FAQs

The Mark Clark Extension is a Priority project. Design and construction cost estimates for extending the Mark Clark Expressway from West Ashley onto Johns and James Island total $2.33 billion with $1.83 billion in funding coming from the 3rd Transportation Sales Tax. A portion of the funds collected through a third half-cent sales and use tax will go toward the design and construction costs associated with extending the road.

No. The 1st TST referendum, approved by voters in 2004, called for the tax to expire in 2031 or when $1.3 billion had been collected. Current projections are that the $1.3 billion will be collected by 2025. The 3rd TST, if approved in 2024, will be a replacement of the expiring 1st TST.

Charleston County staff requested project ideas from the South Carolina Department of Transportation, the Charleston-Berkeley-Dorchester Council of Governments, and local municipalities.

No. Only a portion of the projects presented on this website will be funded.

Yes! Please include any project ideas you have in the general feedback portion of the comment form.

The cost of construction materials and labor have risen significantly post pandemic. To continue to provide resurfacing work, local paving, intersection and bike/pedestrian improvements, funding for the different allocations must be increased.

Various factors like available funding, financing of the Mark Clark extension, and other factors, will determine when these projects could begin construction.

Capacity enhancements is defined as allowing more motorists to pass through a particular corridor or intersection. Constructing traffic circles, turn lanes, new roads, and widening existing roads could all be considered “capacity enhancements.” Funding, the characteristics of neighborhoods affected, public input, right-of-way needs, among other variables all have an effect on the type of capacity enhancements appropriate for each project.

Safety is a priority for all of Charleston County’s transportation projects. However, some proposed projects’ primary purpose is to improve safety.