S.C. Code Ann. § 59-67-490

The boards of trustees of each district shall make a thorough study of transportation needs each year, and shall submit proposed route descriptions in accordance with the limitations of Section 59-67-420 and approved by county school authorities to the State Board of Education annually. All routes served by State-owned equipment shall be subject to the approval of the Board and the local board of trustees; no such equipment shall be operated except upon routes so approved.