['Size and Weight Limits']
['Sizes and weights']
03/14/2025
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| Dimension | National Network | State and Other Supplemental Highways |
| Width: | 8' 6" | 8' 6" |
| Height: | 14' | 14' |
| Length: | National Network | On All Others |
| Bus | ||
| Articulated bus | ||
| Straight Trucks | 45' | 45' |
| Straight truck and trailer | 80' | 80' |
| Tractor-semitrailer combinations | No overall limit | No overall limit |
| Semitrailer | 53' | 53' |
| Tractor-twin-trailer combination | No overall limit | No overall limit |
| Trailers of twin-trailer combinations | 28' 6" if towbars do not exceed 19' and the overall length of the trailer-trailer unit including towbars does not exceed 80'. | 28' 6" if towbars do not exceed 19' and the overall length of the trailer-trailer unit including towbars does not exceed 80'. |
| 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 | 4' front, 6' rear |
| Saddlemount | 97' | 75' |
| General overhang limitations | 3' front, 4' rear | 3' front, 4' rear |
| Drawbar | 15' | 15' |
| Dromedary | ||
| Kingpin to rearaxle | ||
| Length special limitations or restrictions | ||
| Weight: | Interstate and Defense Highways | On All Others |
| Steer axle | 20,000 or 600 lb/in. tire width | 20,000 or 600 lb/in. tire width |
| Single axle | 20,000 | 20,000 |
| Tandem axle | 34,000 | 34,000 |
| Tridem axle | ||
| Gross vehicle weight | 80,000 | Federal Bridge Formula |
| Load per inch width of tire | 500 600 lb/in on dual tire axles, axle on permitted vehicle, axle on trailer towed by vehicle with GVWR less than 11,000 lb, or axles equipped with super single tires | 500 600 lb/in on dual tire axles, axle on permitted vehicle, or axle on trailer towed by vehicle with GVWR less than 11,000 lb |
| Per wheel | ||
| Tolerances | ||
| APU allowance | ||
| Natural gas allowance | ||
| Weight special limitations or restrictions | ||
Bridge rules
South Dakota uses the federal bridge formula to determine maximum gross vehicle weight and maximum axle group weight limits on South Dakota highways.
The maximum gross weight of a vehicle or combination is now determined by the following formula:
where W equals the overall gross weight on any group of two or more consecutive axles to the nearest 500 l b, L is the distance in feet to the nearest foot between the extremes of any group of two or more consecutive axles, and N equals the number of axles in the group under consideration; except that 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 of tandem axles is 36 ft or more.
['Size and Weight Limits']
['Sizes and weights']
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