What 390.21TA means in plain language
390.21TA is a general administrative citation related to vehicle identification and marking requirements under the Federal Motor Carrier Safety Regulations. This code addresses how your commercial motor vehicle must display required identification information that allows law enforcement and safety inspectors to quickly verify your carrier's registration and compliance status.
When an inspector or officer stops your vehicle, they need to be able to read and confirm specific markings from the outside of the truck. If those markings are missing, illegible, improperly placed, or don't match your actual carrier information, you can receive a 390.21TA citation. This is typically a paperwork and visibility issue rather than a mechanical or operational safety problem.
What our enforcement data actually shows
Across our database of 13 million+ roadside inspections, 390.21TA has generated 1,261 all-time citations, with 529 citations in the last 12 months and 122 citations in the last 90 days. This ranks the code #660 of 3,036 FMCSR codes by citation volume—a moderate enforcement frequency.
The critical number for your situation: zero out-of-service placements across all 1,261 citations, for a 0.0% OOS rate. This means no driver or vehicle has been pulled out of service for this violation. Compare this to the all-FMCSR average OOS rate of 31.4%—390.21TA is significantly less severe than the typical FMCSR violation. You will not be stopped from operating; the citation is issued and you proceed.
Enforcement has been steady over the past year. Our monthly data shows a range between 17 citations (April 2025) and 68 citations (May 2025), suggesting this violation is consistently enforced but not spiking sharply in any region or season.
Who gets cited most
Over the last 180 days, our data shows the states with the highest citation counts are:
- Illinois: 103 citations, 0.0% OOS rate
- Iowa: 72 citations, 0.0% OOS rate
- North Carolina: 60 citations, 0.0% OOS rate
OOS rates are uniform across these top states (all 0.0%), indicating the violation is treated consistently regardless of geography.
Among carriers, our records show fleets such as HAULDEX LLC (USDOT 4489350) with 6 citations and CASEY POTTER (USDOT 3145504) with 4 citations receiving the most citations for this code. These numbers reflect the typical volume for a lower-rank violation and do not imply systematic non-compliance—marking and identification issues occur across carrier sizes and types.
How severe is this compared to similar codes
390.21TA is part of a family of vehicle marking and identification regulations. In the same general/administrative category, peer codes show much higher citation volumes:
- 390.21TB2-DOT: 74,663 citations, 0.0% OOS rate
- 390.21T(b): 61,097 citations, 0.0% OOS rate
- 390.21TB1-MC: 59,189 citations, 0.0% OOS rate
390.21TA's 1,261 citations place it well below these peer codes. All three peer codes also carry 0.0% OOS rates, confirming that marking violations across this regulatory family are administrative in nature and do not result in vehicle removal from service. The lower citation count for 390.21TA suggests either more targeted enforcement or simpler compliance relative to its peers.
How to avoid it
Based on the violations most frequently cited alongside 390.21TA in the same roadside inspections, here are actionable steps:
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Pre-trip inspection of all exterior markings: Walk around your vehicle before each shift and confirm that your USDOT number, carrier name, and any required placards are clearly visible, not obscured by dirt, damage, or weather damage. Peer into areas where mud or salt spray accumulates. Look at markings from 20 feet away in daylight and again at night—if you cannot read them easily, an inspector will struggle too.
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Check your vehicle documentation matches the markings: Ensure the legal carrier name and USDOT number on your truck match your registration and operating authority. Mismatches between painted or decaled information and your paperwork trigger the citation.
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Monitor high-incident vehicle types: Our data shows Freightliner (FRHT) trucks account for 282 of all 390.21TA citations, followed by International (INTL) with 133 and Peterbilt (PTRB) with 120. If you operate one of these common makes, inspectors will be checking your markings with extra attention. Invest in cleaner, more visible marking or decaling if your vehicle is an older model prone to fading.
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Watch for fatigue and mechanical neglect: Our inspection records show that 392.2RG (Operating while ill or fatigued) is the most commonly co-occurring code with 390.21TA, appearing in 34 shared inspections in the last 90 days. Inspectors are more likely to cite marking defects when they also observe signs of driver fatigue or inattention to vehicle condition. Ensure you are well-rested and that your overall pre-trip inspection is thorough—an inspector who finds multiple issues will cite each one.
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Verify emergency equipment and lighting: The second and third most co-occurring codes are 396.17C (no proof of periodic inspection) and 393.9 (inoperable required lamp), each appearing 29 and 26 times respectively. A vehicle with missing proof of inspection or failed lights will receive closer scrutiny of all markings. Keep your inspection documentation current and fix any burned-out lamps immediately.
The good news: this citation does not stop your truck or end your day. It is a compliance notice that will require administrative follow-up with your carrier or the regulatory agency, but you will not be placed out of service. Focus on clean, accurate, visible markings and a well-maintained vehicle overall, and you will reduce your exposure to this and related administrative violations.