 In Southern California, the highway is a heavily traveled commuter route serving the Northwest portion of the Greater Los Angeles area; this includes Ventura County communities in the West Conejo Valley and in the Oxnard Plain, along with Los Angeles County communities in the East Conejo Valley and San Fernando Valley.The route is the Santa Ana Freeway from East Los Angeles to Downtown Los Angeles.It becomes the Hollywood Freeway north of Downtown Los Angeles through the Cahuenga Pass, before turning west and becoming the Ventura Freeway.