California Code, Streets and Highways Code - SHC § 30102

Except as provided in Section 30102.5, the commission, in establishing toll charges, shall give consideration to the cost of operating and maintaining any particular toll bridge or other toll highway crossing, including the cost of insurance, the cost of operating and maintaining any ferry established and operated pursuant to Section 30356, and the amount required annually to meet the redemption of bonds and interest payments thereon.  At all times, the tolls and charges shall be fixed at rates to yield annual revenue equal to the annual operating and maintenance expenses, including insurance costs, the cost of operating and maintaining any ferry established and operated pursuant to Section 30356, and all redemption payments and interest charges of the bonds issued for any particular toll bridge or other toll highway as they fall due.