Heavy Equipment Operator Certification Exam Prep · Question
What is the primary risk associated with rapidly decelerating a fully loaded articulated dump truck (ADT) on a downhill grade?
Rapid deceleration on a downhill grade, especially with a heavy load pushing from behind, significantly increases the risk of the trailer pushing the prime move
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Question: What is the primary risk associated with rapidly decelerating a fully loaded articulated dump truck (ADT) on a downhill grade?
Answer options:
- Damage to the transmission. ✅ Jackknifing of the trailer and prime mover.
- Overheating of the engine.
- Slipping of the tires causing minor skidding.
Correct answer: Jackknifing of the trailer and prime mover.
Explanation: Rapid deceleration on a downhill grade, especially with a heavy load pushing from behind, significantly increases the risk of the trailer pushing the prime mover sideways, leading to a jackknife. This is particularly dangerous for articulated vehicles. Ontario Reg. 213/91 discusses safe operation of vehicles on grade in Section 102.
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