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Idaho Class D Knowledge Practice Test
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Passing target: 85% (34/40)
Warning, Construction & Information SignsStandalone practice
What is the general purpose of a yellow diamond-shaped road sign?
Correct answer: Warn of a condition or hazard ahead
Why
A yellow diamond alerts drivers to an approaching condition so they can adjust speed, position, and attention.
Verified against Idaho Driver’s Handbook, July 2026 · Yellow diamond warning · p. 49
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