What does the manual say about the markings on route marker signs?
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A.
All routes use identical signage.
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B.
Route markings change every 10 miles.
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C.
Different routes have different markings. Correct
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D.
Route markings depend on speed limits.
The answer is "Different routes have different markings."
Different routes have different markings on their route-marker signs. Identical signage tempts drivers who see the Interstate shield most often and assume every route type wears the same design.
The traps in the wrong answers
A. All routes use identical signage.
The manual explicitly notes markings vary by route. This answer assumes the familiar Interstate shield is the one design every route type wears.
B. Route markings change every 10 miles.
Route-marker design is not tied to any distance count. This answer blends the spacing of mileposts with the reason sign designs vary.
D. Route markings depend on speed limits.
Speed limits do not decide route-marker design. This answer blends regulatory speed-sign rules with route-marker appearance.
This question tests your knowledge of Guide Signs in Illinois. Source: Illinois Rules of the Road, "Guide Signs, Route Markers," p.74..
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