You see a solid white line on the right edge of the lane you are driving in. What is its purpose?
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A.
It marks a bicycle lane.
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B.
It separates same-direction traffic into two lanes.
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C.
It marks the boundary of a passing zone.
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D.
It is an edge or fog line that helps you stay on the road. Correct
The answer is "It is an edge or fog line that helps you stay on the road."
A solid white edge line, also called a fog line, marks the right edge of the travel lane and helps you stay on the road, especially in low visibility. Since there is no lane to your right, you cross it only when leaving the road or moving onto the shoulder. Answer B pulls in drivers who carry over the broken white pattern used to divide same-direction lanes and apply it to this solid edge marking instead.
The traps in the wrong answers
A. It marks a bicycle lane.
A bike lane is marked by a wide white line with a bicycle symbol or a bike-lane sign, not by a plain solid white edge line. This answer confuses the solid white edge line with the wide solid white line plus bicycle symbol or bike-lane sign that identifies a bike lane.
B. It separates same-direction traffic into two lanes.
Same-direction lane separation uses a broken white line, not a solid white edge line. This answer confuses the solid white edge line with the broken white line that separates lanes of traffic going in the same direction.
C. It marks the boundary of a passing zone.
Passing zones are governed by yellow centerline markings, not by white edge lines. This answer confuses the white edge line with yellow center-line markings, which are what indicate where passing is and is not allowed.
This question tests your knowledge of Road Markings in Oregon. Source: Oregon Driver Manual, "Pavement Markings," p.23..
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