Under ideal conditions, about how many feet does a vehicle need to stop from 55 mph?
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A.
150 feet
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B.
211 feet Correct
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C.
300 feet
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D.
100 feet
The answer is "211 feet"
Total stopping distance from 55 mph under ideal conditions is about 211 feet, adding reaction distance to braking distance. Drivers who estimate braking distance alone and skip reaction time land near 150 and pick A.
The traps in the wrong answers
A. 150 feet
150 feet under-counts the total, which pairs braking distance with reaction distance for a full 211. This answer estimates only braking distance and skips the reaction time the manual bundles into the 211 figure.
C. 300 feet
300 feet overshoots the manual's figure, which is 211 under ideal conditions. This answer overcorrects by padding the number for safety instead of using the manual's stated figure.
D. 100 feet
100 feet is closer to braking distance from a much lower speed, not total stopping from 55. This answer guesses low by picturing braking distance from residential speeds instead of highway speed.
This question tests your knowledge of Speed Limits in North Carolina. Source: North Carolina Driver Handbook, "Adjusting Your Speed to Driving Conditions," p.53..
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