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

What is the key purpose of the 'tractor protection system' (tractor protection valve) in a prime mover?

To limit the top speed of the prime mover on steep roads To prevent the prime mover's air supply from depleting if the trailer air line develops a serious leak To lock the turntable so the trailer cannot spin freely To automatically apply the prime mover's service brakes when reversing

Correct Answer:

To prevent the prime mover's air supply from depleting if the trailer air line develops a serious leak

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