2025 ON Commercial General Knowledge Test: 50 Essential Questions

Want to drive a commercial truck in Ontario? You need a specific licence. Get the edge you need with this practice test containing 50 questions. It’s based on the 2025 ON commercial driver's license manual and gives you instant feedback for every answer. The official written test requires an 80% pass rate. So, aim high on this practice test. All questions offer detailed explanations to bolster your knowledge. Whether you're a first-time applicant, renewing your licence, or adding endorsements, this test has you covered. Perfect your skills, understand the rules, and join the ranks of commercial drivers in Ontario. Good luck and drive safely!

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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.

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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.
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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.
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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 of the following statements is false? A driver is not obliged to keep a daily log if the driver...
After a minimum of eight hours off-duty, a driver is not permitted to drive more than how many hours?
Why should you shift to a lower gear when travelling down long, steep hills?
When halting at railway crossings, how close should you stop to the nearest rail or gate?
When executing an alley dock, backing from which side is advisable?
In the stopping procedure at railway crossings, which lights are not activated by school buses?
Which type of vehicles must stop at railway crossings that are not protected by gates, signal lights, or a stop sign?
Under full emergency braking, approximately how far would it take for a train to come to a complete stop?
Before backing your vehicle, you should NOT
To avoid halting in the middle of railway tracks, what action should be taken?
When receiving help from a guide for backing up, where should they position themselves?
At pedestrian crossovers, when are drivers allowed to proceed?
While driving around a curve to the right, why should the front wheels be kept close to the left side of the lane?
What leads to a greater off-tracking?
What action should you take if you're unable to keep up with the pace of traffic?
What is the penalty for drivers who do not obey the rules at a school crossing?
What is the maximum speed-limiting system setting for commercial motor vehicles?
Which statement about legal stopping positions is not true?
Under what conditions must you stop if you're on a road with a median strip and you're approaching a school bus with flashing upper lights?
How long must you stop for a school bus with flashing upper lights?
Which of the following reasons is FALSE: Never use your left-turn signal to indicate to motorists behind you that it’s safe to pass because
What is the condition for proceeding when a school-crossing guard displays a stop sign?
Which of the following should not be done before crossing railway tracks?
How many demerit points can be received by not stopping for a stopped school bus?
Speed limiters apply to vehicles made in 1995 or newer with a manufacturer's gross vehicle weight rating (MGVWR) of what amount?
Why should you keep the front wheels close to the right edge of the pavement when negotiating a left curve?
Which of the following does not belong in the process of backing up straight?
Why is using a guide recommended when backing up?
What does the term 'off-track' refer to in driving context?
What is the mandatory distance you must stop behind a school bus with upper flashing lights?
You're driving a tractor-trailer. How would you negotiate a right turn on a narrow street without the rear wheels overrunning the curb?
What is the minimum following distance that commercial vehicles must maintain when driving at speeds over 60 km/h?
While being overtaken in a large commercial vehicle, how can you assist a smaller vehicle to pass safely?
Does the Anti-lock Braking System (ABS) help your vehicle come to a stop faster?
Is it permissible to go into or cross a bicycle lane for making a right turn at an intersection or driveway?
Which of these is NOT usually a municipal bus bay that you might pass?
When encountering oncoming vehicles with high-intensity headlights at night, how should you adjust your sight to minimize the glare?
What does it mean to "over-drive" your headlights?
Which of these statements is incorrect? Besides road conditions, which of these can also cause a skid?
How should you treat individuals using mobility devices (e.g., motorized wheelchairs and medical scooters)?
You should switch to your low-beam headlights when you are within what distance from a vehicle you're following?
Which of the following is not a safety tip for driving in snowy conditions?
If a bus in a bus bay begins flashing its left-turn signals, indicating that it wants to merge back into traffic, and you are approaching in the lane adjacent to the bus bay, what should you do?
Which of the following isn't a sign that your fatigue level is high enough to put you at risk on the road?
Are larger vehicles permitted to drive on the central apron of roundabouts, the raised portion of pavement next to the central island?
What is hydroplaning?
With what type of vehicle is threshold braking typically used?
Why should you avoid honking excessively while overtaking a cyclist?
Which of these statements is incorrect? Black ice will generally form...
What's the risk involved in driving into a large puddle?