What 383.21 means in plain language
FMCSR 383.21 prohibits operating a commercial motor vehicle while holding more than one valid driver license. This means you cannot have active licenses from multiple states or jurisdictions at the same time, even if they're all valid.
The regulation is straightforward: when you obtain a CDL or upgrade your driving privileges, you must surrender any other driver licenses you hold. If an inspector discovers you're carrying multiple licenses—whether they're in your wallet, your home, or on file with state motor vehicle departments—you're in violation.
This isn't about your driving skill or safety record. It's a licensing compliance issue. The FMCSA treats it as a fitness-to-drive matter because holding multiple licenses creates confusion about your true driving history, creates opportunities for hiding violations across jurisdictions, and complicates enforcement.
What our enforcement data actually shows
Across our 13 million+ inspection records, we've seen 811 citations for 383.21 since data collection began. In the last 12 months alone, enforcement officers issued 366 citations for this violation, with 80 citations in the last 90 days.
Here's the critical part: our data shows only 15 out of 811 inspections (1.8% OOS rate) resulted in a vehicle being placed out of service for this violation. That's dramatically lower than the all-FMCSR average OOS rate of 31.4%. In other words, when you're cited for 383.21, there's roughly a 98% chance you'll be allowed to continue driving after the citation is issued—this code is not eligible for immediate out-of-service action.
383.21 ranks #772 out of 3,036 FMCSR codes by citation volume, making it a relatively uncommon violation compared to high-volume issues like CDL class mismatches or missing medical certificates.
The enforcement trend over the past 12 months shows seasonal patterns. September 2025 saw the highest volume with 54 citations, while April 2026 dropped to just 2 citations (though that month's data is incomplete). Most months hover between 20–36 citations.
Who gets cited most
Our inspection data from the last 180 days shows Pennsylvania leads by far with 23 citations for 383.21, followed by Colorado and California, each with 15 citations. Washington state had 10 citations.
Across all of these top states, we recorded zero out-of-service placements. This consistency reinforces that 383.21 violations are uniformly handled as citations rather than immediate roadside removals.
Among carriers in our all-time database, KJ MEDELEZ LLC (USDOT 3901078) appears most frequently with 5 citations for this code. Several other carriers including A&D LOGISTICS INC, FEDERAL EXPRESS CORPORATION, SCHNEIDER NATIONAL CARRIERS INC, and USA TRUCK LLC each show 2 citations. Our data shows these fleets such as these have experienced the citation; this reflects the compliance challenges that can occur across any carrier size or type.
How severe is this compared to similar codes
To understand where 383.21 sits in the licensing and fitness category, compare it to related violations:
383.23(a)(2) — Operating a CMV in the wrong CDL class: This has 50,385 citations with a 98.4% OOS rate. Drivers cited for wrong class are almost certainly pulled from service immediately.
383.23A2-LCDLN — Operating a CMV without a valid CDL: 47,123 citations with a 98.6% OOS rate. This is the most serious licensing violation and results in immediate removal.
391.41(a) — Physical qualification (general): 42,270 citations with a 16.2% OOS rate. This medical/fitness code is more likely to result in OOS action than 383.21.
Your 383.21 citation, at 1.8% OOS, is among the least severe enforcement outcomes in the fitness-to-drive category. Regulators treat it as a paperwork/administrative issue rather than an immediate safety threat.
How to avoid it
The simplest rule: maintain only one valid driver license at a time.
Before you get a new license or CDL, contact your current state's motor vehicle department and confirm that your old license will be cancelled when your new one is issued. Many states do this automatically, but some require you to formally surrender the old one.
If you move states or change your primary residence, complete your license transfer in the new state before your old license expires. Do not let both remain active in your name.
Check your license status annually. Request a driving record from your state's DMV to confirm you show only one active license. This is especially important if you've moved, changed employers, or upgraded your CDL.
Our co-occurrence data shows that 383.21 frequently appears alongside 383.23A2-LCDLN (operating without a valid CDL, 20 shared inspections in the last 90 days). This pattern suggests that some drivers are confused about which license is current or valid. Keep your license documentation clear and up to date.
During roadside inspections, have your current license readily available and ensure no expired or invalid licenses are in your possession. Inspectors will ask for it; having the right one makes the stop quick.
If you've recently moved or updated your CDL, keep written confirmation from your state DMV that your old license has been surrendered or cancelled. This documentation can resolve a citation quickly if an inspector questions you about duplicate records.