King of the Highway: The Ultimate Big Rig & Semi-Truck Operations Challenge

Which mechanical failure most directly triggers a semi-trailer jackknife?

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Correct!

Incorrect!

A classic tractor-jackknife occurs when the drive axles of the tractor lock up and lose traction, causing the heavy momentum of the trailer to push the rear of the cabin sideways. A trailer-jackknife is caused by trailer brakes locking up.

Which mechanical failure most directly triggers a semi-trailer jackknife?

Drive axle tires lock up and lose traction

The turbo wastegate valves fail to close

Air lines disconnect on high speed turns

The steering axle tires lock up completely

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