S.C. Code Ann. § 56-5-4055: Oversized vehicle on interstate highway.

Notwithstanding any provision of this article, relating to the issuance of permits for the movement of oversized loads or vehicles on the highways of this State or exemptions from permit requirements provided for oversized loads or vehicles, no vehicle or load shall be moved within the interstate highway system if such oversized load or vehicle could not be lawfully moved on the highways of this State pursuant to permit or otherwise on July 1, 1956.