What 393.11N means in plain language
FMCSR 393.11N addresses a straightforward but critical requirement: your commercial motor vehicle must have functioning lighting devices and reflectors in the locations and configurations required by federal standards. This includes headlights, taillights, marker lights, reflectors, and any other lighting or reflective equipment your vehicle class requires.
When an inspector cites you for 393.11N, they've identified that one or more of these lighting or reflective components is either missing entirely or not working properly. The violation covers inadequate illumination, damaged lenses, burned-out bulbs that should have been replaced, reflectors that are cracked or missing, or improper positioning of lights. The citation doesn't distinguish between a completely missing light and one that functions partially—the standard is whether the device meets its specification.
This is a vehicle maintenance issue, not a driver conduct violation. It's your responsibility to ensure your vehicle is roadworthy before you operate it.
What our enforcement data actually shows
Across our 13 million inspection records, 393.11N appears as a relatively uncommon citation overall—ranked #887 of 3,036 FMCSR codes by volume. Since it was added or tracked in our database, we've recorded 545 total citations for this violation.
The out-of-service rate for 393.11N is 0.4%—meaning of every 250 citations issued, only 1 results in an immediate roadside out-of-service order. This is dramatically lower than the all-FMCSR average OOS rate of 31.4%, indicating that inspectors rarely deem lighting violations severe enough to remove a vehicle from service on the spot. Only 2 vehicles out of 545 cited have been placed out of service for this code.
In the last 90 days, we've seen 76 citations nationwide. Over the past 12 months, the volume is 343 citations, with activity relatively steady month-to-month. In our most recent data month (March 2026), 36 citations were issued; in May 2025, we recorded a higher peak of 40 citations.
Who gets cited most
Texas dominates the citation count for 393.11N. Our data shows 119 citations in Texas over the last 180 days, with zero out-of-service orders. New Mexico follows with 17 citations and a 0.0% OOS rate. Illinois rounds out the top three states with 8 citations, also with zero OOS placements.
All three top states have identical 0.0% OOS rates, meaning no material variation in enforcement severity across these jurisdictions. This suggests 393.11N citations are treated as defects requiring repair, not immediate safety grounds for roadside removal.
Among individual carriers in our all-time records, Rolando Villanueva Navarro (USDOT 559151) has accumulated 4 citations—the highest in our database. Our data shows fleets such as Ruben Carlos Trevino Sanchez (USDOT 1649689) and Servicio de Transporte Internacional y Local SA de CV (USDOT 557341) with 3 citations each. These carriers represent a wide geographic and operational spread; the citation patterns do not suggest systemic fleet negligence but rather scattered maintenance oversights across the industry.
How severe is this compared to similar codes
393.11N sits in the vehicle maintenance category alongside several other lighting and structural defect codes. Here's how the comparable codes rank in our inspection records:
393.9 (Inoperable Required Lamp) is the closest relative, with 180,097 citations and a 6.9% OOS rate—substantially higher than 393.11N's 0.4%. That code addresses lamps that are present but non-functional; it's cited far more frequently and generates more roadside removals.
393.78 (Windshield condition defective) has recorded 157,894 citations with only a 0.3% OOS rate—even lower than 393.11N. Windshield violations, like lighting violations, are typically correctable defects.
396.3(a)(1) (Inspection, repair and maintenance of parts and accessories) is a broader maintenance umbrella with 236,919 citations and a 45.3% OOS rate—substantially stricter enforcement, because that code flags systemic maintenance failures rather than individual component defects.
By this comparison, 393.11N is treated as a localized equipment defect, not a systemic safety failure warranting immediate out-of-service action.
How to avoid it
Our co-occurrence data shows which defects frequently appear alongside 393.11N in the same inspection, which tells us where to focus your pre-trip attention:
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Inspect all lamps and reflectors during pre-trip. Our records show 393.9 (inoperable required lamps) co-occurs with 393.11N in 26 shared inspections over the last 90 days. Walk around your vehicle with fresh eyes and a checklist: headlights (both high and low beam), taillights, brake lights, turn signals, marker lights on all sides, and reflectors. Test each one. Don't assume a light works because it worked yesterday.
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Check your windshield and lighting visibility. 393.78 co-occurs in 17 recent shared inspections. Cracks, dirt, or fogging in your windshield reduce your ability to see and operate lights safely. If you can't see clearly, neither can an inspector assessing your lighting compliance.
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Confirm light positioning and securing. Don't rely on duct tape, wire, or makeshift mounting. Lights must be securely mounted in their designed location. Freightliner vehicles (169 citations in our all-time data) and Kenworth units (74 citations) appear most frequently in 393.11N citations—not because those brands are defective, but because they're common in the fleets we inspect. Regardless of your make, ensure lights are properly affixed and aim correctly.
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Replace burnt bulbs and broken reflectors immediately. This is the most direct prevention step. Don't defer a burned-out marker light or cracked reflector to your next scheduled maintenance. Replace it before your next trip.
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Consider the broader electrical system. When 393.11N and 393.95A (emergency equipment defects) co-occur in 13 shared inspections, it often signals a vehicle with aging or neglected electrical systems. If you're seeing multiple lighting issues, have a mechanic audit your entire electrical and emergency equipment package.
Your citation is a notice to repair, not a conviction. Most 393.11N cases do not result in out-of-service orders because the defect is fixable. Get the lights and reflectors corrected, document the repair, and you move forward. The goal is to prevent a follow-up citation at your next inspection.