While traveling along a highway during active sleet and sub-freezing temperatures, a commercial driver observes ice accumulation beginning on the vehicle's exterior mirrors and wiper arms. Which of the following actions is the safest operational procedure for the driver to perform under these winter conditions?
- AMaintain a standard four-second following distance behind other traffic, relying on the anti-lock braking system to offset slippery pavement.
- Turn off the engine retarder switch to prevent excessive braking torque from initiating a drive-wheel skid on the slick pavement.Cevap
- CEngage the engine compression brake on its highest setting to slow the vehicle continuously without heating the service brake linings.
- DOperate with 2/32-inch tread depth on all steer tires, assuming winter traction depends entirely on drive axle tire condition.
Cevap
Turn off the engine retarder switch to prevent excessive braking torque from initiating a drive-wheel skid on the slick pavement.
Turning off the engine retarder is essential whenever road surfaces are slippery from ice, snow, or freezing rain. Because retarders apply braking force only to the drive axle wheels, their retarding torque can easily break tire adhesion on slick surfaces, causing the drive wheels to skid and potentially provoking an unrecoverable jackknife.
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Deactivating engine retarders during slippery winter driving conditions to prevent drive-wheel skids
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