Under § 160A-181.1(c)(2), cities and counties in North Carolina have explicit authorization to regulate signs and outdoor advertising dealing with sexually oriented businesses. Additionally, under § 121.35, local governments may use conservation agreements to limit signs, billboards or other advertising. (See Conservation Easements, above.) Even in the absence of other overt authority, however, local governments have broad powers in this area, apparently derived from their police powers. See, e.g., Summey Outdoor Advertising, Inc. v. County of ..