Does a Alabama truck need a USDOT number for in-state work?

Yes. Alabama requires a USDOT number for in-state commercial vehicles at 26,001 lb and over (GVWR or GCWR), even if they never cross a state line.

Checked against Alabama’s official sources in September 2026.

The rule in Alabama

Who it covers: Intrastate companies (for-hire or hauling their own goods) running commercial motor vehicles of 26,001 lb GVWR/GCWR or more; also buses and hazardous material or hazardous waste haulers at any weight.

The weight line: An in-state-only company needs an intrastate USDOT number, and must follow the federal safety rules, once any truck or truck-and-trailer has a GVWR or GCWR of 26,001 lb or more. At 26,000 lb or less (and not a bus or hazmat/hazardous-waste hauler) it is exempt and no USDOT number is required.

Exemptions the state lists:

Intrastate vehicles with GVWR/GCWR of 26,000 lb or less, other than passenger buses and hazardous material or hazardous waste haulers
Farm-owned vehicles operating within 150 air miles of the farm: no CDL, USDOT marking or USDOT registration required (hazmat requiring placards excluded)

“If you qualify as a commercial motor vehicle as defined by (49 CFR 390.5), the answer is YES. All commercial vehicles in Alabama must be marked with either an Interstate USDOT# or an Intrastate USDOT#.” source

“if you are an Intrastate company operating straight trucks and trucks with trailers having Gross Vehicle Weight Ratings (GVWR) or Gross Combination Weight Ratings (GCWR) of 26,000 pounds or less ... a USDOT# is NOT required.” source

The rule: Ala. Code § 32-9A-2(a)(1) (adopts 49 CFR Parts 382-387 and 390-399, which include USDOT registration in Part 390) and § 32-9A-2(b)(5) (intrastate exemption below 26,001 lb)

Who to ask: Alabama Law Enforcement Agency (ALEA), Highway Patrol, Motor Carrier Safety Unit

Safety rules for in-state trucks

Alabama makes it unlawful to operate a commercial motor vehicle in violation of the federal motor carrier safety regulations, adopting them as amended in the future, but exempts intrastate commercial motor vehicles below 26,001 lb unless they carry 16+ passengers or placarded hazardous materials. (Ala. Code § 32-9A-2(a)(1), (b)(5))

The statute's intrastate exemption line is 26,001 lb, not the federal 10,001 lb.
Intrastate farm vehicles over 26,000 lb within 150 miles of the farm are largely exempt, but drivers must be at least 18 and meet physical qualifications for combination vehicles.

The federal lines, which apply in Alabama 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 Alabama require a USDOT number for intrastate trucks?

Yes. Alabama requires a USDOT number for in-state commercial vehicles at 26,001 lb and over (GVWR or GCWR), even if they never cross a state line.

What is the CDL weight in Alabama?

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 Alabama?

Alabama Law Enforcement Agency (ALEA), Highway Patrol, Motor Carrier Safety Unit.

What we could not confirm

The statute sets the line at 26,001 pounds without saying whether it means the rating or the loaded weight; the state police pages use the rating (GVWR or GCWR). Ask ALEA if a truck rated under the line is loaded over it.
ALEA also says business vehicles over 10,000 lb are treated as commercial and can be inspected, even though they don't need a USDOT number for in-state work below 26,001 lb.

Sources

General information, not legal advice. It summarises Alabama’s published rules as read in September 2026; confirm with ALEA's Motor Carrier Safety Unit or FMCSA.