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Idaho Class D Knowledge Practice Test
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Passing target: 85% (34/40)
Warning, Construction & Information SignsStandalone practice
A yellow warning sign shows a side road joining while both lanes continue. What does it warn you about?
Correct answer: Joining traffic has its own added lane; watch for later lane changes
Why
An added-lane sign means traffic joins in a separate lane rather than immediately merging into yours. Continue in your lane while watching the joining traffic. Drivers who later change lanes must signal and check for a safe opening.
Verified against Idaho Driver’s Handbook, July 2026 · Added traffic lane ahead · p. 50
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