A commercial combination vehicle encounters a drive-wheel braking skid on a wet roadway, causing the rear of the tractor to swing out to the right. In what sequential order should the driver execute the standard recovery procedures to regain directional control and prevent a secondary skid or jackknife?
- 1Immediately release the service brakes and disengage driveline drag to allow the locked drive wheels to roll freely and regain friction grip.
- 2Turn the steering wheel rapidly to the right in the direction the rear of the vehicle is skidding.
- 3Counter-steer smoothly back to the left as the tractor begins to straighten and return to its intended path.
- 4Center the steering wheel and maintain a steady course once the tractor and trailer are fully aligned and tracking straight.
Cevap
Release service brakes to allow rolling traction, turn steering wheel right into the direction of the skid, counter-steer left as the vehicle straightens to prevent overshooting, and center the steering wheel once fully aligned.
The correct sequence begins with immediately stopping braking because rolling tires are necessary to generate the cornering friction required for control. The driver must then turn in the direction of the skid (to the right) to align the vehicle. As the vehicle swings back toward its path, prompt counter-steering in the opposite direction (to the left) is critical to prevent the vehicle from overshooting into a secondary skid, followed by centering the steering once alignment is restored.
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Anahtar Kavram
Drive-wheel skid recovery mechanics, rolling traction restoration, and secondary counter-steering control
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