Except as otherwise provided by statute, the refunding bonds issued under authority of RCW
47.56.770, the bonds authorized by RCW
47.60.560 through
47.60.640, the bonds authorized by RCW
47.26.420 through
47.26.427, and any general obligation bonds of the state of Washington which have been or may be authorized by the legislature after the enactment of those sections and which pledge motor vehicle and special fuel excise taxes for the payment of principal thereof and interest thereon shall be an equal charge and lien against the revenues from such motor vehicle and special fuel excise taxes.