Business and Professions Code § 12725

A weighmaster shall not certify to the gross weight of a vehicle if all of the following conditions prevail:

(a) The scale is located at the site where the vehicle is loaded.

(b) The vehicle is weighed before entering a highway.

(c) The vehicle’s gross weight exceeds 80,000 pounds, or exceeds 82,000 pounds if the vehicle is a near-zero-emission or zero-emission vehicle as defined in subdivisions (c) and (d) of Section 44258 of the Health and Safety Code, unless a special permit authorizing a greater gross weight for the vehicle has been issued pursuant to Section 35780 of the Vehicle Code.