As used in this article:
(a) “Carquinez Bridge” means those certain bridge spans on Interstate Route 80 across the Carquinez Straits near Crockett, together with any existing or new and additional approaches thereto, necessary or desirable to connect with the present spans or any additional spans and the toll collection facilities to serve both the existing bridge span and any additional spans.
(b) “Benicia-Martinez Bridge” means the toll bridge across the Carquinez Straits on Interstate Route 680 connecting the Cities of Benicia and Martinez, together with any existing or new and additional approaches thereto, necessary or desirable with respect to the present span or any spans and toll collection facilities for the bridge and any additional spans.