Cal. Streets and Highways Code - SHC § 36617. Section 36617.
This part provides an alternative method of financing certain improvements and activities. The provisions of this part shall not affect or limit any other provisions of law authorizing or providing for the furnishing of improvements or activities or the raising of revenue for these purposes. Every improvement area established pursuant to the Parking and Business Improvement Area Law of 1989 (Part 6 (commencing with Section 36500) of this division) is valid and effective and is unaffected by this part.