South Carolina Trucking Regulations

South Carolina follows the federal 80,000 lbs GVW limit on interstate highways. The South Carolina Department of Transportation (SCDOT) issues oversize/overweight permits through the Oversize/Overweight Permit Office. Single-trip permits start at $30. South Carolina operates weigh stations along I-95, I-26, I-85, and I-77. The South Carolina State Transport Police (STP) conducts CMV enforcement — a dedicated commercial vehicle law enforcement division. Overweight fines start at $0.04/lb for the first 1,000 lbs over the limit. South Carolina has specific bridge weight restrictions on many older state highway bridges, particularly in rural Lowcountry areas.

The Port of Charleston is one of the fastest-growing container ports on the East Coast. The new Hugh K. Leatherman Terminal significantly expanded capacity. Port drayage requires TWIC cards and port-specific appointment systems. The I-26 corridor from Charleston to Columbia and I-526 around Charleston handle heavy container traffic. The South Carolina Ports Authority has invested in inland port facilities at Greer (near I-85/BMW) and Dillon (near I-95), creating new drayage patterns. Charleston's port handles significant automotive freight — BMW Manufacturing in Greer (the largest BMW plant globally by volume) ships vehicles through the port. Volvo's manufacturing plant in Ridgeville also generates major freight.

South Carolina requires intrastate carriers to register with the South Carolina Public Service Commission (PSC) for motor carrier authority. The state follows federal HOS and ELD regulations without significant additions. South Carolina requires annual safety inspections for commercial vehicles at authorized stations. The state enforces IFTA and IRP requirements. South Carolina has no vehicle personal property tax (it charges an annual vehicle tax based on assessed value). The state's growing automotive manufacturing sector (BMW, Volvo, Mercedes van plant) generates significant freight. Hurricane preparedness is important — the state activates lane reversal plans on I-26 for Charleston evacuations.