Which guide signs have a different shape from the standard rectangular guide sign?
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A.
Guide signs installed inside work zones.
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B.
County road guide signs and freeway route markers. Correct
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C.
Guide signs marking hospital and airport exits.
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D.
Guide signs posted on gravel or unpaved roads.
The answer is "County road guide signs and freeway route markers."
Most guide signs are rectangular, and the manual names county road guide signs and freeway route markers as the exceptions with different shapes. Option C catches drivers who remember that hospitals and airports get their own dedicated destination signs and figure the shape must change to match the priority, but those still follow the general rectangle rule.
The traps in the wrong answers
A. Guide signs installed inside work zones.
Construction and maintenance zones use their own orange signs in a separate section of the manual, not guide signs. Imports the shape and color rules from the construction and maintenance section and applies them to guide signs, when the two categories are handled apart.
C. Guide signs marking hospital and airport exits.
The manual names only county road guide signs and freeway route markers as different in shape, not destination signs for specific facilities. Assumes hospitals and airports rate a distinctive shape because they carry high-priority destinations, when the manual keeps them under the general rectangle rule.
D. Guide signs posted on gravel or unpaved roads.
The manual ties the shape exception to county roads and freeway route markers, not to the road surface. Confuses road surface with signage class, guessing that unpaved roads carry uniquely shaped guide signs when the exception is about the road's classification instead.
This question tests your knowledge of Guide Signs in Illinois. Source: Illinois Rules of the Road, "Guide Signs," p.74..
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