S.C. Code Regs. § § 103-152
Any for-hire motor carrier transporting passengers in interstate commerce which desires to domicile or base any power units in South Carolina, whether owned, leased, or otherwise obtained, must first apply for authorization from this commission corresponding to the type operation which it proposes to conduct. Where it is shown that the motor carrier has STB authority to perform the transportation service proposed, that the motor carrier proposes to transport only interstate movements of passengers that have been exempted from STB regulation, or that the motor carrier proposes to haul only interstate shipments of property or passengers within STB exempt zones, the commission will approve the application without hearing and issue to the motor carrier the appropriate authorization, and thereupon, the motor carrier shall register its motor vehicles based, domiciled, or located in this State in accordance with the provisions of 103-151 and file evidence that the public is protected from bodily injury or property damage as provided in Subarticle 6.
S.C. Code Regs. § 103-152