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Illinois Class D Written Exam Practice
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Regulatory, Lane & Parking SignsStandalone practice
A white rectangular sign reads SPEED LIMIT 45. What does 45 mean?
Correct answer: The maximum lawful speed under good conditions.
Why
A posted limit states the legal maximum for the zone, while unsafe conditions can require a lower speed.
Verified against Illinois Rules of the Road, July2026 · Posted speed-limit sign · p. 69
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