Unless otherwise posted, what is the default speed limit in an Illinois alley?
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A.
20 mph
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B.
25 mph
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C.
15 mph Correct
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D.
30 mph
The answer is "15 mph"
Alleys carry a 15 mph default in Illinois. A is the trap: 20 mph sits on the very next bullet as the school-zone figure, and a driver scanning the low end of the list reaches for the first small number without checking which bullet names alleys.
The traps in the wrong answers
A. 20 mph
20 mph is the school-zone figure, printed on the very next bullet of the same list. Reaches for the first small number at the bottom of the list and applies the school-zone limit to alleys because both feel like 'slow zones.'
B. 25 mph
The manual does not use 25 mph as an alley default. Carries over the residential-street figure common in other states to a road type the Illinois manual gives its own lower limit.
D. 30 mph
30 mph is the city and town default, not the alley figure. Treats an alley as an ordinary city street and stops reading the list at the city/town bullet instead of scanning down to the alley row.
This question tests your knowledge of Speed Limits in Illinois. Source: Illinois Rules of the Road, "Speed Limits," p.24..
Related Illinois questions
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