California Trucking Regulations

California enforces the strictest emissions regulations in the nation through the California Air Resources Board (CARB). The Truck and Bus Regulation requires all heavy-duty diesel trucks operating in California to have 2010 or newer model year engines. Beginning January 2024, the Advanced Clean Fleets (ACF) rule mandates that drayage trucks entering ports or railyards must be zero-emission by 2035. CARB's In-Use Off-Road Diesel-Fueled Fleets regulation also affects construction and specialty trucks. Out-of-state carriers are NOT exempt — any truck entering California must comply with CARB standards. Violations carry fines of $1,000 per day per vehicle, and CARB inspectors conduct enforcement at ports, border crossings, and major truck stops. The CARB compliance label must be visible during inspections. Carriers should verify compliance through CARB's TRUCRS reporting system before entering the state.

California's Assembly Bill 5 (AB 5), codified in Labor Code Section 2750.3, applies the ABC test for worker classification. Under this law, a worker is an employee unless the hiring entity proves: (A) the worker is free from control, (B) performs work outside the usual course of the hiring entity's business, and (C) is independently established in that trade. The Federal Aviation Administration Authorization Act (FAAAA) preempts AB 5 for motor carriers in certain scenarios, and the Supreme Court's 2024 ruling in the California Trucking Association case provided some relief. However, owner-operators leased to California-based carriers may still face classification challenges. Carriers operating in California should consult legal counsel regarding their owner-operator lease agreements. The Franchise Tax Board and Employment Development Department actively audit trucking companies for misclassification, with penalties including back taxes, benefits, and fines.

California enforces its own bridge formula that is stricter than the federal formula in some configurations. The maximum GVW on California highways is 80,000 lbs, matching federal standards, but the state calculates allowable axle weights differently. The California Legal weight for a 5-axle combination is based on the Bridge Formula B plus California-specific axle spacing requirements. Kingpin-to-rear-axle (KPRA) distance must not exceed 40 feet for a standard 53-foot trailer. Caltrans issues oversize/overweight permits through the Transportation Permits system, with single-trip permits starting at $16. California imposes a $10,000+ fine for operating overweight without a permit. Weight enforcement is conducted at over 70 permanent and temporary weigh stations, with the I-5 Grapevine stations being among the busiest in the nation.

California imposes a 55 mph speed limit for all commercial trucks with three or more axles (California Vehicle Code 22406), regardless of the posted speed limit for passenger vehicles. This applies to all highways, including interstates where cars may travel at 65-70 mph. California has proposed legislation for mandatory speed limiters on commercial vehicles, following the FMCSA's federal speed limiter rulemaking. Violations of the truck speed limit carry fines of $238+ and one point on the driver's record. Excessive speeding (15+ mph over) can result in misdemeanor charges. California Highway Patrol actively enforces truck speeds, particularly on the I-5, I-15, and SR-99 corridors. Drivers accustomed to running 65-70 mph in other states should adjust their trip planning to account for the 55 mph limit, which adds approximately 1.5-2 hours to a Los Angeles-to-Sacramento run compared to other states' speed limits.