Iowa Class C Knowledge Test Practice
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Passing target: 20/25 correct (TLA practice target)
A single solid white lane line separates two lanes traveling in the same direction. What does this lane 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: It discourages crossing; any lane change must still be safe and lawful.
Why
A single solid white lane line discourages crossing between same-direction lanes. Stay in your lane unless a safe, lawful lane change is needed. A double solid white lane line is different: crossing it is prohibited. These meanings concern lane lines, not every white road-edge marking.
Verified against Iowa Driver's License Manual · Pavement Markings · p. 15
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