Safe Driving第 30 / 120 题
You are traveling at 55 mph on dry pavement in a heavy vehicle. Roughly what total distance will you cover from the moment a hazard appears until you are stopped?
a.About 100 feet
b.About 300 feet, longer than a football field
c.About 60 feet
d.About 1,000 feet
解析
At 55 mph perception is roughly 60 feet, reaction is roughly 60 feet, and braking adds about 170 feet or more, for a total of around 300 feet. One hundred feet or 60 feet would not even cover perception and reaction, and 1,000 feet overstates the distance on dry pavement.
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