Cal. Sts. & High. Code § 2191

The department shall, in cooperation with regional transportation planning agencies, identify the significant transportation arteries in the state that connect or provide access to major sea or waterway ports, nationwide railway systems, airports, and interstate and intrastate highway systems, thereby serving as an intermodal corridor of economic significance. The identified corridors shall include, at a minimum, at least one corridor that serves two or more major seaports.