Unless otherwise posted, what is the default speed limit on an Illinois highway with four lanes?
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A.
65 mph Correct
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B.
70 mph
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C.
55 mph
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D.
60 mph
The answer is "65 mph"
Unless otherwise posted, an Illinois highway with four lanes defaults to 65 mph. Option C is the trap: 55 mph sits on the very next line as the figure for other highways and rural areas, and drivers who lean on the rule of thumb that any non-interstate road caps at 55 mph reach for it.
The traps in the wrong answers
B. 70 mph
70 mph is the interstate and tollway figure, not the general four-lane figure. This answer treats any multi-lane divided road as an interstate and grabs the 70 mph figure from the row directly above the four-lane row.
C. 55 mph
55 mph is the default for other highways and rural areas, not for highways with four lanes. This answer falls back on the rule of thumb that any non-interstate road caps at 55 mph, missing the separate four-lane row that lifts it.
D. 60 mph
60 mph is not a listed Illinois speed limit; the four-lane default is 65 mph. This answer splits the difference between the 55 mph rural figure and the 70 mph interstate figure instead of reading the four-lane row.
This question tests your knowledge of Speed Limits in Illinois. Source: Illinois Rules of the Road, "Speed Limits," p.24..
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