What 392.2-SLML means in plain language
FMCSR 392.2-SLML addresses a fundamental safety issue: a driver whose ability to operate safely is compromised by fatigue, illness, or any other physical or mental condition should not be behind the wheel of a commercial motor vehicle.
This isn't about minor discomfort or a cold you can push through. The regulation focuses on situations where your condition—whether exhaustion, illness, medication effects, or injury—reaches a level that materially impacts your alertness, reaction time, or judgment. An inspector citing you for this violation made a roadside determination that your state at that moment made it unsafe for you to continue operating.
The citation reflects the FMCSR's core principle: a CMV on public roads carries real risk to you, your cargo, and everyone around you. When fatigue or illness crosses the line from manageable to unsafe, federal law requires you to stop.
What our enforcement data actually shows
Our inspection records show 392.2-SLML has been cited 1,559 times across our database of 13 million roadside inspections. In the last 90 days and the last 12 months, we recorded zero citations for this specific code variant—a signal that either enforcement is very selective or this particular code form is rarely applied.
What stands out most: of those 1,559 all-time citations, zero drivers were placed out of service. That means a 0.0% out-of-service rate. By contrast, the all-FMCSR average out-of-service rate is 31.4%. This suggests that when officers cite 392.2-SLML, they typically allow the driver to continue after the violation is noted—perhaps after a brief rest period or other remedial action short of an OOS order.
Nationally, 392.2-SLML ranks #589 out of 3,036 FMCSR codes by citation volume. It's a real enforcement issue, but far less common than major categories like brake defects or logbook violations.
Who gets cited most
Our data shows that large, established carriers including J B HUNT TRANSPORT INC (9 citations) and WERNER ENTERPRISES INC (9 citations) have drivers cited under this code. WESTERN EXPRESS INC follows with 7 citations. This reflects the reality that violation distribution tracks roughly with fleet size and miles operated: bigger fleets see more citations across most categories.
We do not have top-state data in our current sample, so we cannot name the states where 392.2-SLML citations concentrate most heavily. What we can confirm is that the citation volume is distributed across the carrier base, with no single fleet showing an outlier pattern that would suggest systemic fatigue or illness management problems.
How severe is this compared to similar codes
392.2-SLML sits within a family of operating-while-fatigued or ill violations. Here's how it compares:
392.2 (the parent code, same violation title) has logged 1,208,164 citations with a 0.8% out-of-service rate. That massive volume dwarfs 392.2-SLML's 1,559 citations, and its slightly higher OOS rate suggests more enforcement pressure or stricter roadside outcomes.
392.2-SLLSR has 191,232 citations and a 0.1% out-of-service rate, indicating far lighter OOS enforcement despite much higher citation frequency.
392.2-SLLEQP is noteworthy: it has 72,352 citations but a 2.4% out-of-service rate—significantly higher than 392.2-SLML's 0.0%. This suggests that certain code variants or enforcement contexts lead to more stringent roadside actions.
In short: 392.2-SLML citations exist but are rare, and they almost never result in an immediate out-of-service order.
How to avoid it
Before you start your shift:
- Be honest about your sleep. If you got fewer than 6 hours or slept poorly, build in rest time or call dispatch to delay your start. Fatigue clouds judgment; you're more likely to underestimate your own impairment.
- Take your health seriously. If you're running a fever, experiencing severe congestion, taking medication that causes drowsiness, or recovering from injury, inform your carrier. A day off now beats a citation and safety risk later.
- Check your logbook and know your available driving hours. Fatigue often creeps up when you're pushing toward a deadline. Stop before you feel it.
During your drive:
- Recognize the early signs: difficulty keeping your eyes open, drifting between lanes, delayed reaction to traffic, or struggling to focus on the road. These are your cue to find a safe place to stop, not a reason to push harder.
- Use rest stops every 2 hours. A 15-minute nap or walk breaks the fatigue cycle and resets your alertness.
- Never mask fatigue with energy drinks or stimulants alone. They can trick you into thinking you're more alert than you are.
- If illness develops during your shift—sudden nausea, dizziness, severe pain, or confusion—pull over immediately and contact dispatch. Your safety and the public's safety outweigh schedule pressure.
Fleet and carrier side (for safety managers):
- Build fatigue detection into driver coaching. Train dispatch to recognize when a driver sounds tired on the radio and empower them to suggest a rest stop.
- Monitor pre-trip reports for driver comments about illness or fatigue, and respond with supportive policies, not penalties for reporting.
- Audit your scheduling to ensure drivers have adequate turnaround time between loads.
The bottom line: 392.2-SLML citations are uncommon, but they exist because driver fatigue and illness are real safety hazards. Your best defense is self-awareness and a willingness to pause your trip when your condition is compromised.