Ontario Class A Licence Test 3

Preparing to drive a semi-trailer truck or a long combination vehicle in Ontario? You'll need a Class A commercial driver's licence. The transportation industry in ON is booming, so now is a great time: truck drivers are in high demand. As a Class A licenced commercial driver, you can work for a trucking company as an employee, or for yourself as an owner-operator. But in order to drive one of the largest vehicles on the road, you must first learn to drive carefully and safely. So before you can get your Class 1 licence, you must pass both a written and a practical test. The written test (also known as the Ontario truck driver's knowledge exam) has several multiple-choice questions. This 51-question Class A practice test is a great way to prepare as all questions are based on the official 2025 ON commercial driver's manual. As you answer the questions, we recommend checking each question's explanation to gain some further insight into the rule behind it. Good luck and drive safely!

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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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Our commitment to accuracy and quality in our practice tests

Explore our rigorous, multi-tiered verification process that ensures each question mirrors the official manual for unparalleled accuracy.

Written by Andrei Zakhareuski Updated over a week ago

At Tests.ca, we understand the importance of reliable and accurate practice tests to help you prepare for your driver's knowledge exam. That's why we've developed a meticulous process to create and continually update our practice questions, ensuring they reflect the most current driving laws and regulations.

Here's an inside look at how we maintain the highest quality in our practice tests.

Content Creation and Verification Process

Alignment with Official Driving Handbooks:
Every question we develop is based on the most recent version of each province's official driving manual. Our team regularly monitors each province's official website for the latest updates to ensure our practice tests are always aligned with the most current information.
Community Feedback Integration:
We leverage feedback from our vast community of users to understand which topics are most frequently tested. This helps us focus on the areas that are most relevant and beneficial for your preparation.
Expert Content Creation:
Our in-house editor, Steven, who has extensive experience in driver education, crafts each question with precision. He conducts a thorough review of each question against the official manuals to ensure accuracy.
Rigorous Review Process:
Once Steven has finalized a set of questions, our team conducts a joint review session. This second level of scrutiny involves content accuracy, proofreading, and fact-checking to eliminate any errors.
User Feedback Mechanism:
After a question goes live on our site, we keep the lines of communication open. Each question features a feedback button, inviting users to report any issues or errors. This continuous feedback loop allows us to address and rectify any concerns promptly.
Responsive Updates:
In line with our commitment to accuracy, we quickly update our practice questions to reflect any changes in the provincial government manuals. Additionally, we update the free electronic copy of the state's driver's license manuals on our site, typically within a few days after the government publishes them.

Our thorough quality control process ensures that you have access to practice tests that are as accurate and up-to-date as possible. We believe in the power of well-prepared drivers and are dedicated to providing you with the best study tools to help you succeed on your driver's knowledge exam.

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List of questions (classic view)

Which colour is the trailer supply line?
Without an oversize load permit, the tallest your vehicle can be is
What does this sign mean?
Why are there two service tanks in a modern air brake system?
When must a carrier check your driving record?
What does this sign mean?
When you couple your tractor to a trailer, which of the following is most important?
What does this sign mean?
As a commercial driver, you are expected to practice
How can the trailer hand valve be used?
What does this sign mean?
The braking distance of a tractor-trailer is roughly ________ as the braking distance of a car.
What are the four factors that affect a commercial vehicle's stopping distance?
What does this sign mean?
What is a "glad hand"?
In your daily log, you must record which of the following?
What does this sign mean?
What does this sign mean?
You're driving on a curve to the left. How can you ensure that your trailer's wheels stay in your lane?
What is the wheelbase of a vehicle?
What is a commercial vehicle's danger zone?
To inspect an air brake system, you should wear
While driving your truck, you see an open truck inspection station. What should you do?
What does this sign mean?
Hours of service regulations let a driver choose one of two cycles
What function does the alcohol evaporator perform?
If your vehicle is equipped with antilock brakes (ABS), how should you brake in an emergency?
When must you chock the wheels of your stopped vehicle?
How should a load that projects more than 1.5 metres from the rear of the vehicle be marked?
Which gear should be used to initiate the movement of a loaded tractor-trailer?
You're about to uncouple your tractor from the trailer. After you secure the vehicle, how should you lower the trailer landing gear?
When do you need to have the daily inspection report and associated schedule in the vehicle?
Which of these factors does NOT influence the maximum allowable gross weight of a commercial vehicle?
What is the correct instruction when you see this traffic sign?
What could be the negative effect of continuously letting the clutch slip?
What should you do when climbing a steep hill and your speed is considerably reduced?
Which of these is classified as a minor defect during a daily truck inspection?
What's the maximum permitted driving duration in a single day?
What should you do to successfully navigate a turn while driving?
What should you do after performing a daily inspection and finding no defects?
What is the primary function of a central apron in a roundabout?
When can you operate the vehicle after identifying a major defect during inspection?
Where might you notice excessive lash or free play indicating a defect?
What does this traffic sign indicate?
What is the valid duration for a daily inspection report?
After you start to transport a load, when should you check and adjust the load securement?
Who is responsible for making sure that cargo is safely secured during transport?
What is an essential safety practice when driving on highways with multiple lanes?
What is essential to aid you in doing a daily vehicle inspection?
What does gross weight of a commercial motor vehicle refer to?
The presence of polished or shiny areas at the flanges or clamps of spoke wheels indicates that