Fullerton is crossed by four state-maintained highways (all maintained by Caltrans' 12th district), three of which are freeways. State Route 91 runs east-to-west down the length of the city south of Orangethorpe Avenue. It intersects with Interstate 5, the Santa Ana Freeway, in the west near Magnolia Avenue and with State Route 57, the Orange Freeway, in the east near State College Boulevard. Imperial Highway, which is part of State Route 90, also runs through a small portion of the north end of the city.