Legal Vehicle Dimensions and Weight Tables

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).

Other Resources

ORS Chapter 818 – Vehicle Limits

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.

Weight Tables Explained

Oregon uses weight tables to determine legal and permittable weights. Motor carriers can also use our Online Weight Calculator.

Weight Table 1 — Legal Weight, No Permit Required

Use for trucks with legal axle weights hauling divisible loads.

Maximum Weight Allowed	Common Vehicle Types
600 pounds per inch of tire width. 20,000 pounds single axle. 34,000 pounds tandem. 80,000 pounds gross weight.	Solo truck. Truck-tractor and semitrailer. Truck and trailer. Log truck and pole trailer.

Weight Table 2 — Extended Weight, Permit Required

Use for trucks with legal axle weights hauling divisible loads.

Maximum Weight Allowed	Common Vehicle Types
Between 80,000 pounds and 105,500 pounds.	Truck-tractor-semitrailer-trailer (aka doubles). Triple-trailer combinations. Truck-tractor. Tri-axle semitrailers.

Weight Table 3 — Heavy Haul Weight, Permit Required

Use for trucks with heavy haul / non-legal axle weights hauling a non-divisible load.

Maximum Weight Allowed	Common Vehicle Types
Single Trip Permit is based on the number of axles and wheelbase. Annual Continuous Operation Permits allows up to 98,000 pounds for non-divisible loads. 600 pounds per inch of tire width. 21,500 pounds per single axle. 43,000 pounds per tandem axle, the weight shown on the over-dimension permit and the sum of the permittable axle, tandem axle, or group axle weight, whichever is less.	Truck-tractor-lowbed semitrailer. Truck-tractor-semitrailer and booster.

Weight Table 4 — Heavy Haul Weight, Permit Required

Use for trucks with heavy haul/non-legal axle weights hauling a non-divisible load. Table 4 allows for more weight using a shorter wheelbase than that authorized by Table 3.

Maximum Weight Allowed	Common Vehicle Types
Based on the number of axles and wheelbase. 600 pounds per inch of tire width. 21,500 pounds per single axle. 43,000 pounds per tandem axle, the weight shown on the over-dimension permit and the sum of the permittable axle, tandem axle, or group axle weight, whichever is less.	Self-propelled crane. Truck-tractor-lowbed semitrailer. Truck-tractor with jeep and semitrailer. Truck-tractor with semitrailer and booster.

Weight Table 5 — Heavy Haul Weight, Permit Required

Use for specific vehicle configurations only. Weight Table 5 and its formulas for increased weights is more complex than the other tables and requires special analysis by the Over-Dimension Permit Unit.

Maximum Weight Allowed	Common Vehicle Types
Up to 48,000 pounds per tandem axle may be allowed if the combination of vehicles has at least 9 axle with a steer axle followed by four consecutive tandem axles which are 8 foot wide (standard). Up to 52,800 pounds may be allowed when the combination has 10 foot wide axles with 4 tires per axle. Up to 60,000 pounds may be allowed when the combination has 10 foot wide axles with 8 tires per axle.	Truck-tractor with jeep, semitrailer and booster.

Specific Analysis and Routing

In special circumstances, ODOT's Bridge Unit may authorize additional weight for moving a large non-reducible load. A single trip permit may be issued for combinations of vehicles having minimum equipment consisting of a steering axle followed by four or more consecutive tandem axles, provided the weight does not exceed:

600 pounds per inch of tire width.
24,000 pounds per single axle.
48,000 pounds per tandem axle.
The weight shown on the permit.
The sum of the permittable axle, tandem axle, or group axle weight, whichever is less.

Overall Vehicle Length and Overhang

See our FAQ web page for the length limitations for car haulers in Oregon. Note: Group Map 1 (form 8100) and Route Map 7 (form 8104) maps are available at any CCD permit office. See Route Maps explanations under Permit Attachments.

Vehicle / Combination Length

Single (Solo) Truck Unit Length

40 feet.

Length of Truck Combinations Including Load

60 Feet.
See exceptions below.

Truck Tractor and Stinger Steered Pole Trailer

65 Feet.

Truck Tractor and Semitrailer Length – Group 1 Highways Only

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

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

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-Truck-Tractor-with-Semitrailer-and-Trailer-Set-Doubles.jpg

Length of Truck Tractor with Semitrailer and Trailer (Set of Doubles) – Designated Routes Only

See Route 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

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.

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.

Types of Over-Dimension Loads

Overheight

Motor carriers moving loads that exceed 14 feet high are required to obtain an over-dimension permit and are subject to special requirements and responsibilities. Note: Overheight may not be caused by items loaded in multiples (stacked or overlapped).

Overheight Movement Requirements

Motor carriers with a single trip over-dimension permit for a load over 14 feet 6 inches high must meet one of two requirements:

Use a pilot car escort with an overheight pole in front of the high load throughout the trip.
Have a signed declaration form on file with CCD acknowledging that the carrier is responsible for any injury to persons, damage to property or damage to any highway or highway structure resulting from an overheight movement under the permit.
o The declaration option is only available to motor carriers that have established accounts with CCD.
o The declaration form must be signed by the individual owner, a partner, a corporate officer, a partner in a LLP, a manager/member of the LLC or agent.
o Declaration Form 735-9929 filed for Attachment 75A — Mobile Homes / Modular Units.
o Declaration Form 735-9930 filed for Attachment 82A — Non-Divisible Loads.

Motor Carrier and Driver Responsibilities

Responsible and liable for any and all injury to persons or damage to property and all damage to or destruction of any highway or any highway structure resulting from the oversize or overweight movement.

Responsible for determining adequate clearance, both vertical and horizontal, for movement under this permit.

Must notify the Over-Dimension Permit Unit within 24 hours of an accident involving striking a structure in the course of a movement.

Overwidth

Motor Carriers moving loads that exceed 8 feet 6 inches in width are required to obtain an over-dimension permit and are subject to special requirements and responsibilities.

Travel restrictions and exceptions are described on Permit Attachment H and apply to all overwidth moves authorized by either an annual or single trip permit that also requires Permit Attachments 70A, 75A or 82A.

Overwidth Permit Attachments

Attachment 70A — Continuous Operation Variance Permit, General Provisions.
Attachment 75A — Mobile Home/Modular Unit Provisions.
Attachment 82A — Non-Divisible Loads.
Special Transportation Permit Attachment H — Specific Hauling Hours and Days for Overwidth Movement.

Oregon Administrative Rules

OAR Division 70 — Vehicle Weight and Dimension Limits.
OAR Division 75 — Movement of Over-Dimension Mobile Homes and Modular Building.
OAR Division 82 — Variance Permits Issued for Non-Divisible Loads.

Overweight

Weight can be a factor in the permitting process depending on the size of the load. Please see Weight Tables Explained to determine your legal and permittable weights.

Load Review

Loads that meet the minimum axle requirements for Permit Weight Table 5 and exceed the allowances on all the weight tables may request that the load be reviewed by a Bridge Engineer.

Requests sent to the bridge engineers may take up to 5 business days.
Not all of the requests are approved.
All requests are route, axle weight and axle spacing specific.
Any changes made to an approved engineer review will have to be re-submitted.