['Size and Weight Limits']
['Sizes and weights']
11/21/2024
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| Dimension | National Network | State and Other Supplemental Highways |
| Width: | 8' 6" | 8' 6" |
| Height: | 14' 6" Unless otherwise restricted | 14' 6" Unless otherwise restricted |
| Length: | National Network | State and Other Supplemental Highways |
| Bus | ||
| Articulated bus | ||
| Straight Trucks | 45' | 45' |
| Straight truck and trailer | 70' | 70' |
| Tractor-semitrailer combinations | No limit if trailer is 57' 4" or less | No limit if trailer is 57' 4" or less |
| Semitrailer | 57' 4" | 57' 4" |
| Tractor-twin-trailer combination | No limit if trailers are 28' 6" or less | No limit if trailers are 28' 6" or less |
| Trailers of twin-trailer combinations | 28' 6" | 28' 6" |
| Boat-transporter combination | ||
| Overhang limitations | ||
| Stinger-steered boat-transporter | 80' | 80' |
| Overhang limitations | 4' front, 6' rear | 4' front, 6' rear |
| Auto-transporter | ||
| Overhang limitations | ||
| Stinger-steered auto-transporter | 80' | 80' |
| Overhang limitations | 4' front, 6' rear | 4' front, 6' rear |
| Saddlemount | 97' | 97' up to 4 |
| General overhang limitations | 4' front, 10' rear | 4' front, 10' rear |
| Drawbar | 15' | 15' |
| Dromedary | ||
| Kingpin to rearaxle | ||
| Length special limitations or restrictions | ||
| Weight: | Interstate and Defense Highways | State and Other Supplemental Highways |
| Steer axle | 18,000 Due to limit of single pneumatic tire wheels | 18,000 Due to limit of single pneumatic tire wheels |
| Single axle | 20,000 | 20,000 21,000 lb if the vehicle or combination is a digger derrick or bucket boom truck operated by an electric utility. |
| Tandem axle | 36,000 | 40,000 |
| Tridem axle | ||
| Gross vehicle weight | 80,000 | 85,000 |
| Load per inch width of tire | ||
| Per wheel | 9,000 On single pneumatic tires | 9,000 On single pneumatic tires |
| Tolerances | ||
| APU allowance | 550 | 550 |
| Natural gas allowance | 2,000 Includes other alternative fuel vehicles | 2,000 Includes other alternative fuel vehicles |
| Weight special limitations or restrictions | ||
Bridge rules — Interstate Highways
GROSS WEIGHT FORMULA: The maximum weight of any vehicle or combination of vehicles may not exceed that which is determined by the formula:
['Size and Weight Limits']
['Sizes and weights']