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Illinois Class D Written Exam Practice
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Traffic Signals & Road MarkingsStandalone practice
Double solid white lines separate your lane from another lane moving in the same direction. May you cross them to overtake a slower car?
Blue A travels east in a same-direction lane beside two solid white lines. A broken-white opening lies farther ahead.
Correct answer: You may not; crossing them is prohibited.
Why
Double solid white lines prohibit crossing between the lanes. Stay in your lane until a lawful opening or different marking permits the movement, and then check and signal. These markings separate traffic moving in the same direction.
Verified against Illinois Rules of the Road, July2026 · Double solid white lane lines · p. 82
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