The foregoing sections of this Part shall be deemed to provide an additional and alternative method for the doing of things authorized thereby, and shall be regarded as supplemental and additional to powers conferred by other laws, and shall not be regarded as in derogation of any powers now existing except as otherwise provided herein; provided, however, that the issuance of bridge revenue bonds or refunding bonds under the provisions of this Part need not comply with the requirements of any other law applicable to the issuance of bonds.  

Acts 1958, No. 526, §16.