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Motor Carrier Definitions

Axle Weight: The weight placed on the road of all of the wheels on the axle

Commercial Motor Vehicle: A motor vehicle or combination of motor vehicles used in commerce to transport passengers or property if the motor vehicle is a:

  • Combination vehicle – has a gross combination weight rating or a gross combination weight of 26,001 or more, whichever is greater, including a towed vehicle with a gross vehicle weight rating or a gross vehicle weight of more than 10,000 pounds, whichever is greater, or
  • Heavy straight vehicle – has a gross vehicle weight rating or gross vehicle weight of 26,001 or more, whichever is greater, or
  • Small vehicle – is designed to transport 16 passengers or more, including the driver, or
  • Small vehicle – a vehicle of any size used to transport hazardous materials requiring placarding

Divisible Load: A load that is reducible by nature or can be readily dismantled

Gross Combination Weight Rating: The greater of…

  • The value displayed on the FMVSS certification label, or
  • The sum of the gross vehicle weight rating or the gross vehicle weights of the power unit and the towed unit, or any combination thereof, whichever is greater. (Exception: The GVWR of the power unit will not be used to define a commercial motor vehicle when the power unit is not towing another vehicle.)

Gross Vehicle Weight Rating: The value specified by the manufacturer as the loaded weight of a single vehicle.

Gross Weight: The total weight placed on the road by a vehicle or combination of vehicles, including the load

Group of Axle Weight: The total weight placed on the road by two or more axles spaced more than 8 feet apart (also known as the inner bridge)

Legal Axle Limit: Maximum allowable weights in Oregon, according to state law, are allowed the lower weight produced by using Table 1, Table 2 or Table 3 Method A or B

Non-divisible Load: A load or vehicle exceeding load/dimensional or weight limits allowed by state law or rules that, if separated into smaller loads, would compromise the intended use, destroy the value or make it unusable for its intended purpose

Sum of Axles: Addition of axle weights allowed by ORS 810.010 Table 1 and/or Table 2

Tandem Axle Weight: The weight placed on the road by all the wheels of two or more consecutive axles space more than 40 inches but no more than 96 inches (8 feet) apart, measured from center of axle

wheelbase: The distance in feet and inches between two or more axles, measured to the nearest foot, with 6 inches being the next larger foot for determining weight


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