Vehicle Code section 9404
(a)
Station wagons, except those used in the transportation of passengers for hire, are exempted from the payment of weight fees provided for in Section 9400.(b)
For purposes of this section, “engaged in a business” means engaged in a bona fide trade, business,, commerce, or in a profession in which the measurement of land, construction quantities, or the dimension of structures, is a function authorized to be performed by the license issued for such profession, but does not include being engaged in any other type of profession.
Source:
Section 9404, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=VEH§ionNum=9404.
(accessed May 4, 2025).