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Difficulty: EasyAccelerating Methods

When starting a manual transmission commercial motor vehicle on an upgrade, using the parking brake is recommended whenever necessary to prevent the vehicle from rolling backward.

Answer: Answer

Answer

True. Applying the parking brake prevents hazardous rollback on an uphill grade until adequate engine power is transferred to propel the vehicle forward.
Commercial driving standards mandate that a vehicle must never roll backward when starting from a stopped position. On an upgrade, using the parking brake keeps the vehicle stationary until the clutch engages and sufficient engine torque is generated to proceed smoothly.

Step-by-Step Solution

1
Identify the primary safety hazard when starting a heavy vehicle on an upgrade.
The vehicle risks rolling backward into vehicles or pedestrians stopped directly behind it.
Commercial motor vehicles are heavy and can rapidly gain backward momentum on steep grades.
2
Determine the proper mechanical control method to prevent rollback.
Engage the parking brake to hold the vehicle stationary while coordinating clutch engagement and throttle application.
This ensures smooth power delivery and eliminates any backward movement before the vehicle pulls forward.

Key Concept

Rollback prevention during uphill acceleration
Estimated Time:45s
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