Maine Axle Weight Limits
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Maximum Legal Weight Allowed
A permit is required when the gross vehicle weight of a single vehicle or a combination of vehicles exceeds the following legal weight limit established for the vehicle type and axle configuration:
| Configuration | Legal Weight Limit |
| 2-Axle Vehicle | 34,000 lbs. |
| 3-Axle Vehicle | 54,000 lbs. |
| 4-Axle Vehicle | 69,000 lbs. |
| 5 or More Axle Vehicle | 69,000 lbs.* |
| 3-Axle Combination of Vehicles | 54,000 lbs. |
| 4-Axle Combination of Vehicles | 69,000 lbs. |
| 5-Axle Combination of Vehicles | 80,000 lbs. |
| 6-Axle Combination of Vehicles | 100,000 lbs.** |
* Except as provided by Title 29-A M.R.S.A. §2364.
**100,000 lbs. is legal on 6 or more axles consisting of a minimum of a 3-axle truck tractor in combination with a tri-axle semitrailer on General Law Highways. The Maine Interstate System is restricted to 80,000 lbs. except that a combination vehicle consisting of a 3-axle truck tractor and a tri-axle semitrailer may operate up to 100,000 lbs. for as long as a federal law exempting Maine from the 80,000 lbs. interstate limit is in effect.
Maximum Permit Weight Allowed
The maximum weights for which a permit may be granted, without a special and detailed review by the Maine Department of Transportation, are as follows:
| Configuration | Legal Weight Limit |
| 2-Axle Vehicle | 39,100 lbs. |
| 3-Axle Vehicle | 62,100 lbs. |
| 4-Axle Truck | 73,000 lbs. |
4-Axle or more Special Mobile Equipment |
110,000 lbs. |
| 4-Axle Truck Tractor-Semitrailer | 120,000 lbs. |
| 5-Axle Truck Tractor-Semitrailer | 130,000 lbs. |
| 6-Axle Truck Tractor-Semitrailer | 140,000 lbs. |
| 7-Axle Truck Tractor-Semitrailer | 159,000 lbs. to 167,000 lbs. ** |
| 8-Axle Truck Tractor-Semitrailer | 177,000 lbs. |
| ** Axle Group Limits | |
| 1st Axle | 12,000 lbs. (20,000 lbs. for 167,000 lbs.) |
| 2nd, 3rd, and 4th Axles | 26,000 lbs. (Combined Weight Max. 72,000 lbs.) |
| 5th, 6th, and 7th Axles | 27,000 lbs. (Combined Weight Max. 75,000 lbs.) |
- There is an additional 3% tolerance on any axle or group of axles.
- Weights in excess of the above are considered extreme loads and may require detailed engineering reviews. An applicant should allow a minimum of two business days for the Maine Department of Transportation to complete a required review. The applicant may be required to supply additional information not on the application (such as an axle weight and spacing diagram).
Source of information: https://www.maine.gov/sos/bmv/commercial/olpermits.html
Source: Oversize.io
