A solid white line separates two lanes of traffic moving in the same direction. Crossing that line is:
-
A.
Freely allowed for any lane change.
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B.
Discouraged and requires special care. Correct
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C.
Allowed only to make a right turn.
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D.
Prohibited under any condition.
The answer is "Discouraged and requires special care."
A single solid white line requires special care and is discouraged to cross, but not prohibited. Choice D applies the double-solid-white rule to the single version, treating any solid white line as an absolute barrier.
The traps in the wrong answers
A. Freely allowed for any lane change.
Broken white allows free lane changes; a solid white line still calls for caution. This answer applies the broken-white 'free lane change' rule to the solid version.
C. Allowed only to make a right turn.
No right-turn-only exception applies to solid white; the discouragement is general. This answer ports the double-yellow turn exception over to solid white, where it does not exist.
D. Prohibited under any condition.
The absolute prohibition applies to double solid white; a single line is only discouraged. This answer treats every solid line as an absolute barrier and skips the single-versus-double distinction.
This question tests your knowledge of Road Markings in Illinois. Source: Illinois Rules of the Road, "Chapter 10: Pavement Markings, White Lane Lines," p.79..
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