A commercial driver is preparing to move a combination vehicle from a complete stop on an icy lot onto a public roadway. Arrange the following actions in the correct chronological sequence to safely start movement and assess road traction.
- 1Shift the transmission into a low gear to minimize torque delivered to the drive wheels.
- 2Engage the driveline smoothly with minimal throttle until the drive tires begin to roll without spinning.
- 3Accelerate gradually to establish steady forward rolling momentum.
- 4Perform a gentle low-speed service brake application to test surface stopping capability before entering traffic.
Cevap
The proper sequence begins by selecting a low gear to reduce torque, followed by applying gentle throttle to start rolling without wheel spin, accelerating gradually to build momentum, and concluding with a gentle low-speed brake test to determine surface traction.
When starting a commercial vehicle on ice or packed snow, the driver must first shift into a low gear to control torque output, apply gentle throttle to begin rolling without spinning the wheels, build speed smoothly and gradually, and finally conduct a low-speed brake test in a safe area to determine surface grip before merging into active traffic.
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Anahtar Kavram
Starting vehicle movement and verifying traction on slippery surfaces
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