North Carolina Class C Knowledge Test Practice
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Passing target: 80% (24/30)
After a heavy snowfall, you start your parked car to warm it up while you sit inside. Snow is piled high around the back of the car. What is the main danger?
A blue car is parked after heavy snow, with a deep pile around its rear bumper and rear wheel. A card states that the driver is sitting inside with the engine running; no exhaust hazard is identified in the question image.
Correct answer: Snow can block the exhaust pipe and force carbon monoxide gas into the passenger area.
Why
Carbon monoxide has no color, smell or taste, and even small amounts can make you sleepy or unconscious. A leak in the exhaust system can cause the same danger while you drive, so have the exhaust checked often. The handbook suggests keeping a window open about one inch while you travel.
Verified against North Carolina Driver Handbook · Weather Risk · p. 48, 69
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