The crack-the-whip effect is related to:
Answer: B
The susceptibility of the last trailer of a combination vehicle to rollover due to magnifying any vehicle movement.
The crack-the-whip effect is related to the tendency of the last (or third) trailer of a combination vehicle to rollover the easiest because steering and braking movements are magnified further back on the vehicle.
All choices
- AThe amount of off-tracking exhibited by the last trailer of a combination vehicle.
- BThe susceptibility of the last trailer of a combination vehicle to rollover due to magnifying any vehicle movement.
- CSkidding that is started in the front trailer being transferred to the rear trailer.
Why the other answers are wrong
A. The amount of off-tracking exhibited by the last trailer of a combination vehicle.
Off-tracking refers to the path of trailer wheels, not the rollover tendency caused by the crack-the-whip effect.
C. Skidding that is started in the front trailer being transferred to the rear trailer.
Skidding transfer is not related to the crack-the-whip effect, which involves rollover risk due to magnified movements.
CDL Combination Vehicles Test Info
Questions on Exam
20
Passing Score
80%
Time Limit
Typically 30 minutes; varies by testing location
The Combination Vehicles test content is federally standardized, so this question applies in every state. Age limits, fees, and testing procedures do vary — check your state's CDL requirements.
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More CDL Combination Vehicles Practice Questions
- Which task is NOT performed during the tractor protection valve test?
- What is the purpose of the trailer air supply control?
- What is the most common cause of a tractor-trailer jackknife?
- There are two things that a driver can do to prevent a rollover. They are: (1) keep the cargo as close to the ground as possible and (2):
- Off-tracking or cheating causes which of these to follow the wider path while making a turn?