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California DOT compliance means meeting two sets of rules: FMCSA’s federal regulations for interstate work, and California’s own rules, which apply even to trucks that never leave the state. They include a USDOT number, a CA number from the CHP, a DMV motor carrier permit, CHP terminal inspections, state hours of service, ELDs, and CARB emissions rules.
Below we cover each one and how our team can help.
It depends on where your freight moves, but most California carriers answer to three agencies. FMCSA sets the federal safety rules for interstate carriers. The California Highway Patrol (CHP) enforces the state’s motor carrier safety rules, and the DMV issues the state permit. The California Air Resources Board (CARB) sets emissions rules for heavy trucks on California roads, wherever they are registered.
| Your operation | Main rules | Key registrations |
|---|---|---|
| Interstate, 10,001 lb or more | Federal FMCSA safety rules, including federal hours of service | USDOT number; MC number if you haul regulated freight for hire; IRP and IFTA for qualified trucks |
| California only (intrastate) | California Vehicle Code and Title 13 rules enforced by the CHP, including state hours of service | USDOT number, CA number, and motor carrier permit (MCP) |
| Any diesel truck over 14,000 lb GVWR on California roads | CARB Truck and Bus regulation and Clean Truck Check | Clean Truck Check reporting, annual fee, and emissions tests |
FMCSA’s definition of interstate commerce includes a trip between two places in one state when it is part of a movement that starts or ends outside the state. A container hauled from a California port to a warehouse in the state can fall under the federal rules even though the truck never crosses the state line. Our Los Angeles DOT compliance page covers the port and metro side of this.
Yes, in most cases, even if you never leave the state. FMCSA requires one for interstate vehicles of 10,001 pounds or more, and lists California among the states that require a USDOT number from their intrastate commercial vehicle registrants. State law closes the loop: the CHP will not assign a CA number until your application includes your USDOT number (Cal. Vehicle Code 34507.5).
The order matters, because each step needs the one before it:
The CA number must appear on both sides of each regulated vehicle, but a truck that displays a valid USDOT number meets that rule. See our guide on how to mark a commercial motor vehicle for lettering size and placement.
The CHP inspects motor carrier terminals under the Basic Inspection of Terminals (BIT) program (Cal. Vehicle Code 34501.12). It covers carriers that run trucks of three or more axles over 10,000 pounds GVWR, truck tractors and the trailers they pull, truck and trailer combinations over 40 feet, placarded hazardous materials, and commercial vehicles of 26,001 pounds or more.
A terminal rated unsatisfactory must be reinspected within 120 days, and you can request a review of the rating within five business days. An unsatisfactory rating can also lead to suspension of your motor carrier permit. You also can’t hire another carrier subject to the program until it gives you a written certification that it complies.
An honest caveat: you may still see BIT described as an inspection every two years. The current statute uses a performance-based system instead: the CHP prioritizes terminals never inspected before, carriers flagged by safety data, and hazmat terminals, so the timing of your next visit depends on your record.
Intrastate truck drivers in California follow state hours-of-service limits that are longer than the federal ones (13 CCR 1212.5). Interstate drivers, and drivers hauling hazardous substances or hazardous waste, follow federal Part 395.
| Limit | California intrastate | Federal (interstate) |
|---|---|---|
| Driving after 10 hours off duty | 12 hours | 11 hours |
| No driving after | The 16th hour on duty | The 14th hour on duty |
| Weekly on-duty limit | 80 hours in 8 days | 60 hours in 7 days or 70 hours in 8 days |
| Restart | 34 consecutive hours off | 34 consecutive hours off |
Drivers of tank vehicles over 500 gallons hauling flammable liquid are held to 10 hours of driving under the state rule. The federal limits are in 49 CFR 395.3.
Since January 1, 2024, intrastate carriers and drivers must record duty status on an electronic logging device, with no grace period (CHP, Intrastate ELDs). An ELD isn’t required if a driver needs logs on no more than 8 days in any 30-day period, runs a driveaway-towaway operation, or drives a vehicle older than model year 2000. Those drivers still keep paper or electronic logs.
Local drivers can skip logs entirely if they stay within 100 air miles of their work reporting location, are released within 12 hours, and get 10 hours off between shifts, as long as the carrier keeps their time records for six months. If you need a device, Simplex ELD is our electronic logging solution.
Two CARB rules reach almost every heavy diesel truck that runs in the state, including trucks registered elsewhere:
CARB’s Advanced Clean Fleets regulation, after its 2025 amendments, is now described by CARB as a requirement for state and local government agency fleets.
We have an office in Rancho Cucamonga, at 8560 Vineyard Ave, Suite 112, and our team handles California compliance alongside federal compliance, insurance, and permits. That lets us line up your USDOT number, CA number, insurance filings, and motor carrier permit in the right order.
Our compliance programs come in three levels: Simplex Hub for a self-service approach, Essentials for on-demand support, and Managed for full-scale management with a dedicated account manager. The work ranges from driver qualification file management and CSA monitoring to mock audits and hours-of-service management. For IRP, IFTA, and oversize loads, our trucking permits team gives you a dedicated permitting manager, and you can request permits through the Simplex Hub client portal or the Simplex 2GO app.
Use the form below to tell us about your operation. Include your USDOT number, or let us know you don’t have one yet, and our team will follow up with the right next step.
It means meeting FMCSA’s federal rules for interstate work and California’s own rules: a USDOT number, a CA number from the CHP, a DMV motor carrier permit, CHP terminal inspections with 90-day vehicle inspections, state hours of service and ELDs, and CARB emissions rules.
Yes. California is on FMCSA’s list of states that require a USDOT number from intrastate commercial vehicle registrants, and the CHP won’t assign a CA number without one.
Yes, since January 1, 2024, unless an exemption applies, such as needing logs on no more than 8 days in 30, driveaway-towaway work, a pre-2000 vehicle, or the 100 air-mile local driver exemption.
The Basic Inspection of Terminals program is the CHP’s inspection of motor carrier terminals. It checks a sample of your vehicles plus your maintenance, driver, and drug and alcohol testing records, and covers carriers that run trucks of three or more axles over 10,000 pounds, truck tractors, placarded hazmat, and similar vehicles.
Yes. Our California office is at 8560 Vineyard Ave, Suite 112, Rancho Cucamonga, CA 91730. We also have offices in Miami, Houston, and Dallas.
The rules and figures on this page come from these official sources, checked on October 5, 2026.