Cal. Gov. Code § 14530
The commission may deviate, in the adoption of the state transportation improvement program, from a regional transportation improvement program based on a finding that there (a) are inconsistencies between the program and the appropriate guidelines, (b) are insufficient funds available to implement the program, (c) are conflicts between the regional transportation improvement programs, (d) are conflicts between a regional transportation improvement program and the department's recommendations in its transportation improvement program, (e) is an overriding state need for a project to adequately accommodate interregional traffic, or (f) is no adopted congestion management program for a county in which a project is proposed.
Ca. Gov. Code § 14530