What 391.41A means in plain language
FMCSR 391.41A is the foundational physical qualification rule for commercial motor vehicle drivers. At its core, the regulation requires that anyone operating a CMV must meet a defined set of physical and medical standards before they can legally sit behind the wheel. If an inspector determines you do not satisfy those requirements, 391.41A is the code they write.
The standard covers a broad range of physical conditions — vision, hearing, blood pressure, neurological function, and more — all tied to whether a driver can safely control a large commercial vehicle. It is not a paperwork rule; it goes to whether your body currently meets the federal threshold for operating a CMV at all.
In practice, this citation often surfaces when a driver's medical certificate has lapsed, when a medical examiner's findings are in question, or when a condition has emerged that would disqualify a driver under the physical standards. If you were cited at roadside, the inspector concluded — based on documentation reviewed or observations made — that you did not meet those qualifications at the time of the stop.
What our enforcement data actually shows
Across our database of 13 million+ inspections, 391.41A has accumulated 11,387 all-time citations, placing it at #207 out of 3,036 FMCSR codes by citation volume. That is a meaningful enforcement footprint — this is not an obscure or rarely-used code.
The out-of-service picture is striking. Of those 11,387 citations, 5,654 resulted in a driver being placed out of service — an all-time OOS rate of 49.7%. To put that in context, the all-FMCSR average OOS rate across all codes is 31.4%. At 49.7%, this code runs nearly 18 percentage points above that average, meaning inspectors are placing drivers OOS at a significantly elevated rate when 391.41A is written.
It is worth noting that the code is technically listed as OOS-ineligible at the federal level, yet our inspection records show 5,654 historical OOS outcomes attached to it — a gap that likely reflects inspectors citing this code alongside conditions or companion violations that do trigger OOS authority. That real-world outcome rate is what drivers should focus on, not just the technical eligibility designation.
Enforcement volume has remained steady. Our records show 2,481 citations in the last 12 months and 418 citations in just the last 90 days. Looking at the monthly trend, May 2025 stood out with 429 citations and 349 OOS outcomes in a single month — the highest single-month total in the trailing year. Activity has since moderated but remains consistent, with recent months running between 165 and 208 citations per month.
Who gets cited most
State-level data from the last 180 days reveals a heavily concentrated enforcement pattern. Iowa leads all states with 409 citations, and the OOS rate there is severe: 400 of those 409 inspections resulted in an OOS outcome, a 97.8% rate. Illinois follows with 206 citations and a 72.8% OOS rate. North Carolina comes in third with 168 citations and an 86.3% OOS rate.
The variation across those three states is material. Iowa's 97.8% OOS rate is 25 percentage points higher than Illinois's 72.8% rate, and North Carolina's 86.3% sits between them. If you operate in Iowa, the data in our database indicates that a 391.41A citation almost certainly ends your day on the side of the road.
New Mexico also appears in the top state data with 107 citations and a 73.8% OOS rate, reinforcing that this code is actively enforced across geographically diverse corridors.
Among carriers in our all-time records, our data shows fleets such as Federal Express Corporation (USDOT 86876) with 26 citations and JMEJ Trucking LLC (USDOT 4315208) with 17 citations appearing at the top of the citation count list. These numbers reflect scale and inspection exposure across large fleets and active operations, not a judgment on any carrier's safety practices.
How severe is this compared to similar codes
Driver Fitness is a densely enforced category, and placing 391.41A alongside its peers reveals how enforcement weight is distributed.
383.23(a)(2) — CDL wrong class has 50,385 all-time citations and a 98.4% OOS rate — more than four times the citation volume of 391.41A, and an OOS rate that is nearly automatic. If you are driving the wrong class of vehicle for your license, you are almost certainly going OOS.
391.41APC — operating a property-carrying vehicle without a valid medical certificate in possession or on file has 49,539 citations and a 97.1% OOS rate. This peer code is closely related to 391.41A and shows that medical certificate paperwork failures are among the most frequently cited and most severely enforced driver fitness violations in the system.
391.41(a) — physical qualification general (a related but distinct code) carries 42,270 citations with a 16.2% OOS rate — notably lower than the 49.7% rate attached to 391.41A. Our inspection records suggest that how an inspector codes a physical qualification finding affects the downstream OOS outcome, making the specific code written at roadside consequential.
How to avoid it
The co-occurring violation data from the last 90 days tells a clear story: drivers cited for 391.41A are often dealing with multiple compliance gaps at the same time. Here is what the pattern implies for prevention:
- Carry your current medical certificate at all times. With 391.41APC appearing as a closely related peer code and medical certificate violations dominating the Driver Fitness category, an expired or missing medical card is the most direct trigger. Check the expiration date before every trip.
- Verify your medical card is filed with your state licensing agency if required. A certificate you are holding but that has not been submitted where required still generates a citation.
- Complete a thorough pre-trip inspection and address any equipment deficiencies before departure. Our inspection data shows that 396.17C (no proof of periodic inspection) co-occurred in 104 of the last 90 days' shared inspections — inspectors who find one gap look harder for others.
- Do not drive if you are ill or fatigued. Code 392.2RG (operating while ill or fatigued) appeared in 79 shared inspections in the last 90 days. A driver who appears impaired draws scrutiny of every document in the cab, including medical qualification paperwork.
- Check that your CDL is current and appropriate for the vehicle you are operating. Code 383.23A2 (operating without a CDL) appeared in 76 shared inspections. Missing or invalid licensing and missing medical qualification documents tend to travel together.
- Inspect emergency equipment before departure. 393.95A (fire extinguisher missing or defective) showed up in 60 shared inspections in the same 90-day window. A truck with missing safety equipment signals a maintenance culture that inspectors probe aggressively.
- Ford and Freightliner vehicles account for 1,829 and 1,729 all-time citations respectively under this code — not because of the vehicle itself, but because these are the most common platforms on the road. Whatever you drive, the pre-trip habits above apply equally.