Practice question

What is 'jack-knifing' in relation to articulated or combination heavy vehicles?

  1. Coupling the trailer incorrectly before departure
  2. An uncontrolled fold at the coupling where the trailer swings to the side relative to the prime mover, typically during hard braking
  3. Using the hand brake instead of the foot brake
  4. A deliberate turning manoeuvre to reduce speed on a bend

Answer: B — An uncontrolled fold at the coupling where the trailer swings to the side relative to the prime mover, typically during hard braking

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