The short answer
Alabama trucks that never leave the state: the USDOT number with AL after it when it is 26,001 lbs or more, seats 16 or more or carries placard-level hazmat (except farm vehicles).
Alabama intrastate trucks at or over 26,001 lbs (or 16+ passengers, or placarded hazmat) follow the full federal marking rule, with the intrastate USDOT number shown with an AL suffix — e.g. USDOT 1234567 AL. Under 26,001 lbs and not hauling passengers or placarded hazmat, Alabama exempts you from the federal marking rules entirely. Farm vehicles within 150 air miles of the farm are exempt from USDOT marking.
Trucks that cross a state line, or haul freight that starts or ends in another state, follow the federal rule instead: the USDOT number and your legal name when it is 10,001 lbs or more, carries placard-level hazmat, seats 9 or more for hire or seats 16 or more (49 CFR 390.21T(b)(2)).
Rules verified against the primary sources 2026-07-28, next review 2027-01-24. The full citation list is on our USDOT decals in Alabama page and the 50-state rules table.
Nine Alabama trucks, run through the checker
Each verdict below is what our free compliance checker returns for that truck using the verified Alabama and federal rules. Where one changed fact flips the answer, we show the flip, because that is usually where Alabama carriers get caught.
1. A 9,000-lb plumber's cargo van on Birmingham service calls, Alabama only
9,000 lbs GVWR · own tools and parts · Alabama only
Not required
At 9,000 pounds it is under the 26,001-pound Alabama line and it carries general freight with no placard, so no verified Alabama or federal rule reaches it.
2. A pickup pulling an equipment trailer on landscaping jobs around Birmingham, Alabama only
20,000 lbs combined · own equipment · Alabama only
Not required
At 20,000 pounds it is under the 26,001-pound Alabama line and it carries general freight with no placard, so no verified Alabama or federal rule reaches it.
Flip one fact: The same rig takes one job in Georgia. It is now in interstate commerce, the federal rule applies from 10,001 pounds, and it needs the USDOT number and your legal name on both sides.
3. A 26,000-lb GVWR box truck delivering furniture for pay, Birmingham only
26,000 lbs GVWR · paid freight · Alabama only
Not required
At 26,000 pounds it is under the 26,001-pound Alabama line and it carries general freight with no placard, so no verified Alabama or federal rule reaches it.
Flip one fact: At 26,001 pounds, one pound more, the same truck needs the USDOT number with AL after it.
4. A 33,000-lb tandem dump truck for a Huntsville contractor, Alabama only
33,000 lbs GVWR · paid hauling · Alabama only
USDOT number required
The Alabama rule reaches this truck because it is 33,000 pounds, over the 26,001-pound line. The checker returns the USDOT number with AL after it, both sides. On the door that reads: USDOT 1234567 AL.
Flip one fact: Rated at 26,000 pounds, the same truck stays under the Alabama 26,001-pound line: at 26,000 pounds no verified Alabama rule reaches it.
5. A 40,000-lb grain truck on farm plates, Alabama only
40,000 lbs GVWR · farm vehicle · Alabama only
Not required
At 40,000 pounds it is under the 26,001-pound Alabama line, the Alabama farm exemption takes it out even at this weight and it carries general freight with no placard, so no verified Alabama or federal rule reaches it.
Flip one fact: Take it off the farm exemption, by plating or by use, and it is marked like any other truck at this weight: the USDOT number with AL after it.
6. A 15-passenger hotel shuttle van in Birmingham, no fare charged
15 seats including the driver · passengers, not for hire · 9,500 lbs GVWR · Alabama only
Not required
At 9,500 pounds it is under the 26,001-pound Alabama line and 15 seats is under the 16-passenger trigger, so no verified Alabama or federal rule reaches it.
Flip one fact: With 16 seats including the driver, the same van needs the USDOT number with AL after it.
7. A 12-passenger paid airport shuttle, Birmingham only
12 seats · passengers for pay · 9,500 lbs GVWR · Alabama only
Not required
At 9,500 pounds it is under the 26,001-pound Alabama line and 12 seats is under the 16-passenger trigger, so no verified Alabama or federal rule reaches it.
Flip one fact: The same shuttle takes one job in Georgia. It is now in interstate commerce, the federal rule applies from 10,001 pounds, and it needs the USDOT number and your legal name on both sides.
8. A 14,000-lb placarded propane bobtail, Alabama only
14,000 lbs GVWR · placard-level hazmat · Alabama only
USDOT number required
The Alabama rule reaches this truck because it carries placard-level hazmat. The checker returns the USDOT number with AL after it, both sides. On the door that reads: USDOT 1234567 AL.
Flip one fact: Haul non-placarded freight in the same truck and the hazmat trigger drops away: at 14,000 pounds no verified Alabama rule reaches it.
9. A hotshot pickup and gooseneck running Birmingham to Atlanta loads
26,000 lbs combined · paid freight · interstate
USDOT number required
Because it crosses state lines, the federal marking rule applies: it is 26,000 pounds, over the 10,001-pound line. The checker returns the USDOT number and your legal name, both sides. On the door that reads: USDOT 1234567 · Your Company LLC. Because it hauls for hire across state lines, the checker also lists the MC number as commonly displayed but not required.
Flip one fact: Keep the same rig inside Alabama and the federal rule drops away: at 26,000 pounds no verified Alabama rule reaches it.
The checker weighs rating, registered and actual weight, operation, for-hire status, cargo, passenger count and farm status. It does not model axle count or vehicle type, so if your truck is unusual, confirm with ALEA — Motor Carrier Safety Unit.
What goes on the door in Alabama
- One marking, both sides of the power unit: USDOT 1234567 AL, which is the USDOT number with AL after it.
- No inch minimum in Alabama. The legal standard is a color that contrasts with the truck and letters readable from 50 feet in daylight. We cut 2-inch letters, which clears that bar on any door.
- The AL after the number. Alabama's rule is written for trucks that stay in Alabama, and it reads USDOT 1234567 AL. The federal rule for trucks that cross state lines has no suffix, so a truck that does both is usually cut to the federal format; ask us if yours does.
Across the Alabama line
The Alabama line only matters while the truck stays home. One job in Georgia, or one load that starts or ends out of state, makes it interstate commerce, and the federal 10,001-pound rule applies no matter where either state draws its own line. For a truck that works near the border it helps to know how the neighbors differ for their own in-state trucks:
- Florida: 26,001 pounds.
- Georgia: the federal 10,001 pounds even in-state.
- Mississippi: 26,001 pounds.
- Tennessee: 26,001 pounds.
Neighbor lines come from the same verified rule files the checker uses; each state's page has its citations.
Who enforces it in Alabama
Door markings in Alabama are the business of ALEA — Motor Carrier Safety Unit. Questions about your registration or number: (334) 242-4395, agency site. The federal side, USDOT numbers and the MCS-150, is the FMCSA Alabama Division: (334) 290-4954, MCALOFF@dot.gov. A marking violation is written at the roadside and follows the carrier on the inspection report, which is why it is worth getting the two lines right the first time.
For the marking mistakes inspectors catch most often, see USDOT marking mistakes that fail roadside inspections.
Where the Alabama rule comes from
- Code of Alabama 32-9A-2(a) — no person may operate a CMV in Alabama in violation of the FMCSRs at 49 CFR Part 107, Parts 171-180, Part 380, Parts 382-387, and Parts 390-399 (Part 390…
- ALEA MCSU 'Intrastate Commercial Vehicle Regulations' PDF — 'Intrastate companies operating any vehicle with G.V.W.R. or G.C.W.R. of 26,001 pounds or more will be required to comply with all Federal Motor Carrier Safety…
- ALEA MCSU page — 'All commercial vehicles in Alabama must be marked with either an Interstate USDOT# or an Intrastate USDOT#.' Intrastate-only carriers are issued a USDOT…
- 49 CFR 390.21T — the federal marking rule for interstate carriers
Read in full and verified 2026-07-28; next scheduled review 2027-01-24.
Alabama USDOT number FAQ
Does a landscaper's pickup and equipment trailer at 20,000 lbs need a USDOT number in Alabama?
Not under the verified Alabama rule. At 20,000 pounds it is under the 26,001-pound Alabama line and it carries general freight with no placard, so no verified Alabama or federal rule reaches it. The same rig takes one job in Georgia. It is now in interstate commerce, the federal rule applies from 10,001 pounds, and it needs the USDOT number and your legal name on both sides.
Does a 26,000-lb box truck hauling for pay need a USDOT number in Alabama?
Not under the verified Alabama rule. At 26,000 pounds it is under the 26,001-pound Alabama line and it carries general freight with no placard, so no verified Alabama or federal rule reaches it. At 26,001 pounds, one pound more, the same truck needs the USDOT number with AL after it.
Does a 40,000-lb farm truck need a USDOT number in Alabama?
Not under the verified Alabama rule. At 40,000 pounds it is under the 26,001-pound Alabama line, the Alabama farm exemption takes it out even at this weight and it carries general freight with no placard, so no verified Alabama or federal rule reaches it. Take it off the farm exemption, by plating or by use, and it is marked like any other truck at this weight: the USDOT number with AL after it.
Does a 15-passenger van that charges no fare need a USDOT number in Alabama?
Not under the verified Alabama rule. At 9,500 pounds it is under the 26,001-pound Alabama line and 15 seats is under the 16-passenger trigger, so no verified Alabama or federal rule reaches it. With 16 seats including the driver, the same van needs the USDOT number with AL after it.
What exactly goes on the door in Alabama?
One marking, both sides of the power unit: USDOT 1234567 AL, which is the USDOT number with AL after it. No inch minimum in Alabama. The legal standard is a color that contrasts with the truck and letters readable from 50 feet in daylight. We cut 2-inch letters, which clears that bar on any door.
Get the Alabama markings cut to spec
USDOT Number Decals
Your USDOT number cut to the 50-foot standard — set of 2, both sides.
$16+Full Compliance Kit
Legal name + USDOT + MC + GVW, all cut to match.
$54.95+Alabama APSC Number Decal Set of 2
Cut to the Alabama rule above.
from $18.95USDOT Decals in Alabama
Every Alabama truck decal we cut, with the Alabama rule on one page.
from $16Not sure which truck above is yours? Run the free Alabama check, seven questions, sources cited. Rules for other states are in our intrastate USDOT guide and the 50-state rules table.
General information, not legal advice. Fleet Decal Depot is a decal maker, not a government agency. Rules change; confirm with ALEA — Motor Carrier Safety Unit and FMCSA before you operate.