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Ontario Class B (Bus) Commercial Licence Practice Test 6

  • 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,
1 votes
What you need to know
You’ve reached Practice Test 6! This time, we’re focusing on braking systems, including anti-lock brakes. In Ontario, Class B drivers are required to understand various braking systems as part of the license requirements. The test contains 50 questions, and you’ll need to score at least 80% to pass. Make sure you’re up-to-date with these key topics for the 2024 exam.
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
  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 (you are here)
  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 performing a lane change, you should stay within _______ of the posted speed limit.
  2. When driving a manual transmission vehicle, why should you run the engine in the highest gear range?
  3. Which of the following would NOT be a defect of a passenger seatback or the passenger-protection padding?
  4. Which of the following is NOT a benefit of properly warming up a vehicle?
  5. While the bus is stationary, where should a bus driver continue to look?
  6. A controlled railway crossing may have
  7. A light-rail transit (LRT) train may take up to ________ to stop in an emergency.
  8. A Slow-Moving Vehicle sign should be placed on any vehicle that travels no faster than
  9. A tire that is overinflated or underinflated can
  10. A tractor-trailer travelling at high speeds creates air turbulence in which of the following areas?
  11. A vehicle that is twice the weight of a car and is travelling at twice the speed of that car requires how much braking power to stop in the same distance?
  12. A white diamond marking in your lane indicates that
  13. A white X pavement marking in your lane means that
  14. What is a danger zone?
  15. Which dashboard gauge can help you decide when to upshift?
  16. Airbags are
  17. An engine governor is
  18. An octagonal (eight-sided) red sign is
  19. An oncoming vehicle at night has not dimmed its high-beam headlights. What should you do?
  20. Any defect or deficiency that you find on your bus must be
  21. At a railroad crossing, flashing red lights and ringing bells mean that
  22. At a stop sign, you must
  23. At an intersection with no traffic lights or traffic signs, you should
  24. At an intersection, the traffic light is red, but a police officer motions you to go through. What should you do?
  25. At what speed should you back up your vehicle?
  26. At which of the following engine speeds should you drive your vehicle?
  27. Before you drive your vehicle, you should
  28. Before you drive, you should
  29. Before you enter a curve, what gear should you select?
  30. Before you may turn left at an intersection, you must yield to
  31. Besides regular brake maintenance, who is responsible for ensuring that the brakes of a vehicle are working properly before the vehicle is driven?
  32. Cars A and B have arrived at this intersection at about the same time. Car A wants to turn left and Car B wants to go straight. Who has the right-of-way?
  33. Compounding the air brakes can
  34. Different-sized tires can
  35. Double-clutching is
  36. During a pre-hill inspection of a vehicle equipped with air brakes, you should do which of the following?
  37. During freezing conditions, you should exercise extreme caution when driving through which of the following?
  38. During your brake tests, you find that the brakes are not operating safely. What should you do?
  39. During your pre-trip inspection, you discover a defect that does not affect the safe operation of the vehicle. What should you do?
  40. Every written trip inspection report must include which of the following?
  41. For large commercial vehicles, which of the following are advantages of air brakes as compared with hydraulic brakes?
  42. For optimal safety, your head restraint should be positioned so that its centre is level with
  43. Funeral processions have right-of-way over you…?
  44. How can you downgrade from a commercial licence to a non-commercial licence?
  45. How can you ensure smooth braking of a large commercial vehicle?
  46. How can you tell how much air pressure is in the service reservoirs?
  47. How do you ease your vehicle into a smooth stop?
  48. How often should you look at your mirrors?
  49. How should you drive through a large amount of water on the roadway?
  50. How should you handle driving around a curve?
  51. Idling for longer than five minutes can