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Difficulty: EasyAccelerating Methods

A commercial motor vehicle driver is stopped on an uphill grade with a manual transmission and must accelerate into traffic safely without rolling backward. What is the correct sequence of steps the driver should take to put the vehicle in motion?

  1. 1Apply the parking brake to secure the vehicle and prevent rollback while stationary on the incline.
  2. 2Depress the clutch pedal fully and shift the transmission into a low forward starting gear.
  3. 3Apply light engine throttle and release the clutch pedal until it reaches the friction point where the engine begins to take the load.
  4. 4Release the parking brake smoothly as the engine takes the load, then accelerate gradually while finishing clutch engagement.

Answer

Apply the parking brake to secure the vehicle, shift into low gear with the clutch depressed, ease the clutch to the friction point with light throttle to take the load, and then release the parking brake while accelerating forward.
The correct procedural order ensures the vehicle is fully secured first, placed in a proper low gear, brought to the clutch friction point under light throttle so the engine holds the load, and finally released from the parking brake as forward motion begins smoothly without rollback.

Step-by-Step Solution

1
Secure the commercial motor vehicle against rollback on the grade by setting the parking brake.
The vehicle remains stationary on the hill without relying solely on foot pressure.
Preventing rollback is critical for avoiding collisions with vehicles or hazards stopped closely behind.
2
Depress the clutch pedal and place the transmission into the lowest suitable forward starting gear.
The drivetrain is primed in low gear to supply adequate mechanical advantage.
Starting in a low gear minimizes strain on the clutch and engine when moving heavy weight against gravity.
3
Feed slight engine throttle while letting the clutch pedal up to its friction point.
Engine power begins transferring to the drive wheels.
Pre-loading the drivetrain prevents the vehicle from dropping backward when holding brakes are released.
4
Disengage the parking brake as engine torque takes the load, then accelerate smoothly into traffic.
The vehicle moves forward smoothly without jerking or rolling backward.
Synchronizing brake release with engine power delivery ensures steady power transfer and protects drivetrain components.

Key Concept

Proper mechanical sequence for starting and accelerating on an upgrade without rolling back or damaging the driveline.
Estimated Time:45s
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Accelerating Methods

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