What 390.21(e) means in plain language
FMCSR 390.21(e) concerns the display and maintenance of required markings on your commercial vehicle. Specifically, this regulation requires that certain identification information be displayed on your truck in a way that is legible, properly positioned, and not obscured. The regulation applies to lettering, numbers, and other identifying marks that must be visible to inspectors and law enforcement.
When an officer cites you for 390.21(e), they are saying that required markings on your vehicle did not meet the standard for legibility or visibility—whether because of fading, obstruction, damage, or improper placement. This is an administrative violation; it does not automatically place your vehicle out of service, but it does require correction.
What our enforcement data actually shows
Across our 13 million+ inspection records, 390.21(e) has been cited 738 times all-time, with 43 citations in the last 12 months and 6 in the last 90 days. Our data shows a 0.0% out-of-service rate for this code—meaning no vehicle has been placed out of service for a 390.21(e) violation. This is significantly lower than the all-FMCSR average OOS rate of 31.4%, indicating that inspectors and carriers treat this as a correctable, non-critical finding.
Ranked #798 of 3,036 FMCSR codes by citation volume, 390.21(e) is relatively uncommon. The trend over the past 12 months has been steady but low, with monthly citation counts ranging from 1 to 6. The lack of any out-of-service placements suggests that once cited, the fix is straightforward and typically does not require the vehicle to be taken off the road immediately.
Who gets cited most
Our inspection records show that Texas leads with 16 citations over the last 180 days, followed by North Carolina with 2 citations and New Mexico with 1 citation. All three states have a 0.0% out-of-service rate, consistent with the national pattern for this code.
Among carriers, our data shows fleets such as Image First Healthcare Laundry Specialists LLC with 6 all-time citations and Nebraskaland Inc with 5 citations. These numbers reflect volume and exposure rather than a pattern of systemic non-compliance; the zero out-of-service rate across all carriers cited for 390.21(e) indicates that the violation is correctable and does not indicate safety risk.
How severe is this compared to similar codes
Within the General/Admin category, 390.21(e) is far less cited than related codes. For example, 390.21TB2-DOT has 74,663 citations with a 0.0% OOS rate, and 390.21T(b) has 61,097 citations also at 0.0% OOS. The code 390.21(b), which addresses USDOT number display, has 13,244 citations and a 0.0% OOS rate. All of these peer codes share the same non-critical OOS treatment as 390.21(e), meaning marking and identification violations are treated uniformly as administrative issues rather than safety hazards.
How to avoid it
Before every trip:
- Walk around your entire vehicle and inspect all required markings—USDOT number, MC number, carrier name, and any placards. Look for fading, peeling paint, or dirt obscuring the letters or numbers.
- Ensure no cargo or equipment is blocking any required marking. Our data shows that marking obstruction by load is a co-occurring issue; keep your load clear of all identification.
- Check that lettering is the correct color contrast and size. If you notice fading or wear, plan for repainting or replacement before the next inspection.
During your operation:
- Keep your vehicle clean. Dirt and grime can obscure markings and trigger a citation even if the underlying paint is sound.
- Avoid loading or securing cargo in a way that covers any side or rear marking. We see instances where improperly positioned loads hide required identification.
- After any accident, repair, or repainting, verify that all required markings are restored to full legibility and proper position.
Because 390.21(e) citations carry zero out-of-service risk and are driven by simple visibility issues, your best defense is a pre-trip routine that includes a close visual inspection of all markings and a commitment to keeping your vehicle clean and your cargo properly secured.