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ON General Knowledge Test 4

  • 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
4.2 out of 5,
5 votes
What you need to know

Do you want to drive a truck in Ontario? To be a commercial driver in this province, you need a licence that is specific to the type of truck you want to drive. As a truck driver, you are a critical part of the transportation industry. The power and size of large trucks are awe-inspiring. Even while you’re driving safely, the smallest mistake can cause serious damage. Before you can get your commercial driver’s licence, you must pass both a written and practical test. The written test (also known as the Ontario commercial driver’s licence knowledge exam) has several multiple-choice questions. You must get at least an 80% to pass the knowledge examination. This 50-question practice test will help you to prepare for the Ontario (ON) General Knowledge written test required to get your commercial driver’s licence. As you answer the questions on this test, we recommend checking each question’s explanation to gain further insight into the rule behind it. All questions on this test are based on the 2024 ON commercial driver’s guide. 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 (you are here)
  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 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. When you approach a flashing red light at an intersection, you should
  2. You are behind a vehicle that is stopped at a crosswalk. What should you do?
  3. You can avoid getting into a road-rage situation by driving in
  4. A driver attempts to foresee potential collisions and is prepared to avoid them. This driving practice is known as
  5. In the wintertime, asphalt tends to look
  6. On a slippery road, your tires
  7. When driving in Ontario at night, you must use low-beam headlights whenever you are within ________ of an oncoming vehicle.
  8. As you approach an intersection, you notice a pedestrian with a white cane. What should you do?
  9. Every commercial vehicle on the road after dark must have
  10. In Ontario, which driver's licence must you obtain to drive a full-size tractor-trailer?
  11. If you are convicted of ________, four demerit points will be added to your driver's record.
  12. Using a backup alarm device while you're backing up
  13. If a bus driver is convicted of ________, five demerit points will be added to his or her driver's record.
  14. If you are convicted of ________, six demerit points will be added to your driver's record.
  15. If you have accumulated ____ demerit points, the Ministry of Transportation will send you a warning letter.
  16. If you change your name or address, you must notify the Ministry of Transportation within
  17. If you hold a commercial driver's licence, you must submit an annual medical report if you are at least
  18. For commercial drivers, the legal limit of blood alcohol concentration while they drive is
  19. Which of the following actions are illegal?
  20. When can you drive with a suspended licence?
  21. If yours is the first vehicle approaching an intersection with a red light or stop sign, where must you stop?
  22. A Criminal Code driving offence will stay on your driver's record for at least ____ years.
  23. Which of the following are criminal offences under the Criminal Code of Canada?
  24. In Ontario, applicants for a Class _______ licence must complete a Ministry-approved training course.
  25. A commercial driver who is going to transport dangerous goods must receive _________ from his or her current employer.
  26. If you refuse to provide a breath, blood, or urine sample when asked to do so by the police, your licence will be immediately suspended for
  27. A special type of crosswalk is called
  28. If you hold a full Class AZ driver's licence, you can tow trailers whose total gross weight is
  29. In Canada, there are ____ recognized classes of dangerous goods.
  30. In Canada, driving a motor vehicle on public roads is
  31. What is the colour of the school bus arm signal?
  32. If you're required to use an ignition interlock device but you're found to be driving without one, your vehicle will be impounded for at least
  33. If you are convicted of refusing to proceed to an inspection station when asked to do so by a police officer or appointed Ministry of Transportation officer, your licence will be suspended for up to
  34. To drive a school bus with more than 24 passengers, you must hold a _______ licence.
  35. Once your vehicle has gotten underway, check your brakes within
  36. What does a No Standing sign mean?
  37. If the weigh station is open, you should
  38. Within a duration of seven consecutive days, a driver is not allowed to drive after being on-duty for how many hours?
  39. When inspecting power-assisted hydraulic brakes, all of these steps are necessary EXCEPT
  40. What is the vehicle impound duration for a first offence discovered during a commercial vehicle impound program inspection?
  41. Which of the following is incorrect? The hours-of-service rules apply to drivers of which types of vehicles?
  42. When your speed is significantly reduced while ascending a steep incline, what should you do?
  43. Following a period of at least eight hours off-duty, a driver cannot continue to drive after being on-duty for how many hours?
  44. When should the differential lock not be engaged?
  45. Which is not a mandatory detail to be recorded in the daily log?
  46. How long is the impoundment period if the same vehicle is found with crucial defects within a two-year timeframe?
  47. Within a day, how many off-duty hours are required by hours of service rules for the driver?
  48. Why should you slightly release the brakes just before a complete stop?
  49. How many consecutive off-duty hours are required for a driver on the seven-day cycle to initiate a new cycle?
  50. If a driver is operating on a 14-day cycle, how many consecutive hours off-duty must they take to initiate a new cycle?
  51. If the Ministry of Transportation approves it, an Hours-of-Service exemption certificate will give a full exemption that lasts until...
  52. A third or subsequent offence within the same two years results in an impoundment period of...
  53. Inter-axle differential locks are used in which types of vehicles?