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Zorluk: KolaySpeed and Road Conditions

Commercial vehicle engine retarders should be turned off when driving on wet, icy, or snow-covered roads because they can cause the drive wheels to lose traction and skid.

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True
The statement is true because engine retarders apply mechanical braking torque solely to the drive wheels. When surface traction is compromised by rain, packed snow, or ice, this extra drag breaks tire adhesion and can instantly trigger a drive-wheel skid or jackknife. Therefore, drivers must turn off retarders in wet or icy conditions.

Adım Adım Çözüm

1
Identify the auxiliary braking system and roadway traction conditions.
The statement focuses on using engine retarders on low-traction surfaces (wet, ice, or snow).
Retarders generate braking resistance directly at the drive axle rather than distributing it evenly across all vehicle axles.
2
Evaluate the risk of retarder engagement on low-friction road surfaces.
Retarder drag on slick surfaces causes drive tires to break adhesion, provoking drive-wheel skids.
Commercial driver regulations explicitly direct drivers to disable or switch off retarders when roads are wet, icy, or covered with snow.

Anahtar Kavram

Disabling engine retarders on wet, icy, and snow-covered roadways to prevent drive-wheel skids.
Tahmini Süre:45s
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Speed and Road Conditions

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