['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 | State and Other Supplemental Highways |
| Bus | 45' | 45' |
| Articulated bus | ||
| Straight Trucks | 45' | 45' |
| Straight truck and trailer | 65' | 65' |
| 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 | ||
| Overhang limitations | ||
| Stinger-steered boat-transporter | ||
| Overhang limitations | ||
| Auto-transporter | No limit with trailer no longer than 52' from point of attachment to the tractor | No limit with trailer no longer than 52' from point of attachment to the tractor |
| Overhang limitations | ||
| Stinger-steered auto-transporter | 80' | NA |
| Overhang limitations | 4' front, 6' rear | NA |
| Saddlemount | ||
| General overhang limitations | ||
| Drawbar | ||
| Dromedary | ||
| Kingpin to rearaxle | 41' to a point midway between the two rear axles, or 44' to the rearmost axle if not a tandem axle | 41' to a point midway between the two rear axles, or 44' to the rearmost axle if not a tandem axle |
| 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 | 34,000 |
| Tridem axle | ||
| Gross vehicle weight | 80,000 | 80,000 |
| Load per inch width of tire | ||
| Per wheel | ||
| Tolerances | ||
| APU allowance | 550 | 550 |
| Natural gas allowance | 2,000 | NA |
| Weight special limitations or restrictions | ||
Bridge rules
Tennessee uses the federal bridge formula to determine maximum gross vehicle weight and maximum axle group weight limits on Tennessee highways.
Carriers must apply the Federal Bridge Formula when determining axle weights and spacing:
where W equals the overall gross weight on any group of two or more consecutive axles to the nearest 500 lbs., 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; except that two consecutive sets of tandem axles may carry a gross load of 34,000 lbs. each, provided the overall distance between the first and last axles of such consecutive sets of tandem axles is 36 feet or more.
['Size and Weight Limits']
['Sizes and weights']