S.C. Code § 6-7-1240
After the local planning commission shall have prepared and adopted a comprehensive plan or at least the major street portion of such plan and upon receiving approval thereof by the appropriate governing authority, the local planning commission may make or cause to be made surveys for the exact location of the lines of proposed new, extended, widened and otherwise improved streets and highways in the whole or in any portion of the municipality or county and to make and certify to the governing authority a map or maps of the area thus surveyed on which are indicated the lines recommended by the local planning commission as the mapped lines of the rights-of-way required for future streets and highways and for future extensions, widenings and other improvements to existing streets and highways.
After the local planning commission shall have prepared and adopted a comprehensive plan or at least the public building sites, public open spaces or public utilities portion of such comprehensive plan, and upon receiving approval thereof by the appropriate governing authority, the local planning commission may make or cause to be made, from time to time, surveys of the exact location of the boundary lines of proposed new and enlarged sites for public buildings, public parks, public playgrounds, public utilities and other public open spaces in the whole or in any portion of the municipality or county and to make and certify to the governing authority of the municipality or to the governing authority of the county maps of the areas thus surveyed on which are indicated the locations of the lines recommended by the planning commission as the mapped boundary lines of future public building sites, public parks, public playgrounds, public utilities and other future open space areas.
The making or certifying of such maps by the planning commission shall be in the form of a recommendation and shall not of itself constitute the opening or establishment of any street or highway or public building site or public park, public playground, public utility or other public open space or the taking or acceptance of any land for such purpose.
S.C. Code § 6-7-1240