While transporting cargo on a rain-slicked secondary highway, a commercial driver approaches a sharp curve that transitions into a downgrade. To maintain vehicle control and prevent a drive-wheel skid or rollover, which speed management procedure should the driver execute?
- AMaintain normal road speed on approach and apply firm, continuous service brake pressure once all tires have entered the curve.
- Reduce road speed to a safe level before entering the curve, select the appropriate low gear, and avoid hard braking while turning.Cevap
- CEngage the auxiliary retarder at its maximum setting while steering through the wet curve to control speed without heating the foundation brakes.
- DEstimate total stopping distance by factoring only vehicle braking capability, delaying any deceleration until reaching the midpoint apex of the curve.
Cevap
Reduce road speed to a safe level before entering the curve, select the appropriate low gear, and avoid hard braking while turning.
Commercial motor vehicles have a higher center of gravity and require substantial lateral grip to navigate turns safely. On wet pavement, tire traction is greatly reduced. The standard and safe CDL procedure requires the driver to slow down to a safe speed—often significantly below the posted advisory speed—and engage the correct lower gear before entering the curve. This ensures that tire traction is fully available for steering rather than being divided between cornering and braking forces.
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Anahtar Kavram
Pre-curve speed reduction and traction management on adverse roadway surfaces
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