Control & Operation第 81 / 120 题
What happens if you turn too sharply while backing a tractor-trailer?
a.The trailer brakes lock automatically
b.The steering axle lifts off the ground
c.The trailer can jackknife against the tractor and damage both units
d.The fifth wheel unlocks
解析
Excessive angle between tractor and trailer during backing folds the units together and can crush the cab, fenders, or air lines. Trailer brakes do not lock on their own, the steer axle stays down, and the fifth wheel does not unlock from a sharp angle.
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