The State of California Cal Trans website has a great page with many links to answer most of the questions you may have regarding weight and size limits, oversize permits and many more subjects.
CLICK HERE for this information.
Who Must Stop At The Truck Scales?
Good question! Here is information that we have borrowed from the State of California to help you with this question. Please ask our sales team for more information.
California's “Commercial Vehicle Enforcement Facilities" are commonly called weigh stations or truck scales. These facilities are operated by the California Highway Patrol (CHP), not by Caltrans. However, Caltrans receives many inquiries about weigh stations. This page is designed to answer some of those questions.
California Vehicle Code Section 2813 outlines who must stop at weigh stations and inspection stations:
2813. Every driver of a commercial vehicle shall stop and submit the vehicle to an inspection of the size, weight, equipment, and smoke emissions of the vehicle at any location where members of the California Highway Patrol are conducting tests and inspections of commercial vehicles and when signs are displayed requiring the stop. Every driver who fails or refuses to stop and submit the vehicle to an inspection when signs are displayed requiring that stop is guilty of a misdemeanor.
California Vehicle Code Section 260 defines “commercial vehicle" (bolding and underlining added):
(a) A “commercial vehicle" is a motor vehicle of a type required to be registered under this code used or maintained for the transportation of persons for hire, compensation, or profit or designed, used, or maintained primarily for the transportation of property.
(b) Passenger vehicles which are not used for the transportation of persons for hire, compensation, or profit and housecars are not commercial vehicles.
(c) Any vanpool vehicle is not a commercial vehicle.
STILL NOT SURE IF YOU NEED TO STOP
For more information re. who must stop at the scales, contact: California Highway Patrol's Commercial Vehicle Section at (916) 445-1865.
Or, if you know which weigh station you will be passing, you may call the facility directly. See the scale facility list for phone numbers.
Excerpt from Cal Trans website. Here is the direct link: Scales