California Code, Streets and Highways Code - SHC § 30922

Any action or proceeding to contest, question, or deny the validity of a toll increase provided for in this chapter, the financing of the transportation program contemplated by this chapter, the issuance of any bonds secured by those tolls, or any of the proceedings in relation thereto, shall be commenced within 60 days from the date of the election at which the toll increase is approved.  After that date, the financing of the program, the issuance of the bonds, and all proceedings in relation thereto, including the adoption, approval, and collection of the toll increase, shall be held valid and incontestable in every respect.