Caltrans 12

Caltrans District 12 encompasses the entirety of Orange County and was established by the California State Legislature in 1988. The jurisdictional boundaries of the District, Orange County, encompass a metropolitan area of 794 square miles, including 34 cities and 3 million people (as of 2009), and is crisscrossed by 17 state highway routes. To provide for the transportation needs of the traveling public, District 12 maintains and operates 279 route miles of highway and 226 directional miles of full time High Occupancy Vehicle (HOV) or carpool lanes, one of the largest HOV lane networks in California.