S.C. Code Ann. § 57-3-618

Notwithstanding another provision of law, the Department of Transportation may impose and collect a toll on the proposed Interstate 73 corridor upon completion of this highway project. This toll must be used to pay for the cost of planning, right-of-way acquisitions, financing, construction, operation, and other expenses associated with this highway project, and for the removal of the tolls upon payment of all such costs. This toll must not be imposed upon a state-owned or district-owned school bus.