By how much does the manual say you should reduce your speed on wet roads?
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A.
Reduce it by half
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B.
By 5 to 10 mph Correct
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C.
Slow to a crawl
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D.
By 15 to 20 mph
The answer is "By 5 to 10 mph"
The manual sets a 5 to 10 mph reduction on wet roads and asks you to grow your following distance to 5 or 6 seconds. Overcorrecting with the packed-snow rule (half your speed) or the ice rule (a crawl) are the common misreadings.
The traps in the wrong answers
A. Reduce it by half
Halving your speed is the manual's rule for packed snow, not for wet pavement. This answer confuses the packed-snow rule with the smaller wet-road reduction the manual specifies.
C. Slow to a crawl
Crawling is the manual's rule for ice, not for a plain wet road. This answer applies the deep-danger ice response to any wet road, missing the modest 5 to 10 mph cut the manual sets.
D. By 15 to 20 mph
The manual sets a smaller reduction than this for wet roads. This answer overcorrects with a big-round-number guess instead of the modest 5 to 10 mph the manual sets.
This question tests your knowledge of Speed Limits in Pennsylvania. Source: Pennsylvania Driver Manual, "Snow and Ice," p.41..
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