S.C. Code Ann. § 57-23-1100: Scenic byways.

(A) South Carolina Highway 170 from the South side of the Broad River to its intersection with South Carolina Highway 462 is designated as a state scenic highway.

(B) United States Highway 278 from its intersection with South Carolina Highway 170 to State Road S-80 at Sea Pines Circle on Hilton Head Island is designated as Hilton Head Island Scenic Byway.

(C) South Carolina Highway 46 from its intersection with the Jasper/Beaufort County line to its intersection with State Road S-66 in the Town of Bluffton, State Road S-66 from its intersection with South Carolina Highway 46 to its intersection with State Road S-13, and State Road S-13 from its intersection with State Road S-66 to Brighton Beach on the May River, all totaling approximately eleven miles, are designated as the May River Scenic Byway.

(D) The Department of Transportation shall install appropriate markers or signs to implement these designations.