What 392.2-SLLS1 means in plain language
This citation comes down to one thing: your commercial motor vehicle was recorded traveling above the posted speed limit by somewhere between one and five miles per hour. It also covers situations where an officer determines you were moving too fast given the road or weather conditions at the time, even if you were technically under the posted number.
The margin sounds small — a single mph over the limit qualifies — but federal motor carrier safety rules treat any speed in excess of what's posted as a violation. Enforcement officers at roadside have discretion to write this up whether they clock you at 56 in a 55 or 60 in a 55.
For drivers, the practical takeaway is straightforward: cruise control set a hair above the limit, or pushing pace slightly on a wet highway, is enough to generate this citation and start a paper trail in your safety record.
What our enforcement data actually shows
Across our 13 million+ inspection records, 392.2-SLLS1 has been cited 27,463 times all-time, making it the 101st most-cited code out of 3,036 FMCSR codes in our database. That's a significant enforcement presence — well inside the top 4% of all codes by volume.
The pace of enforcement has been accelerating sharply. Over the last 12 months alone, our inspection records show 17,590 citations, and 3,661 of those came in just the last 90 days. To put that in context, more than 64% of all all-time citations for this code were written in the past year.
The good news for drivers: the out-of-service risk here is effectively zero. All-time, only 10 vehicles were placed out of service across 27,463 citations — an OOS rate of 0.0%. The all-FMCSR average OOS rate across every code in our database is 31.4%. This code sits nowhere near that threshold. You will almost certainly keep rolling after a 392.2-SLLS1 citation, but the violation still lands in your CSA Unsafe Driving BASIC with a severity weight of 3, which means it does affect your safety score and, through it, your carrier's.
Looking at the monthly trend, citation volume has been consistently elevated. Our data shows monthly counts running between 1,218 and 1,948 citations from May 2025 through March 2026, with a peak of 1,948 in July 2025. That sustained volume tells fleet safety managers this is not a seasonal blip — enforcement attention on low-level speeding in CMVs is steady and widespread.
Who gets cited most
In the last 180 days, South Carolina leads all states with 1,995 citations and a 0.0% OOS rate. New Mexico comes in second with 1,454 citations, also at 0.0% OOS. Texas ranks third with 814 citations at 0.0% OOS. Oklahoma follows with 722 citations.
The OOS rates across the top states are nearly uniform at zero — Illinois is the only notable exception among the top ten, with 3 OOS placements out of 370 citations for a 0.8% rate. That's not a large absolute number, but fleet managers routing through Illinois should note it as the only state in the top ten where any OOS action occurred.
On the carrier side, our data shows fleets such as United Parcel Service Inc (USDOT 21800) with 143 citations and Federal Express Corporation (USDOT 86876) with 143 citations leading all carriers all-time. J B Hunt Transport Inc (USDOT 80806) follows with 90 citations. These are among the highest-volume carriers on the road, so citation counts reflect exposure as much as anything else — but the numbers do illustrate that no fleet size or operational profile is immune to this citation.
How severe is this compared to similar codes
Within the Unsafe Driving category, 392.2-SLLS1's 27,463 all-time citations look modest next to some close relatives. The peer code 392.2-SLLS2 — covering speeding 6-10 mph over the limit — has 72,337 citations in our database with a 0.0% OOS rate, nearly three times the volume of this code. That suggests enforcement officers write the higher-band speeding violation far more often, but the OOS outcome is identical: essentially zero for both.
Zoom out further and 392.2 — the broader unsafe driving code — has accumulated 1,208,164 citations with a 0.8% OOS rate. That's a code that generates an OOS placement roughly once every 125 inspections. By comparison, 392.2-SLLS1's all-time OOS rate rounds to zero — this code carries the lightest OOS risk of any peer in its category based on our data.
The code 392.2-SLLEQP carries a 2.4% OOS rate across 72,352 citations, which is the highest OOS rate among the peers shown in our database for this category. If your inspection surfaces multiple Unsafe Driving codes at once, the combinations matter far more than this code in isolation.
How to avoid it
The co-occurring code pattern in our data gives a clearer picture of the inspection environment that produces a 392.2-SLLS1 citation. In the last 90 days, 316 inspections that included this code also included code 392.2-SLLLR, and 95 inspections included 392.2-SLLSR and another 39 included 392.2-SLLUCR — all of which relate to driver condition and alertness. That co-occurrence pattern suggests inspectors writing up low-level speeding are also scrutinizing the driver closely for signs of fatigue or impairment. Arriving at a weigh station or checkpoint visibly tired or rushed makes every other violation more likely to be written.
Beyond driver condition, here are concrete actions before and during your trip:
- Set cruise control at or below the posted limit on every segment. A one-mph buffer above the limit is enough to generate this citation. Cruise at the limit, not at the limit plus two.
- Check your speedometer calibration during pre-trip. A miscalibrated gauge or non-spec tires can cause the truck to read slower than actual ground speed. If your odometer or GPS speed doesn't match the dash, flag it before dispatch.
- Verify all required lamps are operational before pulling out. Code 393.9 (inoperable required lamp) co-occurred with this violation in 95 inspections in the last 90 days. A burned marker or brake light invites a full Level I inspection where a speed violation is far more likely to be documented.
- Carry your current periodic inspection documentation. Code 396.17C-PI (no proof of periodic inspection) appeared in 118 shared inspections in the last 90 days. A missing inspection sticker escalates officer attention across every aspect of the inspection.
- Slow further for conditions, not just posted limits. This code explicitly covers speed too fast for conditions. Rain, construction zones, and heavy traffic all create exposure even when your speedometer shows the posted number.
- Check your medical certificate is current and on your person. Code 391.41APC co-occurred in 41 inspections alongside this citation in the last 90 days. An administrative paperwork issue found during a speed-triggered stop makes a bad day significantly worse.