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Idaho Class D Knowledge Practice Test
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Observation, Speed & SpaceStandalone practice
The posted limit is 55 mph, but packed snow makes that speed unsafe. What should you do?
Correct answer: Drive at a lower speed that is reasonable for the conditions
Why
Idaho's basic speed rule requires a reasonable and prudent speed for actual road, weather, visibility, traffic, and hazard conditions, even below the posted maximum.
Verified against Idaho Driver’s Handbook, July 2026 · Speed for current conditions · p. 68
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