What 391.11B2-Z means in plain language
This citation is issued under the Driver Fitness category when a commercial motor vehicle driver operating in a border zone cannot demonstrate sufficient English language proficiency to meet federal standards. Specifically, the requirement under 391.11(b)(2) says that a driver must be able to read and speak English well enough to understand highway signs, respond to official inquiries, and communicate with the public during normal operations.
The "B2-Z" variant is tied directly to FMCSA Enforcement Guidance Memo MC-SEE-2025-0001, which governs how inspectors evaluate and document English proficiency deficiencies in border zone enforcement. In practice, this means an inspector at or near a border crossing assessed that you could not adequately respond to standard questions or read required signage in English.
This is not a mechanical violation—it is a qualification violation. The citation goes against you as a driver, not against your vehicle, and it attaches to your inspection record regardless of whether your truck was otherwise in perfect condition.
What our enforcement data actually shows
Across our database of 13 million+ inspections, 391.11B2-Z has generated 42,240 all-time citations, making it the #75 most-cited code out of 3,036 FMCSR codes. That is a significant enforcement footprint, and nearly all of it is extremely recent: 42,221 of those citations occurred in the last 12 months alone, meaning this code was essentially non-existent before mid-2025. The last 90 days alone account for 10,916 citations, confirming that enforcement activity is sustained and ongoing.
One number that should give you some relief: the out-of-service rate for this code is just 0.2%. Of 42,240 all-time citations, only 98 drivers were placed out of service. Compare that to the all-FMCSR average OOS rate of 31.4%—391.11B2-Z comes in dramatically below that baseline. That means in the overwhelming majority of cases—42,142 out of 42,240—drivers received the citation and continued operating.
The monthly trend data tells an important story about enforcement intensity. Our inspection records show the volume jumped from 828 citations in June 2025 to 4,478 in July 2025, and has stayed in the 4,000–5,000 range through early 2026. October 2025 hit the single-month peak at 5,171 citations. This is not a sporadically enforced rule—inspectors are applying it consistently and at high volume.
Who gets cited most
The geographic concentration of 391.11B2-Z citations is striking. In the last 180 days, the top three states by citation count were Texas with 10,199 citations, followed by Arizona with 518, and California with 321. Texas alone accounts for the vast majority of border-zone enforcement activity on this code, which aligns with the volume of cross-border commercial traffic through that state.
OOS rate variation across these states is worth noting. Texas produced 10,199 citations with a 0.1% OOS rate, and Arizona produced 518 citations with a 0.0% OOS rate. California, with 321 citations, showed a 0.3% OOS rate—still extremely low in absolute terms, but three times the Texas rate. New Mexico rounds out the border enforcement picture with 196 citations and a 0.0% OOS rate.
Our data shows fleets such as SERVICIO INTERNACIONAL DE ENLACE TERRESTRE SA DE CV (USDOT 818175) with 361 all-time citations and TRANSPORTES DE CARGA FEMA SA DE CV (USDOT 1175018) with 321 all-time citations appearing at the top of the carrier list. The pattern across the top carriers is consistent with cross-border Mexican carrier operations, which is exactly the enforcement context this code was designed to address.
How severe is this compared to similar codes
Within the Driver Fitness category, 391.11B2-Z sits in a complicated neighborhood. Consider 391.11B2-Q, a closely related English proficiency code also tied to MC-SEE-2025-0001—that code carries a 65.2% OOS rate across 23,688 citations. The B2-Z variant, by contrast, holds a 0.2% OOS rate across 42,240 citations. The difference in OOS rates between these two sibling codes is dramatic, and it reflects how inspectors are applying enforcement guidance: the B2-Z designation appears to capture a broader border-zone scenario where the proficiency gap is noted but not treated as immediately disqualifying.
Look further in the category and the contrast sharpens. The code 383.23A2-LCDLN—operating a CMV without a valid CDL—carries a 98.6% OOS rate across 47,123 citations. Similarly, 391.41APC, for operating without a valid medical certificate, sits at a 97.1% OOS rate across 49,539 citations. Those codes send nearly every cited driver to the side of the road. A 391.11B2-Z citation, at 0.2%, is in an entirely different enforcement tier by that measure.
How to avoid it
Because this is a qualification-based citation, your primary line of defense is demonstrating English proficiency when an inspector engages you. But our inspection records also reveal that 391.11B2-Z rarely shows up alone. The co-occurring violation data for the last 90 days shows it appearing alongside serious mechanical defects at high frequency—and that combination increases your inspection scrutiny and your risk of a more severe outcome.
- Practice your inspection-stop responses in English. Inspectors ask predictable questions: your name, origin, destination, commodity, and hours of service status. Rehearse clear, direct answers to these in English before every cross-border trip.
- Check your fuel system before departure. 396.5B-L (fuel system leak) appeared in 1,379 shared inspections with this code in the last 90 days, and 396.5B added another 681. A visible fuel leak draws immediate attention and escalates any stop into a full Level I.
- Walk your lights before you roll. Code 393.9 (inoperable required lamp) co-occurred in 1,297 shared inspections. Every inoperable lamp is a reason for an inspector to dig deeper. Verify marker lights, brake lights, and turn signals during pre-trip.
- Inspect your exhaust routing. Code 393.83G—exhaust discharging forward of or directly below the cab—appeared in 1,112 shared inspections. This is a straightforward visual check during pre-trip that can prevent a violation that compounds your record.
- Verify brake hardware, especially slack adjusters. Code 393.47E (defective slack adjuster) appeared 1,052 times alongside this citation. Slack adjusters are part of a standard pre-trip; feel for proper travel and look for visible damage.
- Inspect brake tubing and hoses. Code 393.45B2UV (brake tubing/hoses inadequate) co-occurred in 1,010 shared inspections. Look for abrasion, kinking, or improper routing on every pre-trip, particularly on Freightliner and International units—our data shows those makes account for the highest citation volume under this code.
- Clear your windshield completely. Codes 393.60C (glazing obstructions, 868 co-occurrences) and 393.78 (windshield condition, 758 co-occurrences) round out the list. Cracks, stickers, or mounted devices in the sweep area are easy inspector targets and easy pre-trip fixes.