Practice question

What is a 'trailer jackknife' and what causes it?

The tractor's drive wheels lock up or lose traction on a slippery road, causing the heavy trailer to push the tractor sideways into a V-shape
The front tires blowout causing the truck to flip backwards
The landing gear drops down while driving at high speed
The steering wheel locks when turning a corner

Answer: A — The tractor's drive wheels lock up or lose traction on a slippery road, causing the heavy trailer to push the tractor sideways into a V-shape

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