Mississippi

Mississippi interstate GVW limit: 80,000 lbs. Per-axle limits: Single axle 20,000 lbs, Tandem axle 34,000 lbs, Tridem axle 42,000 lbs. Federal bridge formula applies. Enforcement tolerance: 5% tolerance on individual axle weights.

Height: 13 ft 6 in. Width: 8 ft 6 in. Trailer length: 53 ft (semitrailer). Overall combination length: 65 ft combination.

Over-Dimensional permits through MDOT online portal. HB150 (2025): concrete haulers and solid waste vehicles have separate weight schedule — 64,000 lbs GVW (3-axle) or 72,000 lbs GVW (4-axle); axle limits for those vehicles: single axle 22,000 lbs, two-axle tandem 48,000 lbs, three-axle tandem 57,000 lbs Fees: Single-trip: $15; Annual: $50+. Illinois oversize permits are not directly honored in Mississippi. You will need to obtain a Mississippi-specific permit for oversize/overweight loads. Apply online: https://mdot.ms.gov/portal/over-dimensional_permits Enforcement: Weigh stations on major highways; MHP enforcement; per-pound fines.

Agricultural: Agricultural products exempt on state highways; farm vehicles within 150 miles of farm. Timber/Forestry: Timber vehicles allowed up to 84,000 lbs on designated state roads.

For the most current weight and size regulations, permit applications, and seasonal restriction updates, visit the official Mississippi DOT page at https://mdot.ms.gov/portal/over-dimensional_permits. Contact the Mississippi Department of Transportation for specific routing questions.