Ontario Commercial Drivers License Class D Practice Test 5

Commercial Driver HQ is a website focused on helping new commercial drivers in all provinces and territories in Canada.

Our FREE practice tests are designed to help you succeed when it comes time to write the real test.

Each license type has 5 tests to help you study and become familiar with the rules and regulations of commercial driving. The tests are not identical to the license test you will need to pass, but the questions are similar to what you will find on the real deal.

Compatible on desktop, mobile, and tablet, you can take these tests anywhere you have internet access.

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Created by Commercial Driver HQ

Ontario Class D Practice Test 5

A 20 question practice test to help prepare you for the Class DZ knowledge test in Ontario

1 / 20

What does this yellow warning sign mean?

2 / 20

What don’t a vehicle’s back wheels usually do?

3 / 20

What does this construction sign mean?

4 / 20

The low air pressure warning device needs to be replaced or adjusted if it does not trigger at a minimum level of?

5 / 20

What does this warning sign mean?

6 / 20

Drivers must operate in a cycle. What are the two cycles available to drivers?

7 / 20

What is the gross weight of your vehicle?

8 / 20

If the outer layer of an airline is damaged, but the inner layer is ok, what should you do?

9 / 20

To measure the time it takes to build up pressure in the air system, the engine should be idling between _______________.

10 / 20

How many off-duty hours must a commercial driver have in a day?

11 / 20

Spring brakes will begin to apply when the pressure starts to drop below?

12 / 20

What is the "cut in" level?

13 / 20

At vehicle inspection stations, axles are inspected for?

14 / 20

If you are driving through snow and you see blue flashing lights up ahead, what do you do?

15 / 20

The tallest your vehicle can be is?

16 / 20

What do these signs mean if you see a construction worker holding them up?

17 / 20

Which of these vehicles would usually have an air brake system?

18 / 20

What does this orange sign mean?

19 / 20

What colour will the road generally look in the winter time?

20 / 20

How much space should you give a cyclist when you pass them?

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The average score is 87%


Want to know more? Learn all about getting your DZ drivers license in Ontario

We do our best to keep the questions current and accurate. The testing centres may change the questions on the knowledge tests at any time. Always be prepared for surprises.

Many of the answers to the questions can be found in the driver hand books or learning materials your province provides.

DISCLAIMER: CDHQ is not affiliated with DriveTest or the MTO. These practice tests should not be considered official tests and you are not granted a license for completing them. Our tests are simply a practice tool to help prepare yourself for the real test.