What 393.24D-L means in plain language
When cargo, equipment, or other materials extend beyond the sides or rear of your vehicle, federal safety rules require you to light and mark those projections so other drivers can see them clearly. 393.24D-L addresses failures to provide that lighting or marking.
This applies whether your load extends 6 inches or several feet beyond your truck body. If something sticks out, it needs to be illuminated and marked—typically with reflectors, warning lights, or high-visibility tape—depending on conditions and the nature of the projection. The requirement exists to prevent accidents caused by drivers not seeing what's hanging off your vehicle in low-light conditions.
The regulation covers both active lighting (like clearance lights) and passive marking (reflective devices). During a roadside inspection, an officer will look for working lights on projecting loads and proper reflective markings, especially on wide loads, ladder racks, tool boxes, or any freight that extends beyond your vehicle's footprint.
What our enforcement data actually shows
Across our 13 million+ inspection records, 393.24D-L is not a high-volume citation. We've recorded 345 all-time citations for this code, with 215 citations issued in the last 12 months and 54 in the last 90 days. Nationally, 393.24D-L ranks #1040 out of 3,036 FMCSR codes by citation volume.
What stands out most: this code has a 0.0% out-of-service rate. None of the 345 citations in our database resulted in the vehicle being placed out of service. This is dramatically lower than the all-FMCSR average OOS rate of 31.4%, which means inspectors are treating 393.24D-L violations as correctable on-the-spot or as warning-level infractions rather than immediate safety removals.
The monthly trend shows steady enforcement, with citations ranging from 5 to 28 per month over the last year. November 2025 and January 2026 saw the highest counts (28 and 27 citations respectively), suggesting seasonal variation tied to heavier loads during freight and holiday peaks.
Who gets cited most
Our inspection records show California leads by a large margin: 58 citations in the last 180 days, followed by Wisconsin with 12 and Michigan with 4. All three states maintained a 0.0% OOS rate, consistent with the national trend for this code.
Carriers citing in our data include CLAUDIA BELINDA ANDARZA LEAL (USDOT 963435) with 6 citations and ALMA LUZ SANTOS SALDIVAR (USDOT 1806071) with 3 citations. These represent owner-operators and smaller carriers; enforcement is distributed broadly rather than concentrated at major fleets.
Vehicle makes cited most frequently are Freightliner models (51 citations), followed by Utility trailers (24 citations) and wreckers/heavy-haul rigs (22 citations). Freightliner trucks in general account for 76 citations, suggesting this code is particularly common on vocational and heavy-duty rigs where loads and equipment regularly project.
How severe is this compared to similar codes
Within the Vehicle Maintenance category, 393.24D-L is a low-severity violation. Compare it to nearby codes:
- 393.9(a) — Inoperable required lamps: 660,737 citations with a 15.4% OOS rate. This is far more frequently cited and more likely to trigger out-of-service action.
- 393.11 — Lighting devices/reflectors: 179,734 citations with a 1.8% OOS rate. Similar in subject matter but much higher citation volume, indicating broader enforcement on general lighting failures.
- 396.3(a)(1) — Inspection/repair/maintenance general: 236,919 citations with a 45.3% OOS rate. This catches systemic maintenance failures and is far more severe.
The data indicates 393.24D-L is a niche violation, occurring most often on vehicles with specialized cargo or equipment, and treated leniently in enforcement.
How to avoid it
Our inspection data reveals patterns in co-occurring violations that point to prevention strategies. When 393.24D-L appears alongside other codes, inoperable required lamps are the most common companions (9 shared inspections in the last 90 days). This suggests many citations stem from projecting loads that lack working lights in the first place.
Pre-trip and load preparation steps:
- Walk your entire vehicle after loading. Before you leave the lot, walk around the truck and trailer to identify anything extending beyond the body lines—ladder racks, spare tires, toolboxes, tarped freight, or suspended equipment. This is your primary defense.
- Test all lights before departure. Check clearance lights, marker lights, and any auxiliary lighting you've installed on racks or projections. Our data shows inoperable lamps on projecting loads are the #1 co-occurring issue; a working light fixes both problems.
- Use reflective marking if you lack lights. If your equipment can't accommodate active lighting, apply high-visibility reflective tape or stickers to the sides and rear of the projection. Make sure it's clean and visible in low light.
- Inspect your loading procedure. If your company routinely has projecting loads, establish a standard loading protocol and assign responsibility for pre-trip verification. The carriers with repeat citations likely skipped this step.
- Pay attention to seasonal loads. Our data shows citations spike in late fall and winter. If you haul seasonal cargo (construction equipment, landscaping gear, holiday freight), be extra vigilant about lights and marking on those runs.
- Check Freightliner-specific installations. Because Freightliner trucks dominate our citation data for this code, if you operate a Freightliner, audit your lighting harness and any aftermarket racks or equipment you've added. Aftermarket gear sometimes lacks integrated lighting.
The zero OOS rate means this violation won't shut you down, but a citation is still a mark on your inspection record and can contribute to a negative safety profile if repeated. The fix is cheap—working lights and reflective tape cost far less than fighting citations or dealing with an accident because your load extension was invisible to another driver.