Practice question

What is the primary physical cause of a tractor-trailer jackknife?

  1. The trailer's cargo shifting to the rear axle
  2. The tractor's drive wheels locking up and sliding, causing the tractor to spin around the fifth wheel pivot
  3. The front steer tires of the tractor losing air pressure suddenly
  4. The trailer brakes locking up while the tractor continues to steer straight

Answer: B — The tractor's drive wheels locking up and sliding, causing the tractor to spin around the fifth wheel pivot

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Practice more: TESDA Driving NC III Practice Questions - Driving (Articulated Vehicle Heavy Truck) NC III (TESDA Philippines) Exam →