What 392.2-SLL means in plain language
This citation comes down to one core judgment: an officer observed you operating a commercial motor vehicle in a condition — whether from fatigue, illness, or any similar impairment — where your ability or alertness was compromised enough to make continued operation unsafe. It doesn't require a crash. It doesn't require a blood test. The officer's on-scene assessment of your physical and mental state is the trigger.
Fatigue is the most common pathway to this citation. If you were visibly nodding off, had bloodshot eyes, slurred speech, or showed other signs consistent with extended duty without adequate rest, that observation alone can support a 392.2-SLL write-up. Illness works the same way — a fever, dizziness, or any condition that measurably reduces your responsiveness behind the wheel puts you in this code's territory.
The key word in the regulation is "unsafe." Officers aren't citing drivers for being merely tired after a long shift — they're making a judgment that your current state crosses the line into an active safety risk. That framing matters when you're deciding how to respond or whether to contest the citation.
What our enforcement data actually shows
Across our 13 million+ inspection records, 392.2-SLL has accumulated 84,501 all-time citations, placing it at #24 out of 3,036 FMCSR codes by citation volume. That's a top-1% enforcement footprint. In the last 12 months alone, our database recorded 53,873 citations under this code — and 11,002 of those came in just the last 90 days, showing no sign of enforcement tapering off.
The out-of-service picture is dramatically different from what you'd expect for a safety-weighted code. Of all 84,501 all-time citations, only 211 resulted in an out-of-service order — an OOS rate of 0.2%. Compare that to the all-FMCSR average OOS rate of 31.4%, and the gap is stark. Officers are writing this citation far more often than they're pulling drivers off the road for it. That said, 392.2-SLL is not OOS-eligible by default, which explains much of that spread — but it doesn't eliminate the CSA consequence.
In terms of CSA scoring, this code carries a severity weight of 8, which is on the high end of the scale. Even without an OOS order, a single citation like this moves the needle on your Unsafe Driving BASIC. Our monthly trend data shows volume has been consistently elevated: 5,264 citations in September 2025, 5,163 in July 2025, and 5,073 in March 2026, with only a partial month recorded in April 2026 at 273 citations. There's no slow season for this enforcement category.
Who gets cited most
Looking at our data from the last 180 days, California leads all states with 3,609 citations — and notably carries a 0.7% OOS rate, the highest among the top ten states. Kentucky comes in second at 3,287 citations with a 0.2% OOS rate, and Pennsylvania follows at 2,601 citations with a 0.1% OOS rate. If you run lanes through any of these states regularly, you're operating in the highest-volume enforcement zones for this code.
The OOS rate variation across the top states is worth noting. New Jersey logged 1,358 citations with an 0.8% OOS rate — the highest in the top ten — compared to Oregon, Minnesota, Nebraska, Virginia, and Washington, all of which recorded 0 OOS placements in the same period. That spread suggests meaningful differences in how individual enforcement agencies apply the OOS threshold when this code is cited.
Among carriers in our database, the citation counts for this code are substantial even at large-fleet scale. Our data shows fleets such as Federal Express Corporation (USDOT 86876) with 223 all-time citations and Western Express Inc (USDOT 511412) with 165 citations. High raw counts at high-volume carriers reflect fleet size and inspection exposure — not a per-driver rate — but they do confirm that no operation is exempt from this code.
How severe is this compared to similar codes
Within the Unsafe Driving category, 392.2-SLL sits in a cluster of related fatigue and impairment codes. The parent code, 392.2, has 1,208,164 all-time citations and an 0.8% OOS rate — making it the dominant enforcement vehicle in this family by a wide margin. At 84,501 citations, 392.2-SLL is a meaningful subset of that broader enforcement activity.
The closely related 392.2-SLLSR — also categorized as operating a CMV while ill or fatigued — has 191,232 all-time citations and an OOS rate of 0.1%, making it both more frequently cited and slightly lower OOS risk than 392.2-SLL's 0.2%. Meanwhile, 392.2-SLLEQP carries 72,352 all-time citations but a 2.4% OOS rate, which is twelve times higher than 392.2-SLL's rate. If your citation were under that code instead, the odds of being placed out of service would be substantially greater.
The positioning of 392.2-SLL — high citation volume, high severity weight, low OOS rate — means it functions primarily as a CSA scoring event rather than an immediate operational shutdown. That doesn't make it harmless, but it does tell you where the real consequence lands: on your safety record and your fleet's BASIC percentile.
How to avoid it
The co-occurring code pattern in our last-90-days data tells a specific story about what else is going wrong during inspections where 392.2-SLL gets written. Use that pattern to build your pre-trip and mid-trip checklist:
- Check your HOS records before you roll. Our data shows 507 shared inspections between 392.2-SLL and code 395.8A1-HOSP, which covers failing to maintain a proper record of duty status. If your logbook or ELD isn't in order, an officer already has a reason to scrutinize your fatigue state more closely.
- Have your medical certificate accessible. Code 391.41APC — operating without a valid medical certificate — appeared in 420 shared inspections with 392.2-SLL in the last 90 days. A missing or expired medical cert in the same stop as a fatigue observation is a compounding problem.
- Verify your periodic inspection documentation. Code 396.17C-PI (no proof of periodic inspection) appeared in 1,072 shared inspections, the highest co-occurrence after the 392.2-SLL family codes. An officer stopping a vehicle with no inspection paperwork is already in a more thorough inspection posture.
- Walk your tires before departure. Code 393.75A3-TAOL — tires leaking or significantly under-inflated — appeared in 444 shared inspections. Catching a tire issue pre-trip also signals to yourself that you're alert enough to do a real walk-around, not a perfunctory one.
- Be honest with yourself about your condition. The most effective prevention is the one the checklist can't enforce: if you genuinely feel impaired by fatigue or illness before a run, stopping is the right call. A voluntary delay is always cheaper than a CSA severity-weight-8 citation on your record.
- Freightliner and Ford chassis drivers, take note. FRHT leads all vehicle makes with 10,411 all-time citations under this code, followed by FREIGHTLIN at 9,369 and FORD at 6,773. These are high-volume platforms in the fleet — if you're running one, you're in the most-cited equipment group, which makes an airtight pre-trip even more important.