Cal. Sts. & High. Code § 35432

The bonds issued under Section 35430 to provide additional public parking facilities for the district may in part be secured by those net revenues from parking meters on public ways within the district which were allocated and pledged to the payment of bonds previously issued to the extent the allocation and pledge of such revenues to the payment of the additional bonds is not prohibited by the ordinance, resolution or indenture providing for the bonds previously issued.