Ontario Class C Practice Test · Question
What is the primary risk of idling a commercial vehicle for an extended period with the windows closed?
Carbon monoxide is an odorless, colorless gas. Lethal levels can build up if the exhaust system is faulty or if the engine is idled for long periods in enclosed
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Question: What is the primary risk of idling a commercial vehicle for an extended period with the windows closed?
Answer options: ✅ Carbon monoxide poisoning
- Engine overheating
- Turbocharger failure
- Condensation in the fuel lines
Correct answer: Carbon monoxide poisoning
Explanation: Carbon monoxide is an odorless, colorless gas. Lethal levels can build up if the exhaust system is faulty or if the engine is idled for long periods in enclosed or semi-enclosed spaces.
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Question explanations
- What should you do if your accelerator pedal sticks while you are driving?
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- When operating a taxi or small bus, when are you required to ensure passengers are using seatbelts?
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