Blue roadside signs tell drivers about:
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A.
Services along the roadway Correct
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B.
Speed limits in urban districts
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C.
Nearby school zone crossings
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D.
Construction and detour routes
The answer is "Services along the roadway"
Blue guide signs point drivers to services along the roadway, such as food, gas, and lodging. Readers who recall the color list mentions school zones and pedestrian crossings, and reach for a nearby color, pick C; those belong to yellow-green earlier in the same section.
The traps in the wrong answers
B. Speed limits in urban districts
Speed limit signs are black and white regulatory rectangles. This answer borrows the blue used on service guide signs for a rule the manual prints on a black-and-white regulatory rectangle.
C. Nearby school zone crossings
School zone and school crossing signs are yellow or yellow-green pentagons, not blue. This answer recalls that school zones appear in the manual's color list and reaches for a nearby color, missing that school zones and pedestrian crossings belong under yellow-green earlier in the same section.
D. Construction and detour routes
Construction and maintenance zone signs are orange. This answer mistakes a lone blue detour arrow spotted on an interstate for the color the manual assigns to construction and maintenance zones.
This question tests your knowledge of Road Signs in Illinois. Source: Illinois Rules of the Road, "Colors of Signs," p.65..
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