Vehicle Size and Weight
Legal Size- Width — 8 feet 06 inches.
- Height — 14 feet 00 inches.
| Legal Weight- 80,000 pounds gross weight.
- The axle and group axle weights shown on Weight Table 1 (form 8110).
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Any vehicle that exceeds legal vehicle dimensions and weight, must get an over-dimension permit. Over-Dimension permits can be ordered through
ORION, our web-based self-service permitting system. ORION provides access to both single trip permits and annual permits.
For more information about the new system, training resources and instructions on how to establish your account, please visit the
ORION Project page.
Other Resources
Legal Operating Weight
The legal operating weight of a truck is determined by the:
- Tire size.
- Number of axles.
- Wheelbase of the vehicle or combination of vehicles.
Legal Gross Weight
In Oregon, the maximum legal gross weight is 80,000 pounds.
Single Axle
The gross weight a single axle cannot exceed is limited to the lowest of:
- 600 pounds per inch of tire width on the tires.
- The tire manufacturer’s sidewall rating.
- 20,000 pounds.
Tandem Axle
The gross weight of a tandem axle is limited to the lowest of:
- 600 pounds per inch of total tire width on the tires.
- The tire manufacturer’s sidewall rating.
- 34,000 pounds.
Vehicle or Combination of Vehicles
Gross weight of a vehicle or combination of vehicles is limited to the lowest of:
- 600 pounds per inch of total tire width on the tires.
- The tire manufacturer’s sidewall rating.
- 20,000 pounds on a single axle.
- 34,000 pounds on a tandem axle.
- The group axle weights shown on Weight Table 1 (form 8110).
- 80,000 pounds gross weight.
Exceptions to the Above Weights
Exception 1
Two consecutive sets of tandem axles spaced 30 feet or more apart may have a gross weight of 34,000 pounds each and operate without a permit on all non- Interstate highways.
A permit is required for operations on Interstate highways, unless the spacing is 36 feet or greater.
Exception 2
Four axles consisting of a set of tandem axles and two axles spaced nine feet or more apart may have a gross weight of 70,000 pounds IF the distance between the first and fourth axle is 35 feet or more.
A permit is required for operations on Interstate highways.
Exception 3
An additional 550 pounds is allowed for fully functional idle reduction systems (aka: Alternate Power Unit or APU).
Exception 4
An additional 2000 pounds is allowed for a vehicle that uses natural gas (CNG) or electric battery as its fuel source.
Notes to Exceptions 3 and 4 – A Vehicle:
- Fueled with CNG or Electric battery AND equipped with an APU is allowed an additional 2,550 pounds.
- May not exceed manufacturer tire sidewall rating.
- Requires an extended weight permit if the gross weight exceeds 80,000 pounds.
- May not exceed a maximum of 105,500 pounds with an extended weight permit including exceptions 3, 4, or the combination of both.
- Must include the additional weight in registration and tax declarations.