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Question

Difficulty: MediumSpeed and Road Conditions

When driving a commercial motor vehicle on wet, icy, or snow-covered roads, the driver should turn off the engine retarder because the retarding force applied to the drive wheels can cause them to lose traction and initiate a skid.

Answer: Answer

Answer

True
The statement is true. Engine retarders supply retarding torque strictly to the drive wheels. On wet, icy, or snow-packed roads where surface traction is severely reduced, this localized deceleration can cause the drive wheels to lose grip, skidding out and potentially causing a jackknife. Commercial driving regulations require disabling retarders under slippery conditions.

Step-by-Step Solution

1
Identify the roadway condition and the vehicle braking component referenced.
The scenario involves slippery pavement (wet, snow, or ice) and the operation of engine retarders.
Traction availability dictates how powertrain retarding systems affect vehicle stability.
2
Analyze the mechanical operation of engine retarders on drive axles.
Retarders apply continuous braking resistance solely to the drive wheels without distributing force to steer or trailer axles.
When surface friction is low, concentrated deceleration torque on drive wheels exceeds available grip.
3
Determine the mandatory CDL safety protocol for retarder usage in adverse road conditions.
Drivers must switch off retarders whenever road surfaces are wet, snow-covered, or icy.
Disabling retarders prevents sudden drive-wheel spin loss and catastrophic jackknife events.

Key Concept

Retarder safety and traction management on slippery road surfaces
Estimated Time:45s
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Topics

Speed and Road Conditions

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