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Difficulty: MediumLarge Commercial Trucks and No-Zones

When stopping behind a large commercial truck on an upgrade, you should leave extra space behind the truck because the vehicle may roll backward slightly when the driver starts moving.

Answer: Answer

Answer

The statement is true. Drivers should maintain extra stopping distance when behind a large commercial truck on an incline because the truck can roll backward slightly when starting.
The statement is correct because commercial trucks carrying heavy loads often roll backward slightly when releasing the brakes on an upward grade. Providing extra space prevents a rear-end crash and keeps your vehicle outside the truck's rear blind spot.

Step-by-Step Solution

1
Analyze the mechanical behavior of heavy commercial vehicles stopped on an upward slope.
When starting on an upgrade, a heavy truck may roll backward a short distance before forward momentum is established.
The vehicle's extreme weight and the time required to engage the drive train on an incline create potential for rollback.
2
Determine safe positioning relative to the truck's rear No-Zone.
Leaving additional space behind the stopped truck protects against rollback impact and ensures sightlines through the truck's side mirrors.
DMV safety standards advise creating an extended buffer behind heavy vehicles stopped on hills.

Key Concept

Rear safety margin and rollback risk when stopped behind commercial trucks on upgrades
Estimated Time:45s
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Topics

Large Commercial Trucks and No-Zones

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