Streets and Highways Code § 22509

This part shall be liberally construed to effectuate its purpose. Any proceedings taken under this part and any assessment levied pursuant thereto shall not be invalidated for failure to comply with the provisions of this part if such failure does not substantially and adversely affect the rights of any person. All determinations made by the legislative body pursuant to this part shall be final and conclusive in the absence of fraud or prejudicial abuse of discretion.