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Difficulty: MediumAccelerating Methods

When initiating forward movement on an upgrade, allowing a commercial motor vehicle to roll backward slightly before accelerating is acceptable if no traffic is visible in the rear mirrors.

Answer: Answer

Answer

False
The statement is false because commercial vehicle operating procedures strictly forbid allowing a vehicle to roll backward when starting from a stop on an upgrade. Proper accelerating technique requires partly engaging the clutch before releasing the service brake, or utilizing the parking brake, to prevent any backward movement.

Step-by-Step Solution

1
Identify the standard rule governing vehicle movement when starting on an upgrade.
Commercial driving standards mandate that an operator must never allow the vehicle to roll backward when launching from a stop.
Any backward movement creates a high risk of collision due to large blind spots directly behind commercial vehicles.
2
Determine the proper mechanical control technique for grade starts.
The driver must partly engage the clutch before releasing the brake or apply the parking brake until drive torque is established.
Coordinating the clutch and braking mechanism maintains continuous hold on the vehicle until positive forward traction is achieved.
3
Evaluate the validity of the presented statement against standard operating procedures.
The assertion that slight rollback is acceptable based on rear mirror observation contradicts commercial safety regulations.
The prohibition against vehicle rollback is absolute and cannot be relaxed based on mirror checks.

Key Concept

Prevention of Vehicle Rollback During Acceleration
Estimated Time:1m 0s
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Topics

Accelerating Methods

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