California Code, Streets and Highways Code - SHC § 30915

(a) With respect to all construction and improvement projects specified in Sections 30913, 30914, and 30914.7, project sponsors and the department shall seek funding from all other potential sources, including, but not limited to, the State Highway Account and federal matching funds. The project sponsors and department shall report to the authority concerning the funds obtained under this subdivision.

(b) Local funds that have previously been committed to projects and programs identified in subdivision (a) of Section 30914.7 shall not be supplanted by the funding assigned to projects and programs pursuant to Section 30914.7 unless the project sponsor has secured a full funding plan for the project, or the local funds are needed to maintain transit service levels or fund a critical safety or maintenance need.