California Code, Penal Code - PEN § 241.5

(a) When an assault is committed against a highway worker engaged in the performance of his or her duties and the person committing the offense knows or reasonably should know that the victim is a highway worker engaged in the performance of his or her duties, the offense shall be punishable by a fine not to exceed two thousand dollars ($2,000) or by imprisonment in a county jail up to one year or by both that fine and imprisonment.

(b) As used in this section, “highway worker” means an employee of the Department of Transportation, a contractor or employee of a contractor while working under contract with the Department of Transportation, an employee of a city, county, or city and county, a contractor or employee of a contractor while working under contract with a city, county, or city and county, or a volunteer as defined in Section 1720.4 of the Labor Code who does one or more of the following: