California commercial vehicle weight limits follow the federal Interstate standard of 80,000 lbs gross, 20,000 lbs per single axle, and 34,000 lbs per tandem axle group. The federal bridge formula (23 U.S.C. 127) applies on all routes. No seasonal weight restrictions on Interstate highways. Oversize and overweight permits are available from CA DOT for loads exceeding standard limits. Verify current road-specific postings with the California DOT before routing heavy loads.
The federal bridge formula limits the weight on any group of axles based on the distance between the outermost axles in the group. It applies in California on all routes where federal standards apply.
W = maximum weight in lbs · L = axle spacing in feet · N = number of axles
Caltrans issues permits for oversize and overweight vehicles. Online permit system available at permit.dot.ca.gov. Annual permits available for qualifying routine operations. Superloads require individual route survey and engineering approval.
Apply for California OS/OW Permit →On California Interstate highways, the maximum gross vehicle weight is 80,000 lbs — matching the federal standard. California's bridge formula also applies, which may limit loads on certain routes. State highways and local roads may have lower posted limits.
Yes. Many California bridges are posted with lower weight limits. Caltrans maintains a bridge posting program — always check bridge clearances and weight postings for your route at dot.ca.gov before hauling.
California Air Resources Board (CARB) requires diesel trucks over 14,000 lbs GVWR operating in California to meet specific emissions standards. The Truck and Bus regulation phased out pre-2010 engines for most fleets. Check CARB's website for current requirements and any applicable exemptions before operating in California.
Caltrans issues oversize and overweight permits through their online permit system at permit.dot.ca.gov. Single-trip permits are available for most oversize loads. Annual permits are available for qualifying routine heavy-haul operations.
California allows 54,000 lbs on a tridem axle group (three consecutive axles within a 9-foot spread) — significantly higher than most other states. This benefits triple-axle dump trucks and similar vehicles.
Find flatbed trucks, lowboys, and heavy-haul equipment from dealers in California.
Disclaimer
The information on this page is compiled from publicly available government sources and is provided for general informational purposes only. TruckRadar is an independent search engine — we are not affiliated with any government agency and this content does not constitute legal or compliance advice. Regulations change frequently; always verify current requirements directly with the official source before making compliance decisions.
Official source: California CA Department of TransportationLast reviewed: 2026-04