California Code, Penal Code - PEN § 640.7

Any person who violates Section 594,640.5, or640.6on or within 100 feet of a highway, or its appurtenances, including, but not limited to, guardrails, signs, traffic signals, snow poles, and similar facilities, excluding signs naming streets, is guilty of a misdemeanor, punishable by imprisonment in a county jail not exceeding six months, or by a fine not exceeding one thousand dollars ($1,000), or by both that imprisonment and fine. A second conviction is punishable by imprisonment in a county jail not exceeding one year, or by a fine not exceeding one thousand dollars ($1,000), or by both that imprisonment and fine.