Mississippi commercial vehicle weight limits follow the federal Interstate standard of 80,000 lbs gross, 20,000 lbs per single axle, and 34,000 lbs per tandem axle group. The federal bridge formula (23 U.S.C. 127) applies on all routes. No seasonal weight restrictions on Interstate highways. Oversize and overweight permits are available from MS DOT for loads exceeding standard limits. Verify current road-specific postings with the Mississippi DOT before routing heavy loads.
The federal bridge formula limits the weight on any group of axles based on the distance between the outermost axles in the group. It applies in Mississippi on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
Mississippi DOT issues oversize/overweight permits through the MDOT permit portal. Single-trip and annual permits available. Superloads require engineering review and pre-approved route analysis. Port of Pascagoula industrial moves may require coordination with port authority in addition to state permits.
Apply for Mississippi OS/OW Permit →On Mississippi Interstate highways, the maximum gross vehicle weight is 80,000 lbs — the federal standard. State routes and secondary roads follow the same standard limits. Mississippi has no seasonal spring restrictions. Overweight permits from MDOT are required for loads exceeding standard limits.
No. Mississippi does not impose seasonal spring weight restrictions due to its warm, humid subtropical climate. There is no spring thaw cycle. Year-round operations can proceed without seasonal weight restriction concerns, though state route and secondary road limits must still be observed.
Mississippi oversize/overweight permits are issued by MDOT through the permit portal at mdot.ms.gov. Single-trip permits handle most one-time heavy hauls. Annual permits are available for qualifying recurring operations. Superloads require engineering review and route pre-approval.
Yes. Mississippi provides weight accommodations for agricultural vehicles transporting farm commodities including poultry, catfish, cotton, soybeans, and timber on certain intrastate routes. Implements of husbandry are generally exempt. Contact MDOT for current exemption details and eligible routes.
Industrial and petrochemical hauls from the Port of Pascagoula must comply with Mississippi state weight limits on all public roads. Industrial access roads within the port complex may have separate facility-posted weight limits. Overweight permit loads require MDOT approval and pre-approved routes. Coordinate with the Mississippi State Port Authority for port-specific routing and weight guidance.
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The information on this page is compiled from publicly available government sources and is provided for general informational purposes only. TruckRadar is an independent search engine — we are not affiliated with any government agency and this content does not constitute legal or compliance advice. Regulations change frequently; always verify current requirements directly with the official source before making compliance decisions.
Official source: Mississippi MS Department of TransportationLast reviewed: 2026-04