An owner of a fleet of three or more vehicles who is not an interstate carrier may be licensed by the director as a licensed station, if the owner complies with the rules and regulations of the bureau. Those fleet owner stations shall not certify the adjustment of lamps or brakes except on vehicles which constitute the owner’s fleet.
Source:
Section 9888.4, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=BPC§ionNum=9888.4..