South Carolina Truck Weight Limits

How much a truck can weigh in South Carolina

Standard limit is 80,000 pounds, 20,000 on a single axle, 34,000 on a tandem (S.C. Code 56-5-4130). Overweight fines climb by the pound: 4 cents from 500 to 3,500 over, 6 cents up to 6,000 over, 10 cents past that (S.C. Code 56-5-4160). Run more than 25% over legal and the fine doubles; over 50% and it triples. Route permits can take you up to roughly 130,000 pounds.

Axles, off-Interstate, and permits

• Off the Interstate: 80,000 lb
• Single axle: 20,000 lb
• Tandem axle: 34,000 lb
• With a permit: No routine tier above 80,000 lb. The 130,000 lb figure is a superload permit ceiling, not a routine limit; higher weights move by SCDOT oversize/overweight permit.
• The ~130,000 lb permit ceiling is route-specific and set by SCDOT's OSOW office, so confirm the corridor before hauling; treat that figure as medium confidence.

Posted bridge and road limits

Bridges and local roads post MUTCD 'WEIGHT LIMIT X TONS' signs (short tons). The posted limit overrides the legal max. Crossing a posted bridge over the limit, even slightly, adds a separate fine up to $1,000 and/or up to 30 days, treated as reckless endangerment, plus liability if the structure is damaged.

What running heavy costs

S.C. Code 56-5-4160 charges per pound on the excess: 500-3,500 lb over, 4 cents/lb; 3,501-6,000 lb over, 6 cents/lb; more than 6,000 lb over, 10 cents/lb. The fine doubles when gross exceeds the legal limit by 25-50%, and triples above 50%. Only one citation per load, charged on the greater of the gross or axle overage. Minimum fines run from about $100 (first offense) to $1,000 (third).

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