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Illinois Class D Written Exam Practice
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Traffic Signals & Road MarkingsStandalone practice
A single solid white line separates two lanes traveling in the same direction. What does that line mean?
Blue A follows silver B in the right of two eastbound lanes. One solid white line separates the lanes. The opposite carriageway is outside the view.
Correct answer: Crossing it is discouraged and needs special care.
Why
A single solid white line separates lanes moving in the same direction. Crossing is discouraged and requires special care; any lane change must be safe and must obey signs. Do not confuse it with double solid white lines, which must not be crossed.
Verified against Illinois Rules of the Road, July2026 · Single solid white lane line · p. 82
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