Streets and Highways Code § 33129

The authority may provide for the issuance of bonds in series, and for the division of any issue into two or more divisions, and may fix different maturities or dates of such bonds, different rates of interest, or prescribe different terms and conditions for the bonds of the several series or divisions. After having authorized or issued bonds the authority may from time to time thereafter authorize and issue other bonds, subject to any covenants it may have made restricting the future issuance of bonds.