ON General Knowledge Test 4

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 2025 ON commercial driver’s guide. Good luck and drive safely!

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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.
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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)

When you approach a flashing red light at an intersection, you should
You are behind a vehicle that is stopped at a crosswalk. What should you do?
You can avoid getting into a road-rage situation by driving in
A driver attempts to foresee potential collisions and is prepared to avoid them. This driving practice is known as
In the wintertime, asphalt tends to look
On a slippery road, your tires
When driving in Ontario at night, you must use low-beam headlights whenever you are within ________ of an oncoming vehicle.
As you approach an intersection, you notice a pedestrian with a white cane. What should you do?
Every commercial vehicle on the road after dark must have
In Ontario, which driver's licence must you obtain to drive a full-size tractor-trailer?
If you are convicted of ________, four demerit points will be added to your driver's record.
Using a backup alarm device while you're backing up
If a bus driver is convicted of ________, five demerit points will be added to his or her driver's record.
If you are convicted of ________, six demerit points will be added to your driver's record.
If you have accumulated ____ demerit points, the Ministry of Transportation will send you a warning letter.
If you change your name or address, you must notify the Ministry of Transportation within
If you hold a commercial driver's licence, you must submit an annual medical report if you are at least
For commercial drivers, the legal limit of blood alcohol concentration while they drive is
Which of the following actions are illegal?
When can you drive with a suspended licence?
If yours is the first vehicle approaching an intersection with a red light or stop sign, where must you stop?
A Criminal Code driving offence will stay on your driver's record for at least ____ years.
Which of the following are criminal offences under the Criminal Code of Canada?
In Ontario, applicants for a Class _______ licence must complete a Ministry-approved training course.
A commercial driver who is going to transport dangerous goods must receive _________ from his or her current employer.
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
A special type of crosswalk is called
If you hold a full Class AZ driver's licence, you can tow trailers whose total gross weight is
In Canada, there are ____ recognized classes of dangerous goods.
In Canada, driving a motor vehicle on public roads is
What is the colour of the school bus arm signal?
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
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
To drive a school bus with more than 24 passengers, you must hold a _______ licence.
Once your vehicle has gotten underway, check your brakes within
What does a No Standing sign mean?
If the weigh station is open, you should
Within a duration of seven consecutive days, a driver is not allowed to drive after being on-duty for how many hours?
When inspecting power-assisted hydraulic brakes, all of these steps are necessary EXCEPT
What is the vehicle impound duration for a first offence discovered during a commercial vehicle impound program inspection?
Which of the following is incorrect? The hours-of-service rules apply to drivers of which types of vehicles?
When your speed is significantly reduced while ascending a steep incline, what should you do?
Following a period of at least eight hours off-duty, a driver cannot continue to drive after being on-duty for how many hours?
When should the differential lock not be engaged?
Which is not a mandatory detail to be recorded in the daily log?
How long is the impoundment period if the same vehicle is found with crucial defects within a two-year timeframe?
Within a day, how many off-duty hours are required by hours of service rules for the driver?
Why should you slightly release the brakes just before a complete stop?
How many consecutive off-duty hours are required for a driver on the seven-day cycle to initiate a new cycle?
If a driver is operating on a 14-day cycle, how many consecutive hours off-duty must they take to initiate a new cycle?
If the Ministry of Transportation approves it, an Hours-of-Service exemption certificate will give a full exemption that lasts until...
A third or subsequent offence within the same two years results in an impoundment period of...
Inter-axle differential locks are used in which types of vehicles?