If additionally secured as provided in this subsection, the bonds or notes, notwithstanding other provisions of this act, may be made payable or subject to purchase on demand or prior to maturity at the option of the holder at the time and in the manner as determined by the state transportation commission or the designated person as provided in the resolution authorizing the bonds or notes. Any bonds or notes authorized by this section may bear no interest or interest at a rate or rates which may be variable but which shall be subject to the limitations provided in section 18e as provided in the resolution authorizing the obligations. If bonds or notes are subject to payment or purchase on demand or prior to maturity at the option of the holder, and the obligation of the state to make payment or effect purchases on demand or prior to maturity, at the option of the holder is limited to the proceeds of 1 or more of the additional security devices described in this subsection and is not payable from constitutionally restricted funds deposited in the comprehensive transportation fund or the state trunk line fund, for purposes of computing maximum annual principal and interest requirements under subsections (5) and (6), the principal and interest on the bonds or notes subject to payment or purchase on demand or prior redemption at the option of the holder shall be disregarded and the maximum annual principal and interest requirements which would arise with respect to the repayment of the proceeds of the additional security device shall be substituted therefor.
MCL 247.668b