South Carolina Highway 340South Carolina Highway 340 is a State [highway (US)|state highway] in the U.S. state of South Carolina. The highway connects the Timmonsville, [South Carolina|Timmonsville] area with Darlington.Route descriptionSC 340 begins at an intersection with South Carolina [Highway 403|SC 403] north-northwest of Timmonsville, within Darlington County. It travels to the northeast and crosses Middle Swamp and Myrtle Branch before an interchange with Interchange 20. It crosses over Jeffries Creek and High Hill Creek before entering the city limits of Darlington. There, it intersects U.S. Route 52. It crosses some railroad tracks before it meets its northern terminus, an intersection with SC 34.