Cal. Veh. Code § 2800.4

Whenever a person willfully flees or attempts to elude a pursuing peace officer in violation of Section 2800.1, and the person operating the pursued vehicle willfully drives that vehicle on a highway in a direction opposite to that in which the traffic lawfully moves upon that highway, the person upon conviction is punishable by imprisonment for not less than six months nor more than one year in a county jail or by imprisonment in the state prison, or by a fine of not less than one thousand dollars ($1,000) nor more than ten thousand dollars ($10,000), or by both that fine and imprisonment.