['Size and Weight Limits']
['Sizes and weights']
07/18/2024
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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 | All Highways |
| Bus | ||
| Articulated bus | ||
| Straight Trucks | 45' | 45' |
| Straight truck and trailer | 65' | 65' |
| Tractor-semitrailer combinations | No limit With 53' semitrailer | No limit With 48' semitrailer |
| Semitrailer | 53' see KPRA | 48' |
| Tractor-twin-trailer combination | No limit With 28' semitrailers | NS |
| Trailers of twin-trailer combinations | 28' | NS |
| Boat-transporter combination | ||
| Overhang limitations | ||
| Stinger-steered boat-transporter | ||
| Overhang limitations | ||
| Auto-transporter | 65' conventional fifth wheel | 65' conventional fifth wheel |
| Overhang limitations | 4' rear, 3' front extendable ramps used to achieve overhangs are excluded from overall length and must be retracted when not in use | 4' rear, 3' front extendable ramps used to achieve overhangs are excluded from overall length and must be retracted when not in use |
| Stinger-steered auto-transporter | 75' | 75' |
| Overhang limitations | ||
| Saddlemount | ||
| General overhang limitations | ||
| Drawbar | 20' total allowed distance between vehicles | NS |
| Dromedary | ||
| Kingpin to rearaxle | 43' to rearmost axle with wheels in contact with the road surface | NS |
| Length special limitations or restrictions | ||
| Weight: | Interstate and Defense Highways | All Highways |
| Steer axle | ||
| Single axle | 18,000 If axles are less than 6' apart, 22,400 if axles spaced 6' or greater | 18,000 If axles are less than 6' apart, 22,400 if axles spaced 6' or greater |
| Tandem axle | ||
| Tridem axle | ||
| Gross vehicle weight | 80,000 | 80,000 |
| Load per inch width of tire | 600 Per inch of width | 600 Per inch of width |
| Per wheel | ||
| Tolerances | ||
| APU allowance | 550 | 550 |
| Natural gas allowance | ||
| 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:
up to a maximum of 80,000 pounds, where W equals the overall gross weight on any group of two or more consecutive axles to the nearest 500 lb, L is the distance in feet between the extremes of any group of two or more consecutive axles, and N equals the number of axles in the group under consideration.
Where a combination of vehicles is used, a vehicle must not carry a gross weight of less than 10% of the overall gross weight of the combination.
State Highways
Formula: the maximum weight of any combination of vehicles (tractor-trailer) may not exceed that which is determined by the formula:
W = 1000 (L + 40)
where W is the gross weight in pounds and L is the length in feet between the centers of the first and last axles of such vehicle or combination of vehicles; gross weight must not exceed 85,000 pounds.
Where a combination of vehicles is used, a vehicle must not carry a gross weight of less than 10% of the overall gross weight of the combination.
All partial numbers arrived at during computations were rounded to the next higher whole number prior to proceeding to the next step of the equation.
['Size and Weight Limits']
['Sizes and weights']