A diamond-shaped sign with a yellow background and a black symbol means:
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A.
A guide to the next available exit.
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B.
A rule that you must follow on the road.
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C.
A construction zone or work area ahead.
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D.
A hazard or change in the road ahead. Correct
The answer is "A hazard or change in the road ahead."
Yellow with black symbols on a diamond is the standard warning category, alerting you to a known possible hazard or a change in road conditions ahead: a curve, a merge, slippery pavement when wet. Construction warnings share the diamond shape but switch to orange, so the color shift is the cue that the warning is temporary. Regulatory signs state the law (black on white rectangles, or the red prohibitive set), and guide information is green. Choice C trips drivers who forget that the shift from yellow to orange is what marks a work zone, and assign the yellow background to construction instead.
The traps in the wrong answers
A. A guide to the next available exit.
Guide and exit information signs are green, not yellow. This answer confuses the yellow warning category with green guide signs that direct drivers to exits and destinations.
B. A rule that you must follow on the road.
A yellow diamond is a warning sign. Regulatory signs come as white rectangles with black words or symbols, and also as the red prohibitive set: Stop, Yield, Do Not Enter, and the turn-prohibition signs. Neither group uses a yellow diamond.
C. A construction zone or work area ahead.
Work zones use orange signs, not yellow. The color shift from yellow to orange marks a temporary work-area warning. This answer misreads the warning category by assigning the yellow background to work zones, which use orange instead.
This question tests your knowledge of Road Signs in Oregon. Source: Oregon Driver Manual, "Warning Signs," p.10..
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