Trucking Regulations in South Carolina
Complete guide to weight limits, speed limits, permits, chain laws, and special rules for commercial truck drivers operating in South Carolina.
Max Gross Weight
80,000 lbs
Truck Speed Limit
70 mph (same as cars)
Diesel Tax
$0.28 per gallon diesel + federal
Weight & Size Limits in South Carolina
| Measurement | Limit |
|---|---|
| Max Gross Vehicle Weight | 80,000 lbs |
| Max Axle Weight | 20,000 lbs single axle, 34,000 lbs tandem |
| Max Trailer Length | 53 ft trailer |
| Max Width | 102 inches |
| Max Height | 13'6" |
Speed Limits for Trucks in South Carolina
Rural Interstate
70 mph
Urban Interstate
55 mph
Truck-Specific
70 mph (same as cars)
Fuel Tax & Tolls in South Carolina
Diesel Fuel Tax
$0.28 per gallon diesel + federal
Toll Roads & Bridges
Southern Connector (Greenville area toll road). Cross Island Parkway (Hilton Head). Limited toll infrastructure.
Chain Laws & Weather Requirements
No chain law. Winter weather is rare except in the Upstate mountains.
Oversize & Overweight Permits
SCDOT Oversize/Overweight Permits. Online permitting available. South Carolina is generally accommodating to oversize loads.
Port of Entry & Weigh Stations
Weigh stations on I-85, I-95, I-77, I-26, I-20. SC Highway Patrol commercial vehicle enforcement.
Special Rules for South Carolina
Hazmat Route Restrictions
Hazmat restricted through downtown Charleston and Columbia. Port of Charleston has specific hazmat protocols. Designated routes avoid Hilton Head and Myrtle Beach tourism areas.
Rest Area & Parking Rules
Rest areas and welcome centers allow truck parking. SC has adequate rest area coverage on interstates. No anti-idling law.
DOT Inspection Frequency
Moderate. SC Highway Patrol focuses on I-85, I-95, and I-26 to Charleston port corridor.
Looking for Trucking Jobs in South Carolina?
Browse CDL driver positions and connect with carriers operating in South Carolina.
Frequently Asked Questions About South Carolina Trucking Regulations
What trucking is generated by the Port of Charleston?
The Port of Charleston is one of the fastest-growing container ports on the East Coast, handling over 2.7 million TEUs annually. It generates massive drayage traffic on I-26 between Charleston and the Inland Port in Greer. The port's growth has made South Carolina a major logistics hub.
What is the truck speed limit in South Carolina?
South Carolina allows 70 mph for trucks on rural interstates, matching passenger vehicles. Urban areas are 55 mph. There is no differential truck speed limit in South Carolina.
What automotive manufacturing freight is in South Carolina?
BMW in Spartanburg (largest BMW plant globally), Volvo in Ridgeville, and nearby Mercedes in Vance, Alabama all generate significant automotive parts and finished vehicle freight through South Carolina. The I-85 corridor between Greenville and Spartanburg is one of the most industrialized stretches in the Southeast.
Are there toll roads in South Carolina?
South Carolina has minimal tolling: the Southern Connector toll road near Greenville and the Cross Island Parkway on Hilton Head Island. Otherwise, the state's interstates and highways are toll-free.
How does hurricane season affect South Carolina trucking?
Hurricane season (June through November) can significantly impact the coastal areas, particularly Charleston, Myrtle Beach, and Hilton Head. Evacuation orders redirect traffic inland. I-26 becomes a one-way evacuation route during major storms. Storm damage can close I-95 and US-17 for days.