You are driving on a road covered by packed snow. How does the manual say you should adjust your speed?
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A.
Keep the posted speed
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B.
Reduce by 5 to 10 mph
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C.
Slow to a crawl
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D.
Decrease it by half Correct
The answer is "Decrease it by half"
On packed snow the manual says to cut your speed in half. On ice, slow to a crawl. On plain wet pavement, reduce by 5 to 10 mph. Each surface has its own reduction, and answer C swaps in the ice rule where the packed-snow rule belongs.
The traps in the wrong answers
A. Keep the posted speed
The posted number assumes ideal conditions; packed snow requires a large reduction. This answer treats the posted limit as a fixed ceiling regardless of what the surface is doing.
B. Reduce by 5 to 10 mph
The 5 to 10 mph reduction is the manual's rule for wet roads, not packed snow. This answer confuses the wet-pavement reduction with the deeper cut the manual calls for on packed snow.
C. Slow to a crawl
Slowing to a crawl is the manual's rule for ice, not packed snow. This answer confuses the ice rule with the packed-snow rule that only asks for half your speed.
This question tests your knowledge of Speed Limits in Pennsylvania. Source: Pennsylvania Driver Manual, "Snow and Ice," p.41..
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