
  48. If a repair technician has installed new wheel fasteners on your vehicle,
  49. You are prohibited from operating a commercial vehicle if you've been on-duty for how many hours in a week?
  50. How should you enter a roundabout?
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