State highway bonds shall bear interest, payable on such occasions as shall be prescribed by the State Fiscal Accountability Authority. Each issue of state highway bonds shall mature in annual series or installments, which shall mature not more than twenty-five years after such date. Such installments or series may be equal or unequal in amount. State highway bonds may, in the discretion of the State Fiscal Accountability Authority, 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. State highway bonds shall not be redeemable before maturity unless they contain a statement to that effect.