['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" 14' auto-transporters | 13' 6" 14' auto-transporters |
| Length: | National Network | State and Other Supplemental Highways |
| Bus | 45' | 45' |
| Articulated bus | ||
| Straight Trucks | 40' | 40' |
| Straight truck and trailer | No overall limit with legal trailer | 53' |
| Tractor-semitrailer combinations | No limit | No limit |
| Semitrailer | 53' | 53' |
| Tractor-twin-trailer combination | No limit | Not allowed |
| Trailers of twin-trailer combinations | 28' 6" | Not allowed |
| Boat-transporter combination | 75' | NS |
| Overhang limitations | 3' front, 4' rear | NS |
| Stinger-steered boat-transporter | ||
| Overhang limitations | ||
| Auto-transporter | 75' | NS |
| Overhang limitations | 3' front, 4' rear | NS |
| Stinger-steered auto-transporter | 75' | NS |
| Overhang limitations | 3' front, 4' rear | NS |
| Saddlemount | 75' | NS |
| General overhang limitations | ||
| Drawbar | 15' | 15' |
| Dromedary | ||
| Kingpin to rearaxle | 41' to the center of the rear axle assembly or to the center of the tandem axle assembly. 46' to the center of the rear axle for trailers or semitrailers used primarily to transport vehicles used in connection with motorsports competition events. | 41' to the center of the rear axle assembly or to the center of the tandem axle assembly. 46' to the center of the rear axle for trailers or semitrailers used primarily to transport vehicles used in connection with motorsports competition events. |
| Length special limitations or restrictions | ||
| Weight: | Interstate and Defense Highways | State and Other Supplemental Highways |
| Steer axle | ||
| Single axle | 20,000 | 20,000 |
| Tandem axle | 35,200 | 36,000 |
| Tridem axle | ||
| Gross vehicle weight | 80,000 | 80,000 |
| Load per inch width of tire | ||
| Per wheel | 10,000 | 10,000 |
| Tolerances | N/S | 10% |
| APU allowance | 550 | 550 |
| Natural gas allowance | 2,000 | 2,000 |
| Weight special limitations or restrictions | ||
Bridge rules
| The gross weight of a vehicle or combination of vehicles, operated or moved upon any Interstate, highway or section of highway may not exceed: | Pounds: |
| 1. Single-unit vehicle with two axles | 38,500 |
| 2. Single-unit vehicle with three axles | 50,600 |
| 3. Single-unit vehicle with four axles | 69,850 |
| 4. Single-unit vehicle with five of more axles | 71,500 |
| 5. Combination of vehicles with three axles | 55,000 |
| 6. Combination of vehicles with four axles | 71,500 |
| 7. Combination of vehicles with five or more axles | 80,608 |
The gross weight imposed upon the highway by two or more consecutive axles in tandem articulated from a common attachment to the vehicle and spaced not less than 40 inches nor more than 96 inches apart shall not exceed 36,000 pounds, and no one axle of any such group of two or more consecutive axles shall exceed the load permitted for a single axle. The load imposed on the highway by two consecutive axles, individually attached to the vehicle and spaced not less than 40 inches nor more than 96 inches apart, shall not exceed 36,000 pounds and no one axle of any such group of two consecutive axles shall exceed the load permitted for a single axle. The gross weight imposed upon the highway by all axles of a single-unit vehicle with four axles shall not exceed the following:
| Distance between the extremes of the front and rear axles measured to the nearest foot | Maximum Gross Weight |
|---|---|
| At least 12 feet | 50,000 |
| At least 13 feet | 50,500 |
| At least 14 feet | 51,500 |
| At least 15 feet | 52,000 |
| At least 16 feet | 52,500 |
| At least 17 feet | 53,500 |
| At least 18 feet | 54,000 |
| At least 19 feet | 54,500 |
| At least 20 feet | 55,500 |
| At least 21 feet | 56,000 |
| At least 22 feet | 56,500 |
| At least 23 feet | 57,500 |
| At least 24 feet | 58,000 |
| At least 25 feet | 58,500 |
| At least 26 feet | 59,500 |
| At least 27 feet | 60,000 |
| At least 28 feet | 60,500 |
| At least 29 feet | 61,500 |
| At least 30 feet | 62,000 |
| At least 31 feet | 62,500 |
| At least 32 feet | 63,500 |
The 10% enforcement tolerance applies to the vehicle weight limits specified here except the gross weight on a single axle operated on the Interstate may not exceed 20,000 pounds; the gross weight on a tandem axle operated on the interstate may not exceed 35,200 pounds; and the overall gross weight may not exceed 75,185 pounds, including all enforcement tolerances.
| At Least | Bridge Formula | + | 10% Tolerance |
|---|---|---|---|
| 16 feet | 58,000 | = | 63,800 |
| 17 feet | 58,500 | = | 64,350 |
| 18 feet | 59,000 | = | 64,900 |
| 19 feet | 60,000 | = | 66,000 |
| 20 feet | 60,500 | = | 66,500 |
| 21 feet | 61,000 | = | 67,100 |
| 22 feet | 61,500 | = | 67,650 |
| 23 feet | 62,500 | = | 68,750 |
| 24 feet | 63,000 | = | 69,300 |
| 25 feet | 63,500 | = | 69,850 |
| 26 feet | 64,000 | = | 70,400 |
| 27 feet | 65,000 | = | 71,500 |
| 28 feet | 65,500 | = | 71,500 |
| 29 feet | 66,000 | = | 71,500 |
| 30 feet | 66,500 | = | 71,500 |
| 31 feet | 67,500 | = | 71,500 |
| 32 feet | 68,000 | = | 71,500 |
| 33 feet | 68,500 | = | 71,500 |
| 34 feet | 69,000 | = | 71,500 |
| 35 feet | 70,000 | = | 71,500 |
| 36 feet | 70,500 | = | 71,500 |
| 37 feet | 71,000 | = | 71,500 |
| 38 feet | 71,500 | = | 71,500 |
Vehicles with an overall maximum gross weight in excess of 75,185 pounds may operate upon any highway or section of highway in the Interstate System in accordance with the following:
The weight imposed upon the highway by any group of two or more consecutive axles may not, unless specially permitted by the Department, exceed an overall gross weight produced by the application of the following formula:
 |
As an exception, two consecutive sets of tandem axles may carry a gross load of 68,000 pounds if the overall distance between the first and last axles of the consecutive sets of tandem axles is 36 feet or more. Additionally, the gross weight imposed upon the highway by any one axle of a vehicle may not exceed 20,000 pounds, and the gross weight imposed upon the highway by any group of two or more axles spaced not less than forty nor more than 96 inches apart (tandem axle) may not exceed 34,000 pounds, and the overall maximum gross weight except for those vehicles which have been issued special permits by the Department, may not exceed 80,000 pounds. The formula is expressed by the following table:
| Distance in feet between the extremes of any group of 2 or more consecutive axles | Maximum load in pounds carried on any group of 2 or more consecutive axles | |||||
|---|---|---|---|---|---|---|
| 2 axles | 3 axles | 4 axles | 5 axles | 6 axles | 7 axles | |
| 4 | 35,200 | |||||
| 5 | 35,200 | |||||
| 6 | 35,200 | |||||
| 7 | 35,200 | |||||
| 8 and less | 35,200 | 35,200 | ||||
| more than 8 | 38,000 | 42,000 | ||||
| 9 | 39,000 | 43,000 | ||||
| 10 | 40,000 | 43,500 | ||||
| 11 | 44,000 | |||||
| 12 | 45,000 | 50,000 | ||||
| 13 | 45,500 | 50,500 | ||||
| 14 | 46,500 | 51,500 | ||||
| 15 | 47,500 | 52,000 | ||||
| 16 | 48,000 | 52,500 | 58,000 | |||
| 17 | 48,500 | 53,500 | 58,500 | |||
| 18 | 49,500 | 54,000 | 59,500 | |||
| 19 | 50,500 | 54,500 | 60,000 | |||
| 20 | 51,000 | 55,500 | 60,500 | 66,000 | ||
| 21 | 51,500 | 56,000 | 61,000 | 66,500 | ||
| 22 | 52,500 | 56,500 | 61,500 | 67,000 | ||
| 23 | 53,000 | 57,500 | 62,500 | 68,000 | ||
| 24 | 54,000 | 58,000 | 63,000 | 68,500 | 74,000 | |
| 25 | 54,500 | 58,500 | 63,500 | 69,000 | 74,500 | |
| 26 | 55,500 | 59,500 | 64,000 | 69,500 | 75,000 | |
| 27 | 56,000 | 60,000 | 65,000 | 70,000 | 75,500 | |
| 28 | 57,000 | 60,500 | 65,500 | 71,000 | 76,500 | |
| 29 | 58,000 | 61,500 | 66,000 | 71,500 | 77,000 | |
| 30 | 58,500 | 62,000 | 66,500 | 72,000 | 77,500 | |
| 31 | 59,500 | 62,500 | 67,500 | 72,500 | 78,000 | |
| 32 | 60,000 | 63,500 | 68,000 | 73,000 | 78,500 | |
| 33 | 64,000 | 68,500 | 74,000 | 79,000 | ||
| 34 | 64,500 | 69,000 | 74,500 | 80,000 | ||
| 35 | 65,500 | 70,000 | 75,000 | |||
| 36 | 68,000 | 70,500 | 75,500 | |||
| 37 | 68,000 | 71,000 | 76,000 | |||
| 38 | 68,000 | 71,500 | 77,000 | |||
| 39 | 68,000 | 72,500 | 77,500 | |||
| 40 | 68,500 | 73,000 | 78,000 | |||
| 41 | 69,500 | 73,500 | 78,500 | |||
| 42 | 70,000 | 74,000 | 79,000 | |||
| 43 | 70,500 | 75,000 | 80,000 | |||
| 44 | 71,500 | 75,500 | ||||
| 45 | 72,000 | 76,000 | ||||
| 46 | 72,500 | 76,500 | ||||
| 47 | 73,500 | 77,500 | ||||
| 48 | 74,000 | 78,000 | ||||
| 49 | 74,500 | 78,500 | ||||
| 50 | 75,500 | 79,500 | ||||
| 51 | 76,000 | 80,000 | ||||
| 52 | 76,500 | |||||
| 53 | 77,500 | |||||
| 54 | 78,000 | |||||
| 55 | 78,500 | |||||
| 56 | 79,500 | |||||
| 57 | 80,000 | |||||
Enforcement tolerances allowed in Section 56-5-4160 do not apply to vehicles with an overall gross weight in excess of 75,185 pounds.
Except on the interstate highway system:
(a) Dump trucks, dump trailers, trucks carrying agricultural products, concrete mixing trucks, fuel oil trucks, line trucks, and trucks designated and constructed for special type work or use are not required to conform to the axle spacing requirements of this section. However, the vehicle is limited to a weight of twenty thousand pounds for each axle plus scale tolerances and the maximum gross weight of these vehicles may not exceed the maximum weight allowed by this section for the appropriate number of axles, irrespective of the distance between axles, plus allowable scale tolerances.
(b) Concrete mixing trucks which operate within a fifteen-mile radius of their home base are not required to conform to the requirements of this section. However, these vehicles are limited to a maximum load of the rated capacity of the concrete mixer, the true gross load not to exceed sixty-six thousand pounds. All of these vehicles shall have at least three axles each with brake-equipped wheels.
(c) Well-drilling, boring rigs, and tender trucks are not required to conform to the axle spacing requirements of this section. However, the vehicle is limited to seventy thousand pounds gross vehicle weight and twenty-five thousand pounds for each axle plus scale tolerances.
['Size and Weight Limits']
['Sizes and weights']