A commercial driver is conducting a pre-trip inspection and preparing a tractor-trailer for a route through an area with forecasted freezing rain and snow accumulation. According to commercial driving safety standards and winter operating guidelines, which of the following procedures must the driver follow?
- AAccept a minimum tread depth of 2/32 inch on front steering axle tires as long as drive axle tires have at least 4/32 inch of tread.
- Verify front steering tires have at least 4/32-inch tread depth and ensure the auxiliary engine retarder is turned off before driving on slippery surfaces.Cevap
- CEngage the engine retarder at its maximum setting to maintain continuous braking force and prevent wheel lockup on icy roads.
- DCarry two reflective warning triangles instead of the standard three because reduced winter visibility shortens spacing requirements.
Cevap
Verify front steering tires have at least 4/32-inch tread depth and ensure the auxiliary engine retarder is turned off before driving on slippery surfaces.
Safe winter driving requires both compliant pre-trip equipment and proper control configuration. Commercial motor vehicle regulations require steer tires to have at least 4/32 inch of tread depth in every major groove (non-steer tires require 2/32 inch). Additionally, CDL safety rules dictate turning off engine retarders on wet, icy, or snow-covered roads because retarder braking torque on low-traction surfaces can break drive-wheel grip and cause an uncontrollable skid.
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Anahtar Kavram
Winter pre-trip tire tread compliance and auxiliary retarder deactivation on slippery surfaces
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