The state board shall adopt regulations to require a passenger in a school pupil activity bus equipped with passenger restraint systems in accordance with Section 27316.5 of the Vehicle Code to use a passenger restraint system so that the passenger is properly restrained by that system.
Source:
Section 39831.2, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=EDC§ionNum=39831.2..