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What California requires on a commercial truck

The short answer

Trucks based in California: California requires its carrier identification number displayed on both sides — but displaying your valid USDOT number satisfies the law (CVC 34507.5(f)(1)), and you must hold a USDOT number to get the CA number anyway. Industry practice (and our recommendation): display both lines — 'USDOT #######' over 'CA ######'. Triggers: trucks over 10,000 lbs, or hauling property for compensation at any weight. Exemptions include pickups in noncommercial/private light use, implements of husbandry, and historical vehicles (CVC 34507.5(e)).

Also in California: Legal / Trade Name (hauls for hire or 10,001 lbs or more).

Interstate trucks also follow the federal rule: name and USDOT number on both sides of the power unit from 10,001 lbs (49 CFR 390.21T(b)(2)); other triggers in the federal box below.

✓ Verified 2026-09-23 against the sources below · next review 2026-11-22

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The California rules in detail

USDOT Number

Required rule CA-NUMBER-DISPLAY

WhoTrucks based in California
When (any one of these)10,001 lbs or more · hauls property for hire
Exceptfarm vehicles
What goes on the truckUSDOT [your USDOT number]
Size and placementReadable from 50 feet in daylight, no inch minimum (we cut 2-inch number) · sharp contrast · both sides of the power unit

Legal sources

  • CVC 34507.5(a),(a)(1),(b),(f)(1),(g) — CA carriers must obtain a USDOT number FIRST, then a CA carrier identification number; the carrier ID number must be displayed both sides, sharp contrast, legible 50 ft daylight; per (f)(1) a vehicle displaying a valid USDOT number is exempt from the CA-number display requirement. Full section text read.

Verified 2026-09-23 · next review 2026-11-22

Legal / Trade Name

Required rule CA-NAME-DISPLAY

WhoTrucks based in California
When (any one of these)hauls for hire · 10,001 lbs or more
What goes on the truck[your company name]
Size and placementReadable from 50 feet in daylight, no inch minimum (we cut 3-inch name) · sharp contrast · both sides of the power unit

California requires the operator's name or trademark on both sides (CVC 27900). Bought a used truck? The previous company's name must be removed or covered within 60 days (CVC 27900(d)) — we can remove old markings and cut your new set in one visit.

Legal sources

  • CVC 27900(a) — vehicles carrying property or passengers for hire, trucks/truck tractors with 3+ axles, truck tractors with semitrailer, and all CMVs per 34601(c) must display the name or trademark of the operating authority on both sides. (d): prior owner's names must be removed or covered within 60 days of ownership change. Full section text read.

Verified 2026-09-23 · next review 2026-11-22

The federal baseline, the same in every state
  • USDOT Number + Legal / Trade Name, both sides of the power unit (49 CFR 390.21T(b)(2); 49 CFR 390.21T(b)(1))
  • Readable from 50 feet in daylight, no inch minimum · sharp contrast
  • MC Number: recommended, not required (49 CFR 390.21T)
  • Triggers: 10,001 lbs or more · placard-level hazmat · 9+ passengers for hire · 16+ passengers

Verified 2026-07-23 · next review 2026-10-21

Who enforces it in California

California DMV — Motor Carrier Permit Branch
Phone: (916) 657-8153
dmv.ca.gov

California truck marking FAQ

Which California trucks need a USDOT number on the door?

California requires it for: 10,001 lbs or more or hauls property for hire (except farm vehicles) (CVC 34507.5(a),(a)(1),(b),(f)(1),(g)).

Are farm trucks exempt in California?

USDOT Number: not required on farm vehicles.

Does it matter whether I haul for hire in California?

Yes. USDOT Number: 10,001 lbs or more or hauls property for hire (except farm vehicles). Legal / Trade Name: hauls for hire or 10,001 lbs or more.

Is the MC number required on trucks in California?

No California rule we verified adds it, and the federal rule recommends it without requiring it (49 CFR 390.21T).

Get exactly what California requires, cut to spec

USDOT decals for California

Full Compliance Kit

Standard $54.95

CA Number Decal for Truck Set of 2

from $16.00

Truck marking rules in other states

Florida · Georgia · Massachusetts · New Jersey · Ohio · Texas · Washington · West Virginia

All 50 states in one table →

General information, not legal advice. The agency above has the final word.