ACT Heavy Vehicle Knowledge Test Practice Questions - Heavy Vehicle Knowledge Test (Rigid Combination Road Rules Knowledge Test) Exam

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

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

Correct Answer:

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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