Who this is for: new motor carriers, owner-operators, small fleets, dispatch assistants
Do I Need a USDOT Number? — FMCSA Registration Guide
A USDOT number is required for interstate carriers operating CMVs with a GVWR of 10,001 lbs or more, vehicles transporting 9+ passengers for compensation, 16+ passengers without compensation, or hazmat requiring placards. Registration is free through FMCSA's Unified Registration System (URS).
What Is a USDOT Number?
A USDOT number is a unique identifier issued by the Federal Motor Carrier Safety Administration (FMCSA) to carriers that operate commercial motor vehicles (CMVs) in interstate commerce. It is used to collect and monitor safety information about carriers, including compliance reviews, roadside inspections, and crash reports.
Who Is Required to Register?
Under 49 CFR Part 390, you generally need a USDOT number if you operate in interstate commerce and any of the following apply: (1) the vehicle has a GVWR or GCWR of 10,001 pounds or more; (2) the vehicle is designed to transport 9 or more passengers (including the driver) for compensation; (3) the vehicle is designed to transport 16 or more passengers (including the driver) without compensation; or (4) the vehicle is used to transport hazardous materials in quantities requiring placards. "Interstate commerce" includes crossing state lines or operating in a state as part of a trade or transportation originating in another state.
Intrastate Operations
Some states require a USDOT number even for intrastate operations (entirely within one state). Requirements vary by state. Check with your state's Department of Transportation or motor carrier authority for intrastate registration requirements. FMCSA's registration system handles federal (interstate) USDOT numbers; intrastate-only carriers may need a state-issued number instead.
How to Register for a USDOT Number
Registration is done through FMCSA's Unified Registration System (URS) online. You will need to provide: legal business name and address, nature of operation (carrier type, cargo, hazmat status), vehicle information, and contact information. Registration is free. Once submitted, you receive a USDOT number immediately (pending FMCSA processing). Carriers must also file an MCS-150 form and keep it updated every 24 months. Visit the FMCSA Registration page for the current registration portal and instructions.
Displaying the USDOT number on your vehicle
Once registered, the USDOT number must be displayed on both sides of each power unit in lettering at least 2 inches tall. The display must include the carrier's legal name or trade name and the USDOT number itself. This is one of the first things a DOT officer checks at a roadside stop — a vehicle without a visible USDOT number, or one displaying an inactive or deactivated number, draws immediate scrutiny. Use commercial vinyl lettering or a durable magnetic sign. A printed paper label taped to the door is not going to hold up to months of road exposure and is a problem waiting to happen at a scale house.
Keeping your registration current when things change
A USDOT number reflects only what you reported when you registered — or at your last MCS-150 update. When your fleet grows, your cargo type changes, or you add hazmat operations, update the MCS-150 promptly rather than waiting for the next biennial cycle. Operating under a USDOT number with materially inaccurate information — especially misrepresenting fleet size or operation type — creates compliance exposure in enforcement actions and can affect insurance coverage. Significant operational changes should be reported when they happen.
Frequently Asked Questions
Can I operate while my USDOT registration is pending?
FMCSA issues a USDOT number electronically upon completing the online application. However, new carriers are placed in a New Entrant monitoring period and must pass a safety audit within 18 months. Operating before registration is complete can result in significant civil penalties.
Is a USDOT number the same as operating authority?
No. A USDOT number identifies the carrier for safety monitoring purposes. Operating authority (an MC number) is a separate requirement for for-hire interstate carriers transporting passengers or regulated commodities. Private carriers and certain exempt commodity carriers may need a USDOT number but not operating authority.
What happens if I let my USDOT registration lapse?
FMCSA deactivates USDOT numbers that are not updated via the MCS-150 biennial update. Operating on a deactivated USDOT number is a violation and can result in enforcement action.