According to the manual, why does an expressway use several advance guide signs before an exit instead of just one?
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A.
State law requires exactly three signs at every exit
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B.
Each sign along the exit lists a different exit number
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C.
High speed and heavy traffic can cause drivers to miss a single sign Correct
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D.
Different sign colors are used for different exits
The answer is "High speed and heavy traffic can cause drivers to miss a single sign"
The manual explains that high speeds and heavy traffic on highways make it easy to miss a single sign. Several signs give drivers repeated chances to see the exit information and to change lanes. B is tempting to a reader who assumes duplicate signs must each carry different information to be justified, missing that the redundancy is the whole point.
The traps in the wrong answers
A. State law requires exactly three signs at every exit
The manual describes a typical pattern, not a legal three-sign requirement. This answer reads a common practice as a hard legal rule.
B. Each sign along the exit lists a different exit number
The repeated signs cover the same exit; they do not each name a different one. This answer assumes duplicate signs must carry different information to be justified.
D. Different sign colors are used for different exits
Highway guide signs are green regardless of which exit they announce. This answer imagines a color-coding scheme the manual does not describe.
This question tests your knowledge of Guide Signs in Pennsylvania. Source: Pennsylvania Driver Manual, "Highway/Expressway Guide Signs," p.19..
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