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Illinois Class D Written Exam Practice
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Observation, Speed & SpaceStandalone practice
The posted limit is 55 mph, but heavy rain makes 55 unsafe. What should a driver do?
Correct answer: Slow to a reasonable and proper speed for the rain.
Why
Illinois requires a reasonable and proper speed, so conditions may demand traveling below the posted maximum.
Verified against Illinois Rules of the Road, July2026 · Speed for actual conditions · p. 27
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