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Idaho Class D Knowledge Practice Test
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Passing target: 85% (34/40)
Regulatory, Lane & Parking SignsStandalone practice
A black-and-white rectangular sign reads SPEED LIMIT 45. What does the number mean under ideal conditions?
Correct answer: The maximum lawful speed is 45 mph
Why
A posted speed limit states the maximum legal speed under ideal conditions; weather, traffic, or visibility may require a lower speed.
Verified against Idaho Driver’s Handbook, July 2026 · Posted maximum speed · p. 45
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