When driving a commercial motor vehicle on a wet, snow-covered, or icy roadway, keeping the engine retarder activated provides controlled deceleration and reduces the risk of entering a drive-wheel skid.
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False. Engine retarders must be disabled on slippery surfaces because concentrating braking force on the drive wheels easily breaks tire traction and precipitates a drive-wheel skid.
The statement is false because commercial driving safety guidelines require drivers to turn off retarders whenever driving on wet, snowy, or icy roads. Because retarders direct all deceleration force to the drive wheels without applying braking to other axles, they frequently cause drive tires to lose traction on slick surfaces, inducing a sudden drive-wheel skid or jackknife.
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Disabling auxiliary engine retarders on slippery surfaces to prevent drive-wheel skids
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