The Free Ontario Truck Practice Test is an essential study tool for anyone preparing for a commercial driver’s licence in Ontario, including Class A, D, or AZ licences. It is designed to simulate the real written knowledge test, helping drivers become familiar with the types of questions they will encounter and the proper exam format. The practice test covers critical areas such as rules of the road, including speed limits, following distances, and right-of-way; road signs, including regulatory, warning, and construction signs; daily vehicle inspections to ensure safety; and air brake systems for those with a Z endorsement. By taking these practice tests, drivers can identify their weak areas, improve their knowledge, and gain confidence before the official exam.
Regular practice not only increases the likelihood of passing on the first attempt but also reinforces safe driving habits, making it an invaluable resource for both new and experienced drivers looking to maintain or upgrade their commercial driving skills.
Truck Licence written Practice Test Quiz
Rules of the Road
1. What is the minimum following distance for a large truck on a dry road? A. 1 second B. 2 seconds C. 3 seconds D. 4 seconds ✅ Answer: D — 4 seconds
2. When approaching a railway crossing with no signals, what must a truck driver do? A. Speed up B. Stop only if a train is visible C. Slow down, look, and listen D. Honk continuously ✅ Answer: C — Slow down, look, and listen
3. What is the legal blood alcohol limit for commercial drivers in Ontario? A. 0.08 B. 0.05 C. 0.02 D. 0.00 ✅ Answer: D — 0.00 (zero tolerance)
4. When must you perform a daily vehicle inspection? A. Once a week B. Before driving each day C. Only if the truck feels unsafe D. After long trips only ✅ Answer: B — Before driving each day
5. What should you do if your brakes fail while driving downhill? A. Turn off engine B. Shift to neutral C. Use a runaway lane if available D. Jump out of vehicle ✅ Answer: C — Use a runaway lane
Truck Licence written Practice Test Quiz
🚦 Road Signs
6. What does a triangular orange sign mean? A. Stop B. Slow-moving vehicle C. Yield D. Construction ✅ Answer: B — Slow-moving vehicle
7. What does a flashing green light mean in Ontario? A. Stop immediately B. Advance green (you can turn left first) C. Pedestrian crossing D. Hazard ahead ✅ Answer: B — Advance green
8. What does a diamond-shaped sign indicate? A. Regulatory B. Warning C. Information D. Direction ✅ Answer: B — Warning
Truck Licence written Practice Test Quiz
🚛 Air Brake (Z Endorsement)
9. What is the purpose of an air brake compressor? A. Cool the engine B. Store fuel C. Build air pressure D. Control steering ✅ Answer: C — Build air pressure
10. When should you drain air tanks? A. Once a month B. Only in winter C. Daily D. Never ✅ Answer: C — Daily
Truck Licence written Practice Test Quiz
1. When approaching a sharp curve, what is the safest action for a large truck? A. Brake hard while turning B. Slow down before the curve C. Maintain speed D. Accelerate slightly ✅ Answer: B — Slow down before the curve
2. If your vehicle starts to skid on ice, what should you do? A. Brake immediately B. Turn the steering wheel into the skid C. Steer away from the skid D. Shift into neutral ✅ Answer: B — Turn the steering wheel into the skid
3. You are driving a fully loaded truck. How much longer will it take to stop compared to a car? A. Same distance B. Twice as long C. Three to four times longer D. Half as long ✅ Answer: C — Three to four times longer
Truck Licence written Practice Test Quiz
4. What should a driver do when an emergency vehicle is approaching with lights and siren on? A. Speed up to avoid it B. Pull over to the right and stop C. Stop in the middle of the lane D. Ignore it ✅ Answer: B — Pull over to the right and stop
5. What is the correct lane position for a truck making a right turn? A. Far left lane B. Middle lane C. Far right lane D. Either lane ✅ Answer: C — Far right lane
Road Signs
6. A circular sign with a red border and a white background means: A. Warning B. Regulatory (must obey) C. Construction D. Information ✅ Answer: B — Regulatory
7. What does a pentagon-shaped sign indicate? A. School zone or school crossing B. Stop C. Yield D. Curve ahead ✅ Answer: A — School zone or school crossing
Truck Licence written Practice Test Quiz
8. A yellow diamond-shaped sign with a truck going downhill indicates: A. No trucks allowed B. Steep hill ahead C. Truck stop ahead D. Slippery road ✅ Answer: B — Steep hill ahead
9. What does a white rectangular sign with black letters usually indicate? A. Warning B. Regulatory C. Direction or guidance D. Construction ✅ Answer: B — Regulatory (e.g., speed limit)
10. What does a flashing red traffic light mean? A. Stop completely, then proceed when safe B. Slow down C. Proceed with caution D. Stop only if pedestrians are present ✅ Answer: A — Stop completely, then proceed when safe
Air Brake / Vehicle Systems
11. What is the main purpose of the air brake system? A. Reduce engine noise B. Increase fuel efficiency C. Stop and hold heavy vehicles D. Operate the horn ✅ Answer: C — Stop and hold heavy vehicles
12. When should air tanks be drained? A. Once a week B. Daily, before driving C. Only during winter D. Only when pressure drops ✅ Answer: B — Daily, before driving
Truck Licence written Practice Test Quiz
13. What is brake lag? A. Delay in the brake pedal returning B. Delay between pressing brake and stopping C. Brake pedal vibration D. Air leak in the system ✅ Answer: B — Delay between pressing brake and stopping
14. What should you do if the air pressure warning light comes on while driving? A. Keep driving until you reach your destination B. Stop immediately and check the system C. Ignore it D. Pump the brake pedal continuously ✅ Answer: B — Stop immediately and check the system
15. Why is it dangerous to ride the brakes on a downhill slope? A. Wastes fuel B. Causes brake fade or failure C. Tires wear evenly D. Increases speed ✅ Answer: B — Causes brake fade or failure
Daily Inspection / Safety
16. What is considered a major defect during a pre-trip inspection? A. Dirty mirrors B. Loose wheel lug nuts C. Low windshield washer fluid D. Torn floor mat ✅ Answer: B — Loose wheel lug nuts
17. During inspection, you notice a leaking exhaust. What should you do? A. Drive carefully B. Report it and repair before driving C. Ignore if minor D. Only check on highway ✅ Answer: B — Report it and repair before driving
Truck Licence written Practice Test Quiz
18. What is the first step in a pre-trip inspection? A. Check brakes B. Walk around the vehicle C. Start the engine D. Adjust mirrors ✅ Answer: B — Walk around the vehicle
19. Why is securing cargo important? A. Prevents load shift and accidents B. Makes truck lighter C. Saves fuel D. Reduces tire wear ✅ Answer: A — Prevents load shift and accidents
20. How often should mirrors and lights be checked? A. Weekly B. Before each trip C. Monthly D. Only when dirty ✅ Answer: B — Before each trip
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