California Code, Streets and Highways Code - SHC § 31010

(a) There is hereby imposed a seismic retrofit surcharge equal to one dollar ($1) per vehicle for passage on the Bay Area state-owned toll bridges, except for vehicles that are authorized toll-free passage on these bridges.

(b) Funds generated pursuant to subdivision (a) that are in excess of those needed to meet the toll commitment as specified by paragraph (4) of subdivision (b) of Section 188.5shall be available to the authority for funding, consistent with Sections 30913 and 30914, the purposes and projects described in those sections.

(c) Except as provided in subdivision (d), funds generated pursuant to subdivision (a) shall be paid to the authority directly and deposited in the Bay Area Toll Account pursuant to Section 30950.2 and shall constitute revenues of the tolls imposed on the bridges described in Section 30910 for all purposes of Chapter 4.3 (commencing with Section 30950).

(d) Funds generated pursuant to subdivision (a) shall be used exclusively to repay obligations issued by the California Infrastructure and Economic Development Bank and secured by the surcharge imposed by subdivision (a) until they are no longer outstanding, as that term is defined in the constituent instruments defining the rights of the holders of those obligations.  This subdivision shall become inoperative when the obligations are no longer outstanding, as that term is defined in the constituent instruments defining the rights of the holders of those obligations.

(e) The department may increase the amount of the seismic retrofit surcharge identified in subdivision (a) for debt service purposes only on the obligations issued by the California Infrastructure and Economic Development Bank under Chapter 4.6 (commencing with Section 31070) and only for as long as those obligations are outstanding, as that term is defined in the constituent instruments defining the rights of the holders of those obligations, if circumstances exist that have resulted in a reduction in the funds generated by subdivision (a) so as to jeopardize the payment of debt service on those obligations.  This subdivision shall become inoperative when those obligations are no longer outstanding due to their retirement or defeasance.