Updated October 2026. This 2019 article has been refreshed to separate USDOT identification from operating authority.
Do you need a USDOT number, interstate operating authority, both, or neither? For a limo or passenger operation, the answer depends on the trip, vehicle, compensation and applicable exceptions. An airport pickup alone does not settle it.
1. Check whether your operation needs a USDOT number
A USDOT number identifies the carrier in FMCSA’s registration and safety systems. Under FMCSA’s passenger-carrier answer, an interstate operation needs one if a vehicle is designed or used for 9–15 people, including the driver, and operated for compensation; is designed or used for 16 or more, including the driver; or has an actual weight or GVWR of at least 10,001 pounds. State rules can also require a USDOT number for intrastate operations.
2. Check interstate for-hire operating authority separately
An MC number or operating authority is a different registration question. FMCSA generally requires passenger operating authority when a carrier transports passengers for compensation in interstate commerce, subject to specific exceptions. Being issued a USDOT number does not automatically mean every carrier needs operating authority. Nor does a vehicle’s seating capacity, by itself, settle every driver-file, hours-of-service or other safety-rule question. Review the type of trip and vehicle before applying a rule to your entire fleet. See FMCSA’s operating-authority explanation.
3. Don’t guess about airport trips
FMCSA explains that a highway leg wholly within one state can be part of interstate travel when it was prearranged as part of a continuous trip that began or ended in another state or country. A ride arranged only after a passenger arrives is not automatically a continuation of the earlier interstate trip. FMCSA also describes limited airport-area and commercial-zone exceptions. Read its multi-modal passenger transportation guide before treating every out-of-state passenger or affiliate booking as proof of interstate authority requirements.
What to gather before you register
- List each vehicle’s designed/used passenger capacity and weight rating.
- Identify whether each service is for-hire and how compensation is received.
- Map trips across state lines and any prearranged airport, rail or port connections.
- Check federal exceptions and your state’s intrastate requirements.
Then use FMCSA’s current registration guidance or ask a qualified adviser to check your specific operation. LBC can help organize the carrier information and next steps; the decision should not be made from a blanket “all limo companies need both” rule.
