California Code, Education Code - EDC § 39843

(a) The county superintendent of schools, the superintendent of a school district, a charter school, or the owner or operator of a private school that provides transportation to or from a school or school activity shall notify the Department of Motor Vehicles, in a form and manner that the Department of Motor Vehicles specifies, within five calendar days after the county office of education, the governing board of a school district, the charter school, the owner or operator of the private school, or, in situations where the transportation services are contracted out, the driver's employer, has done both of the following:

(b) For purposes of this section, escorting pupils pursuant to paragraph (1) of subdivision (d) of Section 22112 of the Vehicle Code shall not be considered leaving the immediate vicinity of the vehicle.

(c) For purposes of this section, “gross negligence” means the want of even scant care or an extreme departure from the ordinary standard of conduct.