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Idaho Class D Knowledge Practice Test
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Passing target: 85% (34/40)
Traffic Signals & Road MarkingsStandalone practice
What do double solid white lines between lanes traveling in the same direction mean?
Blue A travels east in a same-direction lane beside two solid white lines. A broken-white opening lies farther ahead.
Correct answer: Lane changes across them are prohibited
Why
Double solid white lines separate same-direction lanes at locations where drivers must remain in their lane.
Verified against Idaho Driver’s Handbook, July 2026 · Double solid white lane lines · p. 59
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