What 391.11B2S means in plain language
FMCSR 391.11B2S requires that you, as a commercial driver, must be able to understand highway traffic signs and signals in the English language. This is a straightforward requirement: when you're behind the wheel of a commercial vehicle, federal regulators expect you to comprehend the signs and signals you encounter on American roads.
This code is part of a broader set of driver fitness requirements. It's not about fluency in everyday conversation or paperwork—it's specifically about your ability to read and understand the visual information that keeps traffic flowing safely. A stop sign, a yield sign, a speed limit posted on a highway, a traffic light turning red: you need to know what these mean and act on them immediately.
The citation exists because language barriers create a safety risk. If a driver cannot quickly interpret directional signs, warning signs, or traffic control signals, they're more likely to make wrong-way movements, fail to slow down where required, or miss critical information that prevents crashes.
What our enforcement data actually shows
Across our 13 million inspection records, 391.11B2S is a relatively uncommon citation. We've recorded 71 citations all-time, with 33 issued in the last 12 months and 3 in the last 90 days. This code ranks #1519 out of 3,036 FMCSR codes by citation volume—meaning it's cited infrequently compared to major safety violations.
When inspectors do issue this citation, they rarely place drivers out of service. Our data shows a 14.1% out-of-service rate for 391.11B2S, significantly lower than the all-FMCSR average of 31.4%. Of 71 all-time citations, 10 resulted in an out-of-service order and 61 did not. This pattern suggests that in most cases, inspectors document the violation and issue a citation, but allow the driver to continue operating—often after determining that the language barrier is addressable or that communication was possible despite initial concerns.
In the last 90 days, we've seen citations spike in certain months. August 2025 had 7 citations with 3 out-of-service placements. September and November 2025 each saw 2 citations with 2 OOS orders. This indicates seasonal or regional variation in enforcement, not a sustained national trend.
Who gets cited most
Our inspection records show Illinois leading citations in the last 180 days with 4 cases, followed by North Carolina with 2. Both states show a 50.0% out-of-service rate, meaning half of citations in those states result in vehicle removal. This is notably higher than the national 14.1% rate for this code, suggesting that inspectors in these states apply stricter standards or that citations are issued only in more serious situations.
Among carriers with citations all-time, D2 LOGISTICS CORP (USDOT 2911574) appears twice. All other carriers in our database—including ERIVES ENTERPRISES INC, LEMBERG GROUP INC, and SELECT DEDICATED SOLUTIONS LLC—show single citations. No carrier has a pattern suggesting systemic issues with English language proficiency among their driver roster.
How severe is this compared to similar codes
When you compare 391.11B2S to other driver fitness requirements, the contrast is striking. Related codes like 383.23(a)(2) (CDL - wrong class) have 50,385 citations with a 98.4% out-of-service rate. Medical certificate violations (391.41APC) show 49,539 citations and 97.1% OOS rates. Operating without a valid CDL (383.23A2-LCDLN) has 47,123 citations and 98.6% OOS.
By comparison, 391.11B2S's 71 citations and 14.1% OOS rate place it in a much lighter enforcement zone. Even within the English language requirement category, the variant code 391.11B2-Q (a different proficiency standard) shows 23,688 citations and a 65.2% OOS rate—nearly 1,000 times more frequent and with much more severe consequences. This suggests 391.11B2S is either a narrow interpretation of the rule, applied only in specific border or inspection contexts, or enforced at a much lower frequency.
How to avoid it
Before every trip:
- Ensure you can read and verbally confirm your understanding of standard U.S. highway signs: speed limits, stop signs, yield signs, one-way markers, do-not-enter signs, and directional arrows. If English is not your first language, study a DMV sign guide or online resource specific to your state before renewing your CDL.
- If you use GPS or navigation apps, understand that these don't replace your ability to read physical roadside signage. Inspectors will test this directly during roadside checks.
During an inspection:
- When an inspector points to or asks about signs and signals, respond clearly and directly. If you don't understand a question, ask for clarification rather than guessing.
- Be aware that our data shows co-occurring citations with 391.11B2 (the related code requiring drivers to read and speak English sufficiently to respond to official inquiries). If language is flagged, communication with the inspector becomes critical—anything that compounds the initial concern (e.g., fatigue, shown in co-occurring codes 392.2C and 392.2W) will worsen your position.
General professionalism:
- Our records show Freightliner (24 citations), International (8), and Volvo (7) trucks represent the top vehicle makes cited for this code. This is likely due to their prevalence in the fleet, not a defect—but it suggests these vehicle types may be more frequently inspected in regions where language proficiency is screened.
- If you're operating in Illinois or North Carolina—the two states with the highest citation rates and highest OOS rates—be extra attentive. Inspectors in these states are more likely to apply this rule strictly.
The bottom line: this citation is uncommon and rarely results in being pulled off the road. But it's easy to prevent. If English is not your native language, invest time before hitting the road to ensure you can confidently identify and explain the meaning of standard traffic signs and signals.