S.C. Code Ann. § 11-43-600

Transportation infrastructure bonds shall bear interest, payable on such occasions as shall be prescribed not more than thirty years after such date. Such installments or series may be equal or unequal in amount. Transportation infrastructure bonds, in the discretion of the state board, may be made subject to redemption at par and accrued interest, plus such redemption premium as it shall approve and on such occasions as it may prescribe. Transportation infrastructure bonds are not redeemable before maturity unless they contain a statement to that effect.