What determines the color used on a guide sign?
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A.
The type of information given Correct
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B.
The population of the county where posted
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C.
The posted speed limit on the road
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D.
The time of day the sign is used
The answer is "The type of information given"
The color of a guide sign is determined by the type of information given. Population count trips drivers who assume geographic factors drive signage decisions, because road appearance really does vary across city, suburban, and rural drives.
The traps in the wrong answers
B. The population of the county where posted
Population plays no role in Illinois sign coloring. This answer guesses at a geographic reason after noticing signage varies over a long drive.
C. The posted speed limit on the road
Speed limits do not decide guide-sign colors. This answer borrows the regulatory-sign speed rule and misplaces it on color logic.
D. The time of day the sign is used
The manual does not tie sign color to time of day. This answer confuses reflective coatings on signs with the category the sign belongs to.
This question tests your knowledge of Guide Signs in Illinois. Source: Illinois Rules of the Road, "Guide Signs," p.74..
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