Cal. Pen. Code § 245.2
Every person who commits an assault with a deadly weapon or instrument or by any means of force likely to produce great bodily injury upon the person of an operator, driver, or passenger on a bus, taxicab, streetcar, cable car, trackless trolley, or other motor vehicle, including a vehicle operated on stationary rails or on a track or rail suspended in the air, used for the transportation of persons for hire, or upon the person of a station agent or ticket agent for the entity providing such transportation, when the driver, operator, or agent is engaged in the performance of his or her duties, and where the person who commits the assault knows or reasonably should know that the victim is engaged in the performance of his or her duties, or is a passenger, shall be punished by imprisonment in the state prison for three, four, or five years.
Ca. Pen. Code § 245.2