['Size and Weight Limits']
['Sizes and weights']
03/13/2025
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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 | ||
| Articulated bus | ||
| Straight Trucks | 40' | 40' |
| Straight truck and trailer | ||
| Tractor-semitrailer combinations | No limit | No limit |
| Semitrailer | 53' | 53' |
| Tractor-twin-trailer combination | No limit | No limit |
| Trailers of twin-trailer combinations | 30' | 30' |
| Boat-transporter combination | ||
| Overhang limitations | ||
| Stinger-steered boat-transporter | ||
| Overhang limitations | ||
| Auto-transporter | ||
| Overhang limitations | ||
| Stinger-steered auto-transporter | NS | NS |
| Overhang limitations | 4' front, 6' rear | 3' front, 4' rear |
| Saddlemount | ||
| General overhang limitations | 3' front, 4' rear | 3' front, 4' rear |
| Drawbar | ||
| Dromedary | ||
| Kingpin to rearaxle | ||
| 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 | 34,000 24,000 lb on 57,650 lb routes | 34,000 24,000 lb on 57,650 lb routes |
| Tridem axle | ||
| Gross vehicle weight | 80,000 | 80,000 |
| Load per inch width of tire | 550 | 550 |
| Per wheel | ||
| Tolerances | None | 5% on tandem, 2% on GVW if no scale available at the point of origin. |
| APU allowance | ||
| Natural gas allowance | 2,000 | |
| Weight special limitations or restrictions | ||
Bridge rules
Mississippi uses the federal bridge formula to determine maximum gross vehicle weight and maximum axle group weight limits on Mississippi highways. Some state highway routes have what is referred to as a “low weight road limit.” These highways have a limit of 57,650 pounds.
FEDERAL BRIDGE FORMULA
Highways found to be suitable for carrying the maximum weights computed by the Federal Bridge Formula (federally designated highways plus selected other highways) are designated by the State Highway Commission. On these highways, the maximum total combined weight carried on any group of two or more consecutive axles shall be determined by the formula:
Gross weight of vehicle and loads
(1) On all highways of the State of Mississippi except those referred to in Table III, and subject to the limitations imposed on wheel and axle loads, the total combined weight (vehicles plus load) on any group of axles shall not exceed the value given in the following table (Table I), corresponding to the distance in feet between the extreme axles of the group, measured longitudinally to the nearest foot:
| Distance in feet between the extreme of any group of axles | Maximum load in pounds carried on any group of axles | Distance in feet between the extreme of any group of axles | Maximum load in pounds carried on any group of axles |
| 4 | 28,650 | 21 | 44,800 |
| 5 | 29,650 | 22 | 45,700 |
| 6 | 30,640 | 23 | 46,590 |
| 7 | 31,630 | 24 | 47,470 |
| 8 | 32,610 | 25 | 48,350 |
| 9 | 33,580 | 26 | 49,220 |
| 10 | 34,550 | 27 | 50,090 |
| 11 | 35,510 | 28 | 50,950 |
| 12 | 36,470 | 29 | 51,800 |
| 13 | 37,420 | 30 | 52,650 |
| 14 | 38,360 | 31 | 53,490 |
| 15 | 39,300 | 32 | 54,330 |
| 16 | 40,280 | 33 | 55,160 |
| 17 | 41,160 | 34 | 55,650 |
| 18 | 42,080 | 35 | 56,800 |
| 19 | 42,990 | 36 or greater | 57,650 maximum |
| 20 | 43,900 |
Moreover, in addition to the per axle weight limitation specified by wheel and axle loads, the maximum load carried on a combination of vehicles shall be subject to the following additional limitations: The maximum load carried on any group of two (2) axles shall not exceed twenty-four thousand (24,000) pounds in instances where one (1) or more of such axles is a driving axle (that is, an axle turned by the vehicle's engine power).
An axle group shall consist of any two (2) or more consecutive axles of any vehicle or combination of vehicles.
Gross weight of vehicle and loads
Subject to the limitations imposed on wheel and axle loads, and to the further limitations specified, the total combined weight (vehicles plus load) on any group of axles of a vehicle or a combination of vehicles shall not exceed the value given in the following table (Table III) corresponding to the distance in feet between the extreme axles of the group, measured longitudinally to the nearest foot.
| Distance in feet between the extreme 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 | 34,000 | |||||
| 5 | 34,000 | Axle groups in these spacings impractical. | ||||
| 6 | 34,000 | |||||
| 7 | 34,000 | |||||
| 8 | 34,000 | 34,000 | ||||
| 9 | 39,000 | 42,500 | ||||
| 10 | 40,000 | 43,500 | ||||
| 11 | 44,000 | |||||
| 12 | 45,000 | 50,000 | ||||
| 13 | 45,500 | 50,500 | ||||
| 14 | 46,500 | 51,500 | ||||
| 15 | 47,000 | 52,000 | ||||
| 16 | 48,000 | 52,500 | 58,000 | |||
| 17 | 48,500 | 53,500 | 58,500 | |||
| 18 | 49,500 | 54,000 | 59,000 | |||
| 19 | 50,000 | 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 | 57,500 | 61,500 | 66,000 | 71,500 | 77,000 | |
| 30 | 58,500 | 62,000 | 66,500 | 72,000 | 77,500 | |
| 31 | 59,000 | 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 | 80,000 | ||
| 36 | 66,000 | 70,500 | 75,500 | 80,000 | ||
| 37 | 66,500 | 71,000 | 76,000 | 80,000 | ||
| 38 | 67,500 | 71,500 | 77,000 | 80,000 | ||
| 39 | 68,000 | 72,500 | 77,500 | 80,000 | ||
| 40 | 68,500 | 73,000 | 78,000 | 80,000 | ||
| 41 | 69,500 | 73,500 | 78,500 | 80,000 | ||
| 42 | 70,000 | 74,000 | 79,000 | 80,000 | ||
| 43 | 70,500 | 75,000 | 80,000 | 80,000 | ||
| 44 | 71,500 | 75,500 | 80,000 | 80,000 | ||
| 45 | 72,000 | 76,000 | 80,000 | 80,000 | ||
| 46 | 72,500 | 76,500 | 80,000 | 80,000 | ||
| 47 | 73,500 | 77,500 | 80,000 | 80,000 | ||
| 48 | 74,000 | 78,000 | 80,000 | 80,000 | ||
| 49 | 74,500 | 78,500 | 80,000 | 80,000 | ||
| 50 | 75,500 | 79,000 | 80,000 | 80,000 | ||
| 51 | 76,000 | 80,000 | 80,000 | 80,000 | ||
| 52 | 76,500 | 80,000 | 80,000 | 80,000 | ||
| 53 | 77,500 | 80,000 | 80,000 | 80,000 | ||
| 54 | 78,000 | 80,000 | 80,000 | 80,000 | ||
| 55 | 78,500 | 80,000 | 80,000 | 80,000 | ||
| 56 | 79,500 | 80,000 | 80,000 | 80,000 | ||
| 57 | 80,000 | 80,000 | 80,000 | 80,000 | ||
Moreover, in addition to the per axle weight limitations specified, two (2) consecutive sets of tandem axles may carry a gross load of thirty-four thousand (34,000) pounds each, providing that the overall distance between the first and last axles of such consecutive sets of tandem axles is thirty-six (36) feet or more. Such overall gross weight may not exceed eighty thousand (80,000) pounds, including all enforcement tolerances.
['Size and Weight Limits']
['Sizes and weights']