S.C. Code Ann. § 57-25-15: Highway signs.

The prohibition of Section 57-25-10 does not extend to a welcome sign or other sign providing directions to a public facility or event erected by the governing body of a county, municipality or organized church if the sign presents no traffic hazard. If the sign is placed on a highway right-of-way, it must meet the approval of the department for size, location, and supports.