Mississippi Truck Weight Limits

How much a truck can weigh in Mississippi

Mississippi runs the federal 80,000, 20,000 single, 34,000 tandem (Miss. Code 63-5-33). A harvest permit lets you haul unprocessed forest and farm products up to 84,000 off the Interstate. Overweight penalties are graduated per pound under 63-5-49, roughly a cent a pound at 1,000 over and climbing with the excess. Run a harvest load over 100,000 and it is $2,500 for a first offense in a year, $3,500 for a second, and you lose the permit on the third.

Axles, off-Interstate, and permits

• Off the Interstate: 80,000 lb base; up to 84,000 with a harvest permit (non-Interstate only)
• Single axle: 20,000 lb
• Tandem axle: 34,000 lb
• With a permit: Harvest permit up to 84,000 lb for unprocessed forest and farm products, valid off the Interstate only. Higher weights by oversize/overweight permit.
• Harvest permits are not valid on Interstate highways. The exact per-pound cents-per-bracket schedule is drawn from the referenced statute and aggregators; treat the mid-range figures as directional and confirm with MDOT.

Posted bridge and road limits

Mississippi posts load-limited bridges and roads on MUTCD R12 signs. WEIGHT LIMIT X TONS is short tons (2,000 lb), so 10 TONS means 20,000 lb. A posted limit overrides the legal max: a legal 80,000-lb truck cannot cross a bridge posted below its weight and must detour. Crossing a posted structure over the limit is a separate offense and can carry liability for damage to the bridge.

What running heavy costs

Graduated per pound under Miss. Code 63-5-49 (schedule at 27-19-89): about $10 for 999 lb or less over; roughly 1 cent per pound at 1,000-1,999 over, 2 cents at 2,000-2,999, climbing to about 7 cents per pound by 7,000+ over. Run a harvest-permit load over 100,000 and it is $2,500 for a first violation in twelve months, $3,500 for a second, and loss of the permit for 30 days on a third.

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