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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 white lane-control sign above your lane shows a black left-turn arrow with the word ONLY. What must you do from that lane?
Correct answer: Turn left in the direction shown
Why
An ONLY lane-control sign restricts the lane to the displayed movement, so traffic in that lane must make the indicated left turn.
Verified against Idaho Driver’s Handbook, July 2026 · Left-turn-only lane sign · p. 45
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