Skip to main content

Oregon State Flag An official website of the State of Oregon »

Oregon.gov Homepage

Legal Vehicle Dimensions

Vehicle Weight and Size

ORS Chapter 818 – Vehicle Limits

Legal Weight
  • 80,000 pounds gross weight.
  • The axle and group axle weights shown on Weight Table 1 (form 8110).

Legal Size

  • Width — 8 feet 06 inches.
  • Height — 14 feet 00 inches.

Load Length
40 Feet. Load length over 40 feet:
  • Is permitted if the load does not extend beyond the rear of the semitrailer by more than five feet.
  • Cannot extend forward of the rear of the truck cab. 
    • In most cases, up to 5 feet measured from the end of the trailer to the end of the load.
Overall Length for Combination of Vehicles
Overall Length not to exceed the lengths shown on Group Map 1 (form 8100) and Route Map 7 (form 8104).

See below for additional information regarding weight, length and overhang limits.

Over-Dimension Vehicles

Any vehicle that exceeds legal vehicle dimensions and weight, must get an over-dimension permit. Visit our Permittable Vehicle Dimensions and Weight Tables web page for more information.

Tire Size and Weight

Oregon Revised Statutes 818.010(1)(b) maximum allowable weight. For pneumatic tires made of elastic material, tire width is the diameter of the cross section of the tire as customarily measured and rated by the manufacturers of motor vehicles and tires.
Weight is determined by taking the tire size in inches and adding total inches for each tire on an axle and multiplying this total by 600 pounds, not to exceed weights described above.
Examples include a:
  • Single axle with single 10" tires would look like this: 10" x 2 tires = 20" X 600 pounds = 12,000 pounds.
  • Single axle with dual 10" tires would look like this: 10" x 4 tires = 40" x 600 pounds = 24,000 pounds. Although legal weight limits on this example would stop at the maximum allowable weight without a permit as 20,000 pounds.
  • Tandem axle with single 10" tires would look like this: 10" x 4 tires = 40" x 600 pounds = 24,000 pounds.
  • Tandem axle with dual 10" tires would look like this: 10" x 8 tires = 80" x 600 pounds = 48,000 pounds. Although legal weight limits on this example would stop at the maximum allowable weight without a permit as 34,000 pounds.

Metric Conversion Table

Divide the metric number by 25.4 and round up to get the equivalent in inches or refer to the chart below.
Metric Tire Size (centimeters)
Tire Width (rounded to nearest 1/2 inch)
Weight Allowed on 2 Tires (pounds)
235
9 1/2
11,400
245
10
12,000
255
10
12,000
265
10 1/2
12,600
275
11
13,200
285
11 1/2
13,800
295
12
14,400
305
12
14,400
315
12 1/2
15,000
325
13
15,600
335
13 1/2
16,200
345
14
16,800
355
14
16,800
365
14 1/2
17,400
375
15
18,000
385
15 1/2
18,600
395
16
19,200
405
16
19,200
415
16 1/2
19,800
425
17
20,400
435
17 1/2
21,000
445
18
21,600

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.



Overall Vehicle Length and Overhang

Length Limitations for Car Haulers in Orego​​n
To qualify as automobile and boat transporters under 23 CFR 658.13(e)(1)(i)-(ii) and (2), both conventional and stinger-steered vehicles must be capable of carrying cargo on the power unit.
  • See Federal Size Regulations for Commercial Motor Vehicles.
  • Traditional automobile and boat transporters are both defined in OAR 734-073-0051 (11) and (12).​
  • There are no permits available to exceed the length limits allowed in the Federal Size Regulations above.
  • If the carrier operates in Oregon in excess of the length limits above, they are subject to enforcement action.
Traditional Car Haulers — Truck Tractor / Semitrailer Combinations
If the hauling equipment of a traditional car hauler does not exceed 65 feet in length:
  • There is no limit to the semitrailer length on Route Map 7 (form 8104) green, brown, purple and black routes.
  • Legal four foot front overhang and five foot rear extension are allowed for an overall length limit of up to 74 feet.
  • This is a legal combination in Oregon and no permit is required.
If the hauling equipment of a Traditional Car Hauler exceeds 65 feet in length:
  • The semitrailer length is limited to 53 feet including ramps.
  • Legal four foot front overhang and five foot rear extension are allowed.
  • This is a legal combination in Oregon and no permit is required.
  • There is no overall length restriction on Route Map 7 green and brown routes.
  • Refer to Group Map 1 Section 3 (form 8100) for length limits on all other routes.
Stinger-Steered Trailers
Automobile and boat transporter towing stinger-steered semitrailer are both defined in OAR 734-073-0051 (2) and (4).
If the hauling equipment is a car hauler towing a stinger-steered trailer does not exceed 75 feet:
  • Legal four foot front overhang and five foot rear extension is allowed for an overall length limit of up to 84 feet.
  • This is a legal combination in Oregon and no permit is required.
  • There is no limit to the semitrailer length on Route Map 7 green and brown routes.
  • Refer to Group Map 1 Section 4​ (form 8100) for length limits on all other routes.
When do ramps count as part of the length of the combination?
Ramps do not count as part of the length calculation when the overhang of the load, supported by extendable ramps, does not exceed legal overhang limits listed above. This applies to both traditional car haulers and stinger-steered combinations, based on regulations from the Federal Highway Administration.

Note: Group Map 1 (form 8100) and Route Map 7 (form 8104) maps are available at any CCD permit office.  For more information about approved routes, please visit our Oregon Route Maps web page.

Single (Solo) Truck Unit Length
  • ​40 feet.
SingleTruckUnitLength.jpg

Length of Truck Combinations Including Load
  • 60 Feet.
  • See exceptions below.
Truck Tractor and Stinger Steered Pole Trailer
  • 65 Feet.
TruckTractorStingerPoleTrailer.jpg


Truck Tractor and Semitrailer Length – Group 1 Highways Only
TruckTractorSemitrailerLength–Group1.jpg
  • ​60 Feet overall with a maximum 53 foot semitrailer.
Truck Tractor and Semitrailer Length – Designated Routes Only
  • See Route Map 7.
  • Unlimited overall length with a maximum 53 foot semitrailer.
Truck and Trailer Length – Group 1 Highways Only
TruckandTrailerLength–Group1.jpg
  • 75 Feet overall with a maximum 53 foot trailer.
    or
  • 75 Feet overall with a maximum 40 foot truck.
    or
  • 80 Feet overall with a maximum 40 foot trailer IF the trailer’s front axle is steerable by a turntable or converter dolly.
Length of Truck Tractor with Semitrailer and Trailer (Set of Doubles) – Group 1 Highways Only
TruckTractorSemitrailerTrailer-SetofDoubles–Group1.jpg
  • ​75 Feet overall with one trailer being a maximum 40 feet in length.
    or
  • Unlimited overall length with the two trailers measuring a maximum 60 feet from front to rear (including space between the trailers).
Length of Truck Tractor with Semitrailer and Trailer (Set of Doubles) – Designated Routes Only
  • See R​​oute Map 7 (form 8104).
  • Unlimited overall length with the two trailers measuring a maximum 68 feet from front to rear (including space between the trailers).

Load Overhang

In Oregon, wheelbase is measured from the center of the steer axle to the center of the last axle.
Front Overhang
  • 4 Feet 0 inches.
  • Measure from the front bumper of the power unit to the front of the load.
Rear Overhang — Solo Vehicle
  • 3/4 Wheelbase.
  • Measure from the center of the last axle of the vehicle to the end of the load.
Rear Overhang — Combination of Vehicles
  • 1/3 Wheelbase.
  • Measured from the center of the last axle to the end of the load as long as:
    o The load length does not exceed 40 feet.
    o The trailer length does not exceed 40 feet.
    o The overall length (including rear overhang) does not exceed 60 feet.
  • Otherwise, 5 feet is allowed off the back of the trailer, as long as any overall length limits for a given combination and highway are not exceeded.

Load Length
  • 40 Feet.
  • Load length over 40 feet is permitted if the load does not extend beyond the rear of the semitrailer by more than five feet.
  • Loads over 40 feet cannot extend forward of the rear of the truck cab.

Overall Length for Combination of Vehicles
  • Overall Length not to exceed the lengths shown on Group Map 1 (form 8100) and Route Map 7 (form 8104).
  • In most cases, up to 5 feet measured from the end of the trailer to the end of the load.