What 392.2DIB means in plain language
FMCSR 392.2DIB prohibits you from operating a commercial motor vehicle when your physical or mental condition is impaired to the point that it's unsafe. This includes fatigue, illness, medication side effects, or any other cause that reduces your ability to drive safely.
The regulation doesn't require you to be visibly sick or admitted to a hospital. An inspector may cite this violation based on observable signs: drooping eyelids, slurred speech, inability to follow instructions clearly, swerving between lanes, or admissions that you haven't slept adequately. The standard is straightforward: if your condition makes safe operation impossible or seriously compromised, you shouldn't be behind the wheel.
This is different from hours-of-service violations. You can be in compliance with HOS rules and still be cited for 392.2DIB if an officer observes that fatigue or illness is impairing your driving right now.
What our enforcement data actually shows
Across our 13 million+ inspection records, 392.2DIB has been cited 409 times all-time, with 253 citations in the last 12 months and 60 in the last 90 days. This places it at rank #986 out of 3,036 FMCSR codes by citation volume—not among the most frequent violations, but a serious enough issue that roadside inspectors are trained to recognize and document it.
What stands out immediately: the out-of-service rate for 392.2DIB is 0.0%. Of all 409 citations in our database, none resulted in the driver being placed out of service. This contrasts sharply with the all-FMCSR average OOS rate of 31.4%. In practical terms, inspectors cite this violation but do not typically remove you from service on the spot. However, this does not mean the violation is minor—it still carries a CSA Severity Weight of 8, which influences your safety profile.
Monthly trends over the past year show enforcement clustering in warmer months. Our data indicates 27–30 citations per month from May through August 2025, declining to 1–7 citations in April and November 2025. This pattern may reflect increased roadside operations during peak shipping seasons and summer travel.
Who gets cited most
Our inspection records show the top three states for 392.2DIB citations in the last 180 days are:
- New York – 16 citations, 0.0% OOS rate
- Pennsylvania – 15 citations, 0.0% OOS rate
- Georgia – 15 citations, 0.0% OOS rate
OOS rates are uniform across all major citing states at 0.0%, so geography does not appear to affect the likelihood of immediate removal from service. However, New York's higher citation count reflects its major role in interstate commerce corridors.
At the carrier level, our data shows fleets such as New Prime Inc with 5 citations for this code over our all-time records. Crete Carrier Corporation follows with 3 citations. These represent the upper end among carriers—most carriers have zero or one citation for 392.2DIB—but they illustrate that even larger, well-known fleets encounter enforcement for driver fatigue and illness.
How severe is this compared to similar codes
The 392.2 family of violations all address operating while ill or fatigued. Comparing 392.2DIB to closely related codes shows significant differences in enforcement volume:
- 392.2 (parent code, all variants combined) has 1,208,164 citations with a 0.8% OOS rate, making it one of the most-cited violation families in trucking.
- 392.2-SLLSR has 191,232 citations at 0.1% OOS rate, approximately 467 times more frequent than 392.2DIB.
- 392.2-SLLTCD has 85,391 citations at 0.0% OOS rate, also far more common.
392.2DIB is a specific variant within this family. Its lower citation count does not mean it is less serious—it may reflect a narrower set of circumstances or more stringent evidentiary requirements that inspectors apply before issuing this particular code versus other 392.2 designations.
How to avoid it
Inspectors and your carrier's safety team can help you stay compliant. Here are concrete actions:
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Know your sleep baseline. Before each shift, ensure you have had adequate rest. Many citations occur when drivers attempt to push through fatigue. If you feel drowsy, unsafe, or impaired in any way, communicate with dispatch immediately. Do not operate.
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Manage illness proactively. Fever, heavy cold medication, certain over-the-counter drugs, and prescription medications can all impair alertness. If you are taking any medication that warns against operating machinery, do not drive until the effect wears off or your doctor confirms safety. Keep records of when you started medication so you can explain your condition to an inspector if asked.
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Pre-trip checks include self-assessment. Our data on co-occurring violations shows that 392.2DIB inspections often occur alongside HOS violations and medical certificate issues. This suggests that fatigue citations often emerge during routine safety audits. Before every shift, do a 30-second self-check: Are your eyes clear? Can you concentrate? Is any illness present? If the answer to any is "no," do not start your route.
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Inspect your vehicle thoroughly, especially if you're tired. Our data shows Freightliner, Volvo, and Kenworth vehicles are cited most frequently (98, 35, and 22 times respectively). While vehicle brand doesn't cause fatigue, a well-maintained truck is less distracting to operate. A failing air suspension, loose steering, or brake issues force you to concentrate harder, accelerating mental fatigue on long hauls. Stay on top of periodic maintenance.
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Communicate with your company about scheduling. If your route planning leaves no margin for adequate rest, talk to dispatch. Many carriers now use fatigue management software and flexible scheduling to avoid putting drivers in a position where fatigue becomes inevitable.
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Understand the line between HOS compliance and safety. You can legally be awake and on duty within HOS limits but still be unsafe to drive due to fatigue or illness. This is the gap 392.2DIB targets. Staying within HOS hours is necessary but not sufficient—your actual physical state matters just as much.