According to the manual, how are highway and expressway guide signs usually posted before an exit?
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A.
One sign posted five miles before the exit
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B.
A single sign posted right at the exit
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C.
Two advance signs, then a third sign at the exit Correct
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D.
Two signs, both placed at the exit ramp
The answer is "Two advance signs, then a third sign at the exit"
The manual describes a three-sign pattern: one advance sign, then another advance sign, then a third sign at the exit itself. Drivers who remember guide signs as a single marker posted right at the ramp pick B, missing that the high-speed pattern uses two earlier advance signs so lane changes can happen in time.
The traps in the wrong answers
A. One sign posted five miles before the exit
The described highway/expressway guide-sign pattern is two advance signs followed by a third sign at the exit; it is not one sign five miles before the exit. This answer invents a five-mile figure, likely confused with distant rural warning signs on two-lane highways.
B. A single sign posted right at the exit
A single sign at the exit is exactly what the three-sign pattern is designed to prevent, since high-speed drivers would often miss it. This answer applies the one-sign-at-the-corner habit from low-speed street driving to a high-speed expressway exit.
D. Two signs, both placed at the exit ramp
Both advance signs are posted well before the exit, not stacked with the third sign at the ramp. This answer assumes exit information matters only at the ramp itself, ignoring the lane changes the advance signs are there to give time for.
This question tests your knowledge of Guide Signs in Pennsylvania. Source: Pennsylvania Driver Manual, "HIGHWAY/EXPRESSWAY GUIDE SIGNS," p.19..
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