['Size and Weight Limits']
['Sizes and weights']
07/19/2024
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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 | On All Other |
| Bus | 45' | 45' |
| Articulated bus | ||
| Straight Trucks | 45' | 45' |
| Straight truck and trailer | ||
| Tractor-semitrailer combinations | ||
| Semitrailer | 53' see KPRA | 48' |
| Tractor-twin-trailer combination | N/S | N/S |
| Trailers of twin-trailer combinations | 28' | 28' only on state-designated routes |
| Boat-transporter combination | ||
| Overhang limitations | ||
| Stinger-steered boat-transporter | ||
| Overhang limitations | ||
| Auto-transporter | 65' | 65' |
| Overhang limitations | 3' front, 4' rear | 3' front, 4' rear |
| Stinger-steered auto-transporter | 75' | 75' |
| Overhang limitations | 3' front, 4' rear | 3' front, 4' rear |
| Saddlemount | ||
| General overhang limitations | ||
| Drawbar | ||
| Dromedary | ||
| Kingpin to rearaxle | 41 to the centerline of the rear axle or the midpoint of a tandem axle of the semitrailer. Trailer must also be equipped with a rear underride guard | NS |
| Length special limitations or restrictions | Aerodynamic devices that extend a maximum of 5' beyond the rear of the vehicle, provided such devices have neither the strength, rigidity, nor mass to damage a vehicle, or injure a passenger in a vehicle, that strikes a trailer so equipped from the rear, and provided also that they do not obscure tail lamps, turn signals, marker lamps, identification lamps, or other required safety devices, such as hazardous materials placards or conspicuity markings are exempt from the length limits. | |
| Weight: | Interstate and Defense Highways | On All Other |
| Steer axle | ||
| Single axle | 20,000 With a GVW greater than 73,280 lbs and axle spacing greater than 8’ | 20,000 18,000 lb on axles less than 10' apart, 22,400 lb on axles more than 10' apart |
| Tandem axle | 34,000 36,000 if gross weight is less than 73,280 lb | 34,000 36,000 if gross weight is less than 73,280 lb |
| Tridem axle | ||
| Gross vehicle weight | 80,000 | 80,000 |
| Load per inch width of tire | Manufacturer’s load rating | Manufacturer’s load rating |
| Per wheel | ||
| Tolerances | NS | 5% |
| APU allowance | 550 | 550 |
| Natural gas allowance | ||
| Weight special limitations or restrictions | For a combination of truck-tractor and single semi-trailer with 4 or more axles carrying raw forestry products, the allowed weight on any tandem - 40,000 lbs | |
| On Interstate and Designated Federal-aid Highways | On Other State and Supplemental Highways | |
|---|---|---|
| 3-axle units | 47,500 lb or federal weight formula, whichever is greater | 55,000 lb or federal weight formula, whichever is greater |
| 4-axle units | 47,500 lb or federal weight formula, whichever is greater (any tridem may not contain more than 1 retractable axle) | 60,000 lb or federal weight formula, whichever is greater (any tridem may not contain more than 1 retractable axle) |
| Distance between extreme axles (in ft) | 3-axle combination maximum gross weight* | 4-axle combination maximum gross weight* |
|---|---|---|
| *On interstate and federal-aid highways, single-axle weight limit shall not exceed 20,000 lb and federal weight formula should be applied to axle groupings; on other highways, single axle weight limit shall not exceed 22,400 lb. | ||
| 25 | 54,500 | |
| 26 | 55,500 | |
| 27 | 56,000 | |
| 28 | 57,000 | 60,500 |
| 29 | 57,500 | 61,500 |
| 30 | 58,500 | 62,000 |
| 31 | 59,000 | 62,500 |
| 32 | 60,000 | 63,500 |
| 33 | 64,000 | |
| 34 | 64,500 | |
| 35 | 65,500 | |
| 36 | 66,000 | |
| 37 | 66,500 | |
| 38 | 67,500 | |
| 39 | 68,000 | |
For a combination of truck-tractor and single semitrailer with 5 or more axles and a gross weight not exceeding 73,280 pounds, the weight on single axle shall not exceed 22,400 lb and weight on tandem shall not exceed 36,000 lb.
For a combination of truck-tractor and single semitrailer equipped with 5 or more axles and a gross weight in excess of 73,280 lb, or a combination of truck-tractor and more than one trailing unit:
- Total gross weight shall not exceed 80,000 lb including all law enforcement tolerances, and the overall gross weight on a group of two or more consecutive axles shall not exceed that produced by the federal weight formula. (Two consecutive sets of tandem axles may carry a gross load of 34,000 lb each provided the overall distance between the first and last axles of such consecutive sets is 36 ft or more for divisible loads only and the 80,000-lb limit is not exceeded.)
Note: Special weight limits for divisible loads only can be applied to vehicles that have been certified pursuant to RSA 266:18-d and are driven on roads other than the interstate and defense highway system. For example, a truck tractor and semitrailer with 6 or more axles can have a gross weight up to 99,000 lb. For more information on these special weight limits, call the New Hampshire Department of Safety.
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Copyright 2024 J. J. Keller & Associate, Inc. For re-use options please contact copyright@jjkeller.com or call 800-558-5011.