Ontario Commercial Class A Driving Test
Part 4

Ontario Commercial Class A Driving Test is a crucial step for individuals who want to obtain a Class A commercial driver’s license (CDL) in the province of Ontario, Canada. A Class A CDL allows you to operate various types of commercial vehicles, including tractor-trailers, semi-trucks, and other large vehicles. Passing this test requires a good understanding of safe driving practices, regulations, and specific skills related to commercial driving.

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Ontario Commercial Driving Test Class A Parts 4

1 / 34

What should you do if you have begun crossing a set of railroad tracks and the crossing lights begin to flash?

2 / 34

Which of the following is not one of the 'distractions' that a commercial vehicle driver would be fined for under the Distracted Driving Law of the Traffic Safety Act?

3 / 34

If you are a driver of persons with disabilities on a city bus, you should:

4 / 34

What does a white diamond on a black background featured on a 'reserved lane' sign indicate?


5 / 34

What does this sign mean?

6 / 34

Which of the following can commercial drivers not do while driving according to the Distracted Driving Law?

7 / 34

To lower the risk of fire, you should:

8 / 34

The law requires that the wheels of a parked vehicle be no farther than what distance from the curb?

9 / 34

When driving a vehicle that is transporting dangerous goods, all pertinent documents should be located where?

10 / 34

What is the symbol for a non-flammable, non-toxic compressed gas?

11 / 34

What should you do when you approach a crossing in a large commercial vehicle and you notice that there is a STOP sign facing you on the opposite side of the tracks?

12 / 34

When entering a right curve in a large vehicle, the driver should:

13 / 34

What does this sign mean?

14 / 34

What does this sign mean?

15 / 34

When reversing a semi-trailer, you should:

16 / 34

What does this Sign mean?

17 / 34

When conversing with or offering help to someone with disabilities, it is important to:

18 / 34

What does this sign mean?

19 / 34

Under what conditions would a private passenger vehicle not be considered ‘for hire' under the Operator Licensing and Vehicle Control Regulation?

20 / 34

Which of the vehicles below would be required to stop at all uncontrolled railway crossings?


  • a. A 16-passenger tour bus
  • b. A truck that has just finished unloading a delivery of flammable liquids
  • c. A semi-trailer carrying corrosive materials
  • d. An ambulance



Why are railway crossings potentially more dangerous for larger, heavier commercial vehicles?


  • a. These vehicles need more time to clear a crossing
  • b. These vehicles need to stop farther away from a crossing before proceeding safely
  • c. These vehicles need more speed to clear the crossing
  • d. These vehicles have to overcome the centrifugal force acting upon them



Corrosive materials can corrode:


  • a. Internal tissue
  • b. All answers are correct
  • c. Human skin
  • d. Metal



If a 'reserved lane' sign includes a list of hours of the day or days of the week on it, what do these mean?


  • a. They indicate when the vehicles represented on the sign are not permitted to drive in that 
  • b. They indicate when any vehicle can drive in that lane
  • c. They indicate when that lane is reserved
  • d. They indicate when that lane is not reserved



When reversing a semi-trailer, you should:


  • a. Honk the horn only if there are other vehicles or bystanders in the vicinity
  • b. Turn the steering wheel in the opposite direction to where you want the trailer to go
  • c. Tap the throttle gently to begin reversing
  • d. Turn the steering wheel in the same direction to where you want to go



If safety marks are needed to indicate the presence of dangerous goods, where on the vehicle should they be placed?

21 / 34

When is it safe to remove the safety marks from a vehicle that is carrying dangerous goods?

22 / 34

In what situations would the use of CB radios be exempt from the Distracted Driving Law?

23 / 34

What is the best solution for preventing driver fatigue?

24 / 34

When are drivers of emergency vehicles are exempt from the Distracted Driving Law?

25 / 34

When a driver is making more than one delivery of dangerous goods, he or she should make note of the change in the quantity of dangerous goods on the shipping document when?

26 / 34

If a 'reserved lane' sign includes a list of hours of the day or days of the week on it, what do these mean?

27 / 34

When should you use a guide to assist with reversing?

28 / 34

Which best describes the effect of centrifugal force on a vehicle when entering a curve?

29 / 34

What does this sign mean?

30 / 34

What does this sign mean in commercial vehicles?

31 / 34

What are the warning signs of driver fatigue?

32 / 34

When do most fatigue-related collisions occur?

33 / 34

For what class of hazardous materials must a special document be carried in the vehicle that indicates the name of the authorized driver and is signed by the owner?

34 / 34

What is considered a safe distance from the bus to bring your passengers if you notice a fire while on route?

Your score is

The average score is 28%


Driver's Handbook

Ontario Class A Knowledge Handbook is your indispensable companion on the journey to becoming a safe and informed driver. It offers a wealth of information, making it easier for you to understand and adhere to road rules and safety guidelines. So, before you hit the road, grab your copy, study it diligently, and confidently embark on your driving adventure in Canada.

Watch our Videos

Ontario Class A Driving Knowledge Test videos are your key to conquering the written exam. With engaging visuals, expert explanations, and practice opportunities, these videos will help you prepare efficiently and with confidence. So, don’t stress about your upcoming test—watch our video guide and cruise smoothly towards success.

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