Washington State DOT Number Requirements: Doors, Signs and Weight

Washington state DOT number requirements set the intrastate line at 16,001 pounds. Washington DOL says commercial motor vehicles with a GVWR of 16,001 pounds or more must get a USDOT number and display it (Washington DOL). The Washington State Patrol (WSP) tells carriers to show the legal business name and USDOT plus the number on the driver's side and passenger's side doors (WSP guide). WSP also says removable magnet signs are allowed.

What the State Patrol guide asks for

WSP's vehicle marking guide lists the pieces: the legal business name, the word USDOT with the number, both doors, a contrasting color, and lettering readable from at least 50 feet when the vehicle is stopped. It also says WAC 446-65-010 adopts the federal marking rule, 49 CFR 390.21T, for intrastate and interstate carriers (WSP guide).

So the text behind Washington's marking is the federal text, 49 CFR 390.21. Our display rules page explains it in plain words.

A made-up example: Cascade Aggregates LLC, USDOT 1234567. Each door carries the same two lines:

• CASCADE AGGREGATES LLC
• USDOT 1234567

If your truck has no door that carries a decal well, such as a flatbed with a small cab, ask WSP where it wants the marking. The guide speaks of doors, and we will not guess past it.

Removable signs: when they fit

WSP's guide allows removable (magnet) signs. The federal rule lets a removable device stand in for paint if it is on both sides, contrasts sharply, reads from 50 feet in daylight while stopped and is kept legible (49 CFR 390.21). FMCSA has also said carriers who use personal pickups for business can put on temporary signs and take them off when necessary (Federal Register).

That suits a pickup used for family trips on weekends and jobs on weekdays: the signs go on for work and come off after. Two cautions. A sign left in the cab marks nothing, and both doors need one every time the truck is working.

We sell adhesive vinyl decals, not magnets. Our magnetic signs guide helps you choose, and an adhesive decal is the simpler pick for a truck that stays with one name.

The 16,001 pound line, and trailers

DOL's page lists intrastate commercial motor vehicles with a GVWR of 16,001 pounds or more. It also lists combinations that include a towed unit of 10,001 pounds GVWR or more and total 16,001 pounds GVWR or more (Washington DOL). Both conditions go together.

Worked example, with made-up ratings. A truck rated at 8,000 pounds pulls a trailer rated at 12,000. The total is 20,000 and the towed unit is rated above 10,001, so that is the kind of combination the page describes. The same truck with a 6,000 pound trailer totals 14,000, and the towed unit is under 10,001, so that line does not fit. Read ratings from each vehicle's manufacturer label, and ask DOL about close calls.

Do not stop at 16,001 if the truck crosses the state line. Federal rules start at 10,001 pounds for vehicles used in interstate commerce (49 CFR 390.5T).

Getting and looking up the number

The USDOT number is applied for in FMCSA's Motus system at motus.dot.gov (FMCSA). Our guide to getting a USDOT number lists the steps. To check an existing record, the free SAFER Company Snapshot searches by DOT number, MC or MX number or company name. We did not verify any Washington step beyond the federal registration, so ask DOL.

Questions for WSP or DOL

1. Does the combination line cover my truck and trailer ratings?
2. If I use removable signs, does Washington expect anything beyond the federal conditions?
3. If my body style leaves no good door space, where should the marking go?
4. Is anything else expected on the truck beyond name, USDOT and the number?

Keep the answers with the truck's paperwork.

Ordering for a Washington truck

The USDOT Decal Sticker is $18.99 per decal, and the Company Name + USDOT decal is $27.99 with the name over the number. Pick the Set of 2 option to get one decal per door. If you also run interstate authority, the USDOT + MC two-line decal adds an MC line. See how it sits on a truck door in the door builder. Other states differ, as USDOT number requirements by state shows. Washington can update its guidance, so check the WSP and DOL pages again before a large order.