What 390.21TG2 means in plain language
390.21TG2 is an administrative citation related to vehicle identification and marking requirements under FMCSR Part 390. This code addresses how your commercial vehicle must display certain identification information that allows roadside inspectors and law enforcement to quickly verify your operating authority and vehicle registration status.
The regulation requires that specific markings, numbers, or decals be properly affixed to your vehicle in locations and formats that meet federal standards. If an inspector cannot locate, read, or verify these markings during a roadside stop, you can receive a citation even if the underlying registration and authority are valid. It's a documentation and visibility issue, not a safety defect.
What our enforcement data actually shows
Across our 13 million+ inspection records, 390.21TG2 is extremely rare. We've recorded only 8 citations in our entire database, with zero citations in the last 12 months and zero in the last 90 days. This ranks 390.21TG2 at #2269 out of 3,036 FMCSR codes by citation volume—placing it in the bottom tier of enforcement priorities.
None of the 8 citations resulted in an out-of-service order, giving this code a 0.0% out-of-service rate. For perspective, the all-FMCSR average out-of-service rate is 31.4%, meaning 390.21TG2 citations almost never escalate to vehicle impoundment or service withdrawal. Inspectors typically issue this citation as a correctable violation rather than a safety-critical defect.
Who gets cited most
Our inspection records do not provide sufficient state-level distribution to identify top states by citation count for this code. The eight citations are distributed across multiple carriers, each with only one citation: Gulf Winds International Inc, LDT Transport Inc, Southern Intermodal Xpress LLC, Kamu Transport Inc, Johal Logistic Inc, Munkhbat Tuumuu, J A C Solution Inc, and Black Diamond Logistics Inc. This wide distribution suggests 390.21TG2 is not a systemic compliance issue for any particular fleet or region.
Vehicle makes cited include Freightliner (4 citations), Hyster (3 citations), and Kenworth (3 citations), along with trailers and other equipment. The pattern does not point to a specific vehicle type being more prone to this violation.
How severe is this compared to similar codes
390.21TG2 sits within a family of vehicle identification and marking regulations. Our data shows that related codes generate far higher citation volumes: 390.21TB2-DOT has 74,663 citations, 390.21T(b) has 61,097 citations, and 390.21TB1-MC has 59,189 citations. All of these peer codes maintain a 0.0% out-of-service rate, matching 390.21TG2's enforcement posture.
The dramatic difference in volume—390.21TG2 at 8 citations versus 390.21TB2-DOT at 74,663—indicates that 390.21TG2 enforcement is either highly targeted, involves a very specific marking requirement, or reflects a technical distinction that inspectors encounter rarely. In all cases, the 0.0% out-of-service rate across this code family signals that these are administrative corrections rather than safety-critical violations.
How to avoid it
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Check vehicle markings before each trip. Walk around your tractor and trailer to confirm that all required identification numbers, USDOT number decals, and carrier markings are visible, legible, and properly affixed. Do not assume markings applied at the depot remain intact after weeks on the road.
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Know where markings must appear. Review your carrier's safety manual or ask your dispatcher which specific locations and formats are required by your operating certificate. Markings in the wrong location or faded beyond legibility can trigger a citation even if they exist.
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Replace damaged or faded decals immediately. If you notice peeling, fading, or missing decals during your pre-trip, report it to maintenance or your dispatcher before rolling. Do not delay repairs hoping it will pass inspection.
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Ensure mud and dirt don't obscure markings. Wash your vehicle regularly, especially the areas where decals and identification must be visible. Road grime and mud accumulation can make otherwise compliant markings unreadable to an inspector.
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Document your markings. Take photos of all required identification during your vehicle assignment or after any maintenance. This creates a record if a citation is issued and you need to prove the marking was present and compliant at the time of citation.