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Indiana Operator's Knowledge Exam Practice
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Passing target: 7 correct signs and 18 correct rules
Vehicle Safety, Documents & TowingStandalone practice
Why must you avoid running an engine in an enclosed garage even when you notice no exhaust smell?
Correct answer: Carbon monoxide can build up without a warning smell or color.
Why
Carbon monoxide is colorless and odorless. Do not run a vehicle's engine in an enclosed space or rely on smell to judge safety. Keep the exhaust system maintained and prevent exhaust from entering the passenger compartment.
Verified against Indiana Driver's Manual · Carbon monoxide warning limits · p. 67
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