Does a Connecticut truck need a USDOT number for in-state work?
Yes. Connecticut requires a USDOT number for in-state commercial vehicles at 18,001 lb and over (GVWR, GCWR or actual weight), even if they never cross a state line.
Checked against Connecticut’s official sources in September 2026.
The rule in Connecticut
Who it covers: Any motor vehicle or motor carrier (as defined in 49 CFR Part 390) in intrastate commerce at 18,001 lb or more, whether for-hire or private; also placarded hazmat vehicles and passenger vehicles above the federal seat counts.
The weight line: An in-state-only truck needs an intrastate DOT number, and falls under the state-adopted federal safety rules, at 18,001 lb or more by rating or actual weight. Placarded hazmat vehicles and certain passenger vehicles are covered at any weight.
Exemptions the state lists:
- Federal hours-of-service limits (49 CFR Part 395) do not apply to drivers of utility service vehicles (C.G.S. § 14-163c(b))
“You need an intrastate DOT number if you operate any motor vehicle that is: engaged in intrastate commerce and has a gross vehicle weight rating or gross combination weight rating or gross vehicle weight or gross combination weight of 18,001 or more pounds” source
“is in intrastate commerce and has a gross vehicle weight rating or gross combination weight rating or gross vehicle weight or gross combination weight of eighteen thousand one or more pounds” source
Who to ask: Connecticut Department of Motor Vehicles, Commercial Vehicle Safety Division
Safety rules for in-state trucks
The DMV Commissioner may adopt regulations incorporating 49 CFR Parts 382-397 and apply them to intrastate vehicles of 18,001 lb or more; CT DMV says both interstate and intrastate carriers are subject to the adopted federal rules. (Conn. Gen. Stat. § 14-163c)
- The intrastate line (18,001 lb) differs from the interstate line (10,001 lb).
- A company revoked as an interstate carrier can't become an intrastate carrier until FMCSA lifts the revocation.
The federal lines, which apply in Connecticut too
- 10,001 lb and interstate commerce: a USDOT number, a medical card, a driver qualification file, the hours-of-service rules and daily inspections (49 CFR 390.5).
- 26,001 lb: a CDL, for a single vehicle or a combination towing more than 10,000 lb (383.5). The CDL rules cover in-state driving as well (383.3), and drug and alcohol testing follows the CDL (382.103).
Check your own truck and trailer
Questions
Does Connecticut require a USDOT number for intrastate trucks?
Yes. Connecticut requires a USDOT number for in-state commercial vehicles at 18,001 lb and over (GVWR, GCWR or actual weight), even if they never cross a state line.
What is the CDL weight in Connecticut?
The same as everywhere: 26,001 lb for a single vehicle, or a combination of 26,001 lb towing more than 10,000 lb. The federal CDL rules apply to in-state driving too (49 CFR 383.3), and drug and alcohol testing follows the CDL (382.103).
Who administers the rule in Connecticut?
Connecticut Department of Motor Vehicles, Commercial Vehicle Safety Division.
What we could not confirm
- Connecticut DMV's own regulations (§ 14-163c-1 and following) could not be read, so their exact wording, and any in-state differences for driver age or medical cards, are unconfirmed.
Sources
- CT DMV, Get or update a DOT number
- Conn. Gen. Stat. ch. 246, § 14-163c (Connecticut General Assembly)
- FMCSA, Do I Need a USDOT Number? (state list)
General information, not legal advice. It summarises Connecticut’s published rules as read in September 2026; confirm with the Connecticut DMV or FMCSA.