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Difficulty: MediumRetarders Usage and Cautions

Because retarders apply auxiliary braking power only to the drive axles, keeping the retarder engaged while driving on wet, icy, or snow-covered roads increases the danger of a drive-wheel skid.

Answer: Answer

Answer

True
Retarders apply retarding force exclusively to the drive wheels. When operating on wet, icy, or snow-covered pavement where road adhesion is compromised, this supplemental force can overcome tire grip, initiating a severe drive-wheel skid or jackknife. Therefore, the statement is true.

Step-by-Step Solution

1
Analyze how vehicle retarders distribute braking force across the vehicle axles.
Retarders apply supplemental braking force exclusively to the drive wheels rather than distributing it evenly across all axles.
Understanding the mechanical application point of retarder braking is essential for evaluating vehicle stability.
2
Evaluate the effect of concentrated drive-wheel braking on surfaces with reduced traction.
On wet, icy, or snow-covered pavement, applying retarding force solely to the drive wheels easily overcomes available tire traction.
Slick road conditions significantly reduce tire adhesion, making drive wheels prone to locking or breaking traction under retarder drag.
3
Determine whether the statement accurately reflects CDL vehicle control safety rules.
The statement correctly links drive-axle retarder force with increased skid risk on slippery roads, confirming that the statement is True.
CDL regulations mandate disabling retarders in adverse weather conditions to prevent drive-wheel skids and maintain directional control.

Key Concept

Retarder Drive-Wheel Braking Mechanics and Low-Traction Skid Hazards
Estimated Time:45s
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Topics

Retarders Usage and Cautions

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