Do I need a USDOT number?
Five quick questions. We compare your answers with the federal definition of a commercial motor vehicle and tell you what it points to. It is a guide, not legal advice.
Source: the federal definition of a commercial motor vehicle in 49 CFR 390.5T and the marking rule in 49 CFR 390.21T. Rules change and states differ: confirm with FMCSA and your state agency before you decide.
How the federal rule is built
A federal USDOT number is tied to the idea of a commercial motor vehicle used in interstate commerce. In the federal text that means a vehicle with a gross vehicle weight rating or gross combination weight rating (or actual weight, whichever is greater) of 10,001 pounds or more, or one designed or used to carry more than 8 passengers for pay or more than 15 without pay, or one used to carry hazardous materials that need placards.
Interstate commerce is wider than crossing a border. It also covers a trip entirely inside one state when it is part of a movement of goods or people that began or will end outside the state.
What goes on the truck
Once a number applies, the marking rule asks for the legal name or a single trade name of the carrier and the USDOT number, preceded by the letters USDOT, on both sides of the vehicle, in letters that contrast sharply with the background and can be read from 50 feet in daylight while the vehicle is stopped. The federal text does not set a letter height. Many states have their own rules for trucks that stay in state, and some use their own numbers: see our state requirements guide.
Next steps
- Not registered yet? The number is issued by FMCSA to your company. Our guide how to get a USDOT number walks through it. We do not issue numbers.
- Already have a number? Build the lettering and see it on a truck door in the door builder, or start from a USDOT decal.
- Not sure? Ask FMCSA or your state's motor carrier agency before you buy lettering.
Common questions
Does a pickup truck need a USDOT number?
It can. The federal rule looks at the weight rating of the truck, or of the truck and trailer together, whichever is greater, and whether the work is interstate. A pickup with a heavy trailer can pass 10,001 pounds as a combination. Our guide on pickup trucks and DOT numbers goes through the common cases.
What does interstate commerce mean?
Under the federal definition it includes trips between states and also a trip that is entirely inside one state when it is part of a movement that started or will end outside the state, such as delivering goods that were shipped in from another state. Many small businesses miss that second case.
What if I only drive inside my own state?
The federal rule is about interstate commerce, but many states have their own rules for intrastate trucks, often starting at 10,001 pounds and in some states at 26,001 pounds or more. Some states ask for a USDOT number, some for their own number. Check your state's agency and our state requirements guide.
Do I need an MC number too?
No, not on the truck. The federal marking rule asks for your name and your USDOT number. An MC number is operating authority for certain for-hire carriers and is a separate registration. Some customers still like to display it.
Can I use the USDOT number before I get it?
No. Wait until the number has been issued to your company. Do not put a number on a truck that is not yours or that has not been activated.