A loaded truck at 65 mph on a clear, dry roadway needs at least how much distance to come to a complete stop?
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A.
800 feet
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B.
200 feet
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C.
600 feet Correct
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D.
400 feet
The answer is "600 feet"
The manual gives 600 feet as the minimum stopping distance for a loaded truck at 65 mph on a clear, dry roadway, compared with 400 feet for a passenger vehicle. Anyone landing on D is grabbing the passenger-vehicle number printed in the same sentence, assuming air brakes let a fully loaded truck stop in about a car's distance.
The traps in the wrong answers
A. 800 feet
This overshoots the number the manual publishes for a loaded truck at 65 mph on a clear, dry roadway. This answer rounds the truck figure upward on the rule of thumb that a bigger vehicle must need dramatically more room than the manual actually publishes.
B. 200 feet
This is far short of the truck figure and even shorter than the passenger-vehicle number the manual cites for comparison. This answer applies a rough neighborhood-speed stopping distance for a passenger car to a loaded truck at highway speed.
D. 400 feet
400 feet is the passenger-car figure the manual cites for comparison, not the truck figure. This answer grabs the passenger-vehicle number printed in the same manual sentence, assuming air brakes let a loaded truck stop in about a car's distance.
This question tests your knowledge of Defensive Driving in Pennsylvania. Source: Pennsylvania Driver Manual, "Sharing the Road with Trucks and Buses - Braking," p.58..
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