Impaired Driving & Penalties — Ontario
Ontario commercial knowledge test practice: 242 free practice questions (Based on the official driver handbook). The official format is not yet verified; check the official site before your test. Impaired Driving & Penalties: 3 questions.
Blood alcohol limits, drugs and fatigue, licence suspensions, demerit points and fines.
This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines.
| Topic / Metric | Value |
|---|---|
| Topic | Impaired Driving & Penalties |
| License test | Ontario Commercial knowledge tests (Class A–F, Z air brake) |
| Topic questions | 3 (1% of 242 total) |
| Review status | This topic page is still being reviewed against the official handbook. Until review is finished it is hidden from search engines. |
Official handbook
Not yet verified
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Questions (3)
1. Which of the following can impair braking effectiveness?
- Excessive moisture in the tanks
- Improperly set slack adjusters
- Overheated brake drums
- All of the above ✓
Answer: D. All of the above
2. What does an alcohol evaporator do?
- It lessens the chance that the air brake valves will freeze. ✓
- It removes alcohol from the air tanks.
- It acts like a supercharger.
- It eliminates the need to drain the air tanks.
Answer: A. It lessens the chance that the air brake valves will freeze.
An alcohol evaporator lessens the chance that the air brake valves will freeze. The handbook says moisture in an air brake system can freeze in cold weather and cause brake failure, and that even tiny ice particles cause problems. The evaporator adds alcohol vapour to the air, which mixes with any moisture or ice and makes it less likely to freeze. That is why it protects the brake valves from icing rather than doing anything to boost engine power.
3. If you feel drowsy, sleepy or fatigued, what should you do?
- Call your dispatcher.
- Call your supervisor.
- Get some sleep. ✓
- Drink coffee and keep driving.
Answer: C. Get some sleep.
You should get some sleep when you feel drowsy, sleepy, or fatigued. The truck handbook says stimulants are never a substitute for sleep. Caffeine can make you feel more alert, but if you are sleep deprived its effects wear off quickly, and the same is true of turning up the radio or opening a window. You cannot trick your body into staying awake; you need to sleep. It suggests using a well-lit rest stop or truck stop, locking your doors, rolling up your windows and taking a nap.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook