['Size and Weight Limits']
['Sizes and weights']
10/24/2024
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| Dimension | National Network | State and Other Supplemental Highways |
| Width: | 8' 6" | 8' 6" |
| Height: | 13' 6" | 13' 6" |
| Length: | National Network | State and Other Supplemental Highways |
| Bus | 45' | 45' |
| Articulated bus | 60' | 60' |
| Straight Trucks | 40' | 40' |
| Straight truck and trailer | 57' | 57' |
| Tractor-semitrailer combinations | No limit | No limit Except for auto-transporters and livestock haulers |
| Semitrailer | 57' see KPRA | 53' see KPRA |
| Tractor-twin-trailer combination | No limit | No limit |
| Trailers of twin-trailer combinations | 28' 6" | 28' 6" Allowed on all 4-lane U.S. routes and some 2-lane U.S. routes. |
| Auto-transporter | 65' | 65' |
| Overhang limitations | 4' front, 6' rear | 4' front, 6' rear |
| Stinger-steered auto-transporter | 80' | 80' |
| Overhang limitations | 4' front, 6' rear | 4' front, 6' rear |
| Saddlemount | up to 3 | up to 3 |
| General overhang limitations | 5' Total beyond both the front and rear. | 5' Total beyond both the front and rear. |
| Kingpin to rearaxle | 41' To the rearmost axle or a point midway between the two rear axles - only applies to semitrailers greater than 53' 6" | 41' To the rearmost axle or a point midway between the two rear axles - only applies to semitrailers greater than 53' 6" |
| Weight: | Interstate and Defense Highways | State and Other Supplemental Highways |
| Single axle | 20,000 | 20,000 |
| Tandem axle | 34,000 | 36,000 |
| Gross vehicle weight | 80,000 | 80,000 or 84,000 with 6 or more axles |
| Tolerances | NS | 10% |
| APU allowance | 400 | 400 |
| Natural gas allowance | 2,000 |
Bridge rules
Gross Weight Limits – Interstate Highways
For Interstate highway operations, the following formula is used:
['Size and Weight Limits']
['Sizes and weights']