Cal. Penal Code § 588a

Any person who throws or deposits any oil, glass bottle, glass, nails, tacks, hoops, wire, cans, or any other substance likely to injure any person, animal or vehicle upon any public highway in the State of California shall be guilty of a misdemeanor; provided, however, that any person who willfully deposits any such substance upon any public highway in the State of California with the intent to cause great bodily injury to other persons using the highway shall be guilty of a felony.