Charleston SC Traffic & Road Conditions

Roads & Traffic Patterns

How Charleston County Moves: Highways, Commutes & Freight

A driver's-eye reference to the interstates, US highways, commute corridors, and freight infrastructure that define how Charleston gets where it's going.

Major Highways in Charleston County

Charleston County sits at the convergence of Interstate 26 (I-26), Interstate 526 (I-526, Mark Clark Expressway), Interstate 95 (I-95), US-17 (Savannah Hwy / Septima Clark Pkwy / Crosstown / Coleman Blvd), US-52 (Rivers Ave / Meeting Street Rd), US-78 (Dorchester Rd / Rivers Ave merge), SC-7 (Sam Rittenberg Blvd / Mark Clark / Cosgrove Ave), SC-30 (James Island Connector), SC-61 (Ashley River Rd), SC-700 (Maybank Hwy), and Arthur Ravenel Jr. Bridge. Together these routes carry essentially every commercial truck, commuter car, and out-of-state visitor that touches Charleston in a given day — which is why a single closure or rolling backup on any one of them ripples across the rest within minutes.

• Interstate 26 (I-26)
  primary east-west interstate; Charleston to Columbia to Asheville NC; terminates at US-17 downtown.
• Interstate 526 (I-526, Mark Clark Expressway)
  partial bypass; West Ashley to Mt Pleasant via North Charleston; extension to James/Johns Island in long-running planning (Mark Clark Extension project).
• Interstate 95 (I-95)
  west of metro, ~45 min from downtown via I-26.
• US-17 (Savannah Hwy / Septima Clark Pkwy / Crosstown / Coleman Blvd)
  primary coastal route; runs through downtown Charleston via the Septima P. Clark Parkway.
• US-52 (Rivers Ave / Meeting Street Rd)
  North Charleston / Goose Creek corridor.
• US-78 (Dorchester Rd / Rivers Ave merge)
  Summerville to Charleston.
• SC-7 (Sam Rittenberg Blvd / Mark Clark / Cosgrove Ave)
  West Ashley arterial.
• SC-30 (James Island Connector)
  limited-access spur connecting peninsula to James Island.
• SC-61 (Ashley River Rd)
  historic plantation corridor, West Ashley to Summerville.
• SC-700 (Maybank Hwy)
  James Island to Johns Island to Kiawah.
• Arthur Ravenel Jr. Bridge
  US-17 cable-stayed bridge over the Cooper River (Mt Pleasant-downtown); 8 lanes; opened 2005; replaced the Grace and Pearman bridges.

Freight, Inland Port & Airport Traffic

All figures sourced from state DOT traffic counts, the state Department of Public Safety fact book, the regional ports authority, and the local airport district — refreshed as new annual reports drop. Live conditions, accidents, and lane closures are above; this section explains the system those incidents move through.