S.C. Code § 57-5-1140
The department shall construct at its expense with its maintenance forces the portion within the right-of-way of entrances and aprons to state highways at any point necessary to render adequate ingress and egress to the abutting property at locations where the driveways will not constitute hazardous conditions. The driveways must be of access to existing developed property or property that is being developed for the personal use of the owner and not for speculative or resale purposes. An entrance ten feet wide (paved portion) measured at right angles to the centerline of the driveway is the maximum width for one-way traffic. An entrance sixteen feet wide (paved portion) is the maximum width for two-way traffic. If pipe culvert is necessary for drainage, the department shall install the amount necessary for twelve inch, fifteen inch, eighteen inch, twenty-four inch, or thirty inch pipe. Should the driveway installation require pipe larger than thirty inches, the department may install the pipe and charge the homeowner for the difference in cost between thirty inch pipe and larger diameter pipe required. Driveways requiring drainage structures other than pipe must be brought to the attention of the State Maintenance Engineer. The entrances to be constructed as outlined in this section shall include base and surfacing as necessary to provide an all weather driveway entrance. If wider entrances or additional entrances are requested and approved, the construction may be performed by the department at the owner's expense.
S.C. Code § 57-5-1140