Interstate 26 runs 349 miles from Kingsport, Tennessee to Charleston, South Carolina, threading the Blue Ridge Mountains and serving as the principal corridor between the Tennessee Valley, the Carolinas Piedmont, and the Atlantic at the Port of Charleston. The route is critical to the southeastern auto-manufacturing supply chain, connecting BMW Spartanburg, Volvo Charleston, and Boeing North Charleston.
For freight, I-26 is the dominant container drayage corridor for Port of Charleston traffic, and the Spartanburg interchange with I-85 is one of the busiest truck transfers in the South. Truck volumes are heavy throughout, particularly the Asheville-to-Spartanburg segment that crosses the Blue Ridge.
Geographically I-26 climbs the Blue Ridge from Asheville at Sam's Gap (3,400 ft) on a sustained grade — one of the steepest interstate climbs east of the Mississippi. The route then descends into the South Carolina Piedmont and runs flat across the coastal plain to Charleston. Weather hazards include sudden Appalachian fog at Sam's Gap, severe spring storms, and hurricane evacuation contraflow from coastal South Carolina.
- Crosses three states: TN, NC, SC
- Sam's Gap (3,400 ft) is one of the steepest interstate climbs in the East
- Principal container drayage corridor for Port of Charleston
- Connects to BMW Spartanburg, Volvo Charleston, and Boeing North Charleston
- Designated hurricane evacuation route from coastal South Carolina
- Concurrent with I-95 briefly near Walterboro, SC area junction
- Toll-free across its entire 349-mile length