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Difficulty: MediumWeight Definitions and Limits (GVWR, GCWR, Axle Weights)

A commercial driver operates a three-axle straight truck towing a two-axle pup trailer. The power unit has a manufacturer Gross Vehicle Weight Rating (GVWR) of 46000 lbs46{}000\text{ lbs}, and the full setup has a Gross Combination Weight Rating (GCWR) of 70000 lbs70{}000\text{ lbs}. At an official weigh station, the scale measures the power unit alone at 48500 lbs48{}500\text{ lbs} and the total combined vehicle at 66200 lbs66{}200\text{ lbs}. Based on commercial vehicle weight regulations and manufacturer ratings, which of the following assessments is correct?

  1. A
    The vehicle is operating legally because the Gross Combination Weight Rating (GCWR) supersedes the power unit's Gross Vehicle Weight Rating (GVWR) whenever a trailing unit is connected.
  2. The configuration is overloaded because the power unit exceeds its individual GVWR, even though the total gross combination weight remains below the GCWR.Answer
  3. C
    The vehicle is operating legally as long as the total gross combination weight is below the federal statutory limit of 80000 lbs80{}000\text{ lbs}, regardless of manufacturer ratings.
  4. D
    The configuration is overloaded because the GCWR defines the maximum allowable weight of the power unit alone rather than the total combination.

Answer

The configuration is overloaded because the power unit exceeds its individual GVWR, even though the total gross combination weight remains below the GCWR.
A commercial motor vehicle must comply with both individual unit ratings and combination ratings simultaneously. Although the total measured weight (66200 lbs66{}200\text{ lbs}) is well within the Gross Combination Weight Rating of 70000 lbs70{}000\text{ lbs}, the power unit itself (48500 lbs48{}500\text{ lbs}) exceeds its manufacturer-specified Gross Vehicle Weight Rating of 46000 lbs46{}000\text{ lbs}, making the vehicle overloaded and unsafe.

Step-by-Step Solution

1
Evaluate the individual power unit scale weight against its manufacturer Gross Vehicle Weight Rating (GVWR).
Actual power unit weight is 48500 lbs48{}500\text{ lbs}, which exceeds the specified GVWR of 46000 lbs46{}000\text{ lbs} by 2500 lbs2{}500\text{ lbs}.
GVWR is the maximum allowable total weight for a single vehicle plus its load as specified by the manufacturer; exceeding it overloads the vehicle's frame, brakes, and suspension.
2
Evaluate the total vehicle combination scale weight against the Gross Combination Weight Rating (GCWR) and legal limits.
Total combination scale weight is 66200 lbs66{}200\text{ lbs}, which is within the 70000 lbs70{}000\text{ lbs} GCWR and below the standard 80000 lbs80{}000\text{ lbs} federal interstate gross limit.
GCWR represents the maximum allowable total weight of the power unit, trailing unit, and cargo combined.
3
Synthesize compliance across all applicable weight parameters.
The vehicle is legally and mechanically overloaded because compliance with GCWR does not excuse a violation of an individual unit's GVWR.
Commercial motor vehicles must comply simultaneously with axle ratings, single-unit GVWRs, combination GCWRs, and statutory highway limits.

Key Concept

Distinct application and non-substitutability of Gross Vehicle Weight Rating (GVWR) versus Gross Combination Weight Rating (GCWR)
Estimated Time:1m 15s
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Topics

Weight Definitions and Limits (GVWR, GCWR, Axle Weights)

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