Impaired Driving & Penalties — British Columbia
British Columbia ICBC commercial knowledge test practice: 252 free practice questions (Based on the official driver handbook). Official test format: Class 1 60/48; Class 2-4 35/28; air brake 25/20. Impaired Driving & Penalties: 5 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 | British Columbia Commercial knowledge tests (Class 1–4, air brake) |
| Topic questions | 5 (2% of 252 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
icbc.com ✓ Verified from official source
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Questions (5)
1. Which of the following can impair braking effectiveness?
- Excessive moisture in the tanks
- Overheated brake drums
- Improperly set slack adjusters
- All of the above ✓
Answer: D. All of the above
2. What does an alcohol evaporator do?
- It eliminates the need to drain the air tanks.
- It lessens the chance that the air brake valves will freeze. ✓
- It acts like a supercharger.
- It removes alcohol from the air tanks.
Answer: B. 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 an alcohol evaporator introduces a small amount of alcohol vapor into the air system. That vapor mixes with moisture in the system, and the alcohol works like anti-freeze by lowering the freezing point of the collected moisture. Because the vapor is carried through the system, it helps keep that moisture from freezing in the air brake parts. It is an optional device, not a substitute for regular draining of the air reservoirs.
3. What should you fill the alcohol reservoir with during the colder months?
- Isopropyl alcohol
- Methyl alcohol (methyl hydrate) ✓
- Ethyl alcohol (ethanol)
- Diesel fuel
Answer: B. Methyl alcohol (methyl hydrate)
During the colder months you should keep the alcohol reservoir filled with methyl alcohol (methyl hydrate). The handbook's air brake section says the alcohol reservoir should be kept topped up with methyl hydrate during the winter months, and that these systems are built to use pure methyl hydrate as the alcohol supply. It also advises starting before the first freeze of the season. Because the reservoir and evaporator or injector are made for that specific product, only methyl hydrate formulated for alcohol evaporators or injectors should go in.
4. Which of the following can impair your driving?
- Using illegal drugs
- Taking prescription medications
- Drinking alcohol
- All of the above ✓
Answer: D. All of the above
All of the above can impair your driving: illegal drugs, prescription medications, and alcohol. The handbook says alcohol, illicit drugs, and even some prescribed drugs can reduce your ability to function safely behind the wheel. It also warns that medications such as antihistamines, sedatives, and some cold remedies can cause drowsiness and decreased alertness, and that certain medication combinations can affect driving. Because each listed item can make you less alert or less able to drive safely, the correct choice is all of them.
5. What is indicated if more than a few droplets of water are noticed when the supply reservoir is drained?
- The alcohol reservoir needs to be topped up
- The weather is extremely humid
- The air dryer or compressor may require servicing ✓
- The supply reservoir is functioning properly
Answer: C. The air dryer or compressor may require servicing
More than a few droplets of water in the drained supply reservoir means the air dryer or compressor may need servicing. The handbook says that if you see more than a few drops of water when you drain the supply reservoir, the air dryer or compressor may need servicing. Air dryers are meant to pull water vapor, oil mist and carbon particles out of the air before it reaches the first reservoir, so water showing up in the reservoir points to a problem with that drying job. The manual goes on to say to check the air dryer's operation by looking for water in the reservoirs during your periodic checks.
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Last checked: 2026-10-17 · Verified from official source
Updated: · Based on the official driver handbook