2025 ON Commercial General Knowledge: 50-Question Test

Want to drive a truck in Ontario? This practice test is updated for 2025 and tailored to help you pass the Ontario commercial driver's licence knowledge exam. It comes packed with 50 multiple-choice questions based on the most recent ON commercial driver's guide. To pass the official test, you need to score at least 80%. Our instant feedback and detailed explanations will help you master each topic, making you a safer and more informed driver. Perfect for first-time commercial licence applicants, renewal applicants, and those adding endorsements.

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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)

At an intersection where there are no signs or lights, you must yield the right-of-way to...
If you have to drive in fog, which of these is not a safe driving tip?
If you have to drive through a flooded area, at what speeds should you test your brakes afterward?
According to studies, when do accidents caused by drowsiness typically occur?
How does the anti-lock braking system (ABS) function?
What is usually the maximum speed of tractors, combines and other farm vehicles?
When navigating country roads at night, when should you switch to low beam headlights?
You should switch to your low-beam headlights when you are within what distance of an oncoming vehicle?
How can you identify a snow removal vehicle from a distance of within 150 metres?
When driving at night on unlit roads, what could potentially deceive you into thinking you can see further than you actually can?
When passing a cyclist, what is the recommended minimum distance you should keep between your vehicle and the cyclist?
If you're parked on the side of the road, what should you do before opening your car door?
If an emergency vehicle approaches while you're in a roundabout, how should you respond?
What is not an action you must take after a minor vehicle collision in which no one was injured?
What does a steady yellow traffic signal indicate?
If your vehicle has broken down, you must move it off the roadway if possible, unless there is a clear view for at least ________ in both directions.
Which action should you not perform to avoid hitting large animals?
Why are animal-crossing signs installed on the road?
Besides flags, what else is required to be displayed on both the front and rear of an oversized vehicle/load?
How are warning signs typically shaped?
What minimum amount of damage must a collision cause to be reportable by law to the police?
Which of these is not an usual temporary condition sign?
What should you avoid doing when you observe an approaching emergency vehicle with its lights or siren on?
What isn't an effective method to maintain the safety of roadside workers near a construction site?
Which of the following isn't a method to reduce your chances of colliding with an animal on a roadway?
If you're at the scene of a crash where someone is injured and you lack first aid training, what should you do?
If you can't move your commercial vehicle off the roadway in a speed limit zone greater than 60 km/h, you must set out one type of emergency warning device at what distance?
Is there any circumstance in which you are permitted to make a left turn on a red light
If you encounter a large animal while driving, you should NOT
As a commercial vehicle operator, do you need to know how to prevent fires and basic firefighting techniques?
If your vehicle is immobilized on the roadway and it's impractical to move it off the roadway, there must be a clear view of it on the roadway from which distance in both directions?
What needs to be used to mark vehicles and/or loads in excess of the dimensions prescribed under Section 109 of the Highway Traffic Act?
What is every driver involved in a collision required to do?
It is illegal to follow a fire truck or an ambulance within
Are commercial drivers permanently exempt from using two-way radios, provided the microphone is securely mounted and easy for the driver to reach?
Which of these vehicles display a flashing green light?
If another driver threatens you, what should you not do?
Which of the following is not recommended to reduce driver distractions?
Which of the following does NOT usually cause a truck fire?
What should you not do if you're experiencing stress while driving?
Except for police, fire and ambulance, what other vehicle is classified as an emergency vehicle when it's stopped with flashing lights?
When the view of your parked vehicle is blocked by a hill, curve, or other obstruction within 150 metres, what should you do?
Should you exchange information with the other driver in a minor accident with minimal damage?
What prompts drivers aged 65 to 79 with class A, B, C, D, E or F licences to undergo a vision, knowledge, and road test?
Which of these are not required to pass your road test successfully?
If a driver is convicted of driving-related offences, demerit points are recorded on their records. How long does this remain on the record from the date of the offence?
How often do drivers under the age of 80 with class A, B, C, E or F licences need to pass a vision and knowledge test in order to renew their licence?
If you receive a notice and a blank medical report form in the mail three months before your medical report is due, which of the follow would you not need to do?
How frequently are Drivers aged 65 or older required to submit a medical report?
What would you need to do if your licence has been suspended, cancelled, or expired for more than three years?