California Trucking Regulations

California is the largest trucking market in the United States by freight volume and regulatory complexity. The ports of Los Angeles and Long Beach together form the largest container gateway in North America, generating massive drayage freight demand. Inland Empire (Ontario/Riverside) serves as the dominant West Coast warehousing and distribution hub. California imposes far more stringent environmental regulations than any other state — the California Air Resources Board (CARB) enforces the Drayage Truck Regulation, the In-Use Off-Road Diesel Vehicle Regulation, and the Truck and Bus Regulation, all of which require diesel fleets to meet escalating engine model year or emissions standards. California also has unique independent contractor rules under AB 5 that affect how carriers classify drivers. Carriers must obtain a California Motor Carrier Permit (MCP) from the CA DMV in addition to their USDOT number. State weight limits and some dimensional limits (53-foot trailer max on many state highways) differ from neighboring states.

Trucking authority and registration

  • Authority: California Department of Motor Vehicles — Motor Carrier Permits Branch (MCP, IRP, IFTA)
  • IRP jurisdiction: Yes (https://www.dmv.ca.gov/portal/vehicles/commercial-vehicles/international-registration-plan-irp/)
  • IFTA jurisdiction: Yes (https://www.dmv.ca.gov/portal/vehicles/commercial-vehicles/international-fuel-tax-agreement-ifta/)
  • DOT permit required: Yes — All motor carriers operating in California must obtain a California Motor Carrier Permit (MCP) from the CA DMV in addition to any USDOT number. The MCP must be renewed annually.

Weight limits

GVWR80,000 lbs federal interstate standard
Single axle20,000 lbs
Tandem axle34,000 lbs

California limits trailer length to 53 feet on most state highways (vs. longer configurations permitted in some other states). Longer combinations require special permits. Caltrans issues oversize/overweight permits.

Notable regulations

  • CARB Drayage Truck Regulation: drayage trucks serving California ports and intermodal rail facilities must meet 2010 or newer model year engine standards (or equivalent emissions), with a phase-in to zero-emission requirements beginning 2024.
  • CARB Truck and Bus Regulation: diesel trucks and buses with GVWR over 26,000 lbs operating in California must meet progressive engine model year requirements; older engines require filters or replacement.
  • AB 5 (Assembly Bill 5): California's independent contractor classification law significantly restricts the ability to classify truck drivers as independent contractors under the ABC test. Motor carriers must evaluate driver classification carefully to avoid misclassification penalties.
  • California Motor Carrier Permit (MCP): all motor carriers operating in California must obtain and display an annual MCP from the CA DMV — separate from USDOT registration.
  • California's 13-hour driving rule for intrastate operations differs from the federal 11-hour limit; intrastate California carriers operating under California-only HOS rules must comply with the state schedule, though most interstate carriers follow federal HOS.

State trucking association: California Trucking Association

Frequently asked questions

What is CARB's Drayage Truck Regulation and who does it apply to?

CARB's Drayage Truck Regulation applies to diesel trucks visiting California ports and intermodal rail yards. Covered trucks must meet 2010 or newer engine standards or use an approved alternative. Starting in 2024, CARB began phasing in requirements for zero-emission drayage trucks. Out-of-state trucks visiting California ports are subject to these rules.

Do I need a California Motor Carrier Permit even if I have a USDOT number?

Yes. Any motor carrier operating a commercial vehicle in California must obtain a California Motor Carrier Permit (MCP) from the CA DMV, regardless of whether the carrier has a USDOT number. The MCP must be renewed annually and must be carried in the vehicle.

How does AB 5 affect trucking in California?

AB 5 applies a strict ABC test to determine whether a worker is an employee or independent contractor. For trucking, this means most owner-operators who haul exclusively for one motor carrier may be reclassified as employees under California law. Enforcement has continued following court decisions upholding the law's application to the trucking industry.

Are California's Hours of Service rules different from federal rules?

California has its own intrastate HOS rules for drivers operating solely within the state, including a 13-hour daily driving limit (vs. the federal 11-hour rule) and different rest break requirements. Interstate drivers operating in California follow the federal FMCSA HOS rules. Carriers must determine which rules apply based on their operational scope.

Sources

Verified 2026-05-26.