An “expressway” is a portion of highway that is part of either of the following:
(a) An expressway system established by a county under Section 941.4 of the Streets and Highways Code.
(b) An expressway system established by a county before January 1, 1989, as described in subdivision (g) of Section 941.4 of the Streets and Highways Code.
(Added by Stats. 2004, Ch. 615, Sec. 17. Effective January 1, 2005.)