Tas Heavy Vehicle Test Practice Questions - Tasmania Heavy Vehicle Licence Knowledge Test (Rigid Combination) Exam

What is the primary cause of jack-knife in a combination vehicle under heavy braking?

The prime mover's front wheels locking before the rear wheels The trailer brakes being more effective than the prime mover's brakes, causing the prime mover and trailer to fold against each other Excessive speed when cornering causing the trailer to tip sideways The fifth wheel coupling coming loose during braking

Correct Answer:

The trailer brakes being more effective than the prime mover's brakes, causing the prime mover and trailer to fold against each other

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