Safe Driving第 37 / 120 题
Which factors determine the safe speed for descending a mountain grade?
a.Only the posted speed limit
b.Total vehicle weight, length and steepness of the grade, road and weather conditions, and the amount of traffic
c.Only the size of the engine
d.Only the type of brakes installed
解析
Safe descent speed depends on how much weight the brakes must control, how long and steep the grade is, and the conditions around you. A posted limit is a maximum for ideal conditions, and neither engine size nor brake type alone determines a safe speed.
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