Cal. Pen. Code § 1463.26
Notwithstanding Section 1463, out of moneys deposited with the county treasurer pursuant to Section 1463, there shall be transferred, once a month, to the traffic fund of the city, an amount equal to one-third of all fines and forfeitures collected during the preceding month upon the conviction of, or upon the forfeiture of bail by, any person charged with a violation of Section 21655.5 or 21655.8 of the Vehicle Code within that city, and an amount equal to one-third of those fines and forfeitures shall be transferred into the general fund of the county, and an amount equal to one-third of those fines and forfeitures shall be transferred to the agency whose approval is required for high-occupancy vehicle lanes on state highways pursuant to Section 21655.6 of the Vehicle Code. If the arrest for a violation of either Section 21655.5 or 21655.8 of the Vehicle Code was not within a city, then 50 percent of the fines and forfeitures shall be transferred to the general fund of the county and 50 percent shall be transferred to the agency having authority to approve high-occupancy vehicle lanes pursuant to Section 21655.6 of the Vehicle Code. Money received by the agency having the authority to approve high-occupancy vehicle lanes pursuant to Section 21655.6 of the Vehicle Code shall be used by that agency for the purposes of improving traffic flow and traffic operations upon the state highway system within the jurisdiction of that agency. In counties where there exists a county transportation commission created pursuant to Division 12 (commencing with Section 130000) of the Public Utilities Code, that commission is the agency for purposes of this section.
Ca. Pen. Code § 1463.26