California Code, Streets and Highways Code - SHC § 30910

(a) The state-owned toll bridges within the geographic jurisdiction of the Metropolitan Transportation Commission are the following bridges:

(b) The Antioch Bridge, the Benicia-Martinez Bridge, the Carquinez Bridges, and the Richmond-San Rafael Bridge are at times classified as the northern bridge unit, and the Dumbarton Bridge, the San Mateo-Hayward Bridge, and the San Francisco-Oakland Bay Bridge are at times classified as the southern bridge unit. For purposes of operation, rehabilitation, maintenance, and financing, all of the bridges are classified as a single enterprise.