What 393.24(a) means in plain language
When your load sticks out beyond the sides or rear of your vehicle, federal regulations require that it be properly lit and marked so other road users can see it. The rule covers both the lighting and the marking side of that requirement — if your projecting cargo lacks the right lamps, reflectors, or flags, you're in violation.
The intent is straightforward: an unmarked or unlit overhang is a hazard, especially at dawn, dusk, or night. A driver in an adjacent lane or approaching from behind may have no way to judge where your load ends without the required markers.
This applies regardless of whether the projection is out the back or off the side of the trailer or truck body. Both directions are covered, and inspectors look at both.
What our enforcement data actually shows
Across our database of 13 million+ inspections, 393.24(a) has generated 2,451 all-time citations, placing it at #492 out of 3,036 FMCSR codes by total citation volume. That's a mid-tier enforcement frequency — common enough to be a real exposure, but not among the highest-volume codes inspectors chase.
The out-of-service picture is notably mild. Of those 2,451 citations, only 17 resulted in a vehicle being placed out of service — an OOS rate of just 0.7%. To put that in context, the all-FMCSR average OOS rate across all codes in our database is 31.4%. At 0.7%, this code sits far below that average, meaning the overwhelming majority of drivers cited for 393.24(a) — 2,434 out of 2,451 — kept rolling after the citation was issued.
The code is not OOS-eligible under standard criteria, which explains that low rate. The 17 historical OOS placements likely reflect situations where the projecting load combined with other defects pushed the inspector to pull the vehicle.
Recent activity has gone quiet: our records show 0 citations in the last 90 days and 0 in the last 12 months. That doesn't mean enforcement has stopped permanently, but it does indicate this code isn't currently a hot-button priority at the national level.
Who gets cited most
The STATISTICS block for this code does not include a state-level breakdown, so we won't speculate on geography. What the data does show is the carrier distribution across those 2,451 citations.
No single carrier dominates the citation list. Our data shows fleets such as Federal Express Corporation (USDOT 86876) with 5 citations and Evans Delivery Company Inc (USDOT 38111) with 4 citations leading the all-time count. That spread — with the highest carrier at just 5 citations across the entire dataset — tells you this violation is distributed broadly rather than concentrated in a handful of operations.
Looking at vehicle makes, Freightliner (FRHT) tops the list with 287 citations, followed by Peterbilt (PTRB) at 141 and Kenworth (KW) at 135. These are simply the most common platforms on the road, so their presence at the top reflects fleet size more than any platform-specific deficiency. That said, if you're running a Freightliner, Peterbilt, or Kenworth with any kind of projecting load, inspectors have historically looked at this on those trucks — keep your marking and lighting game tight.
How severe is this compared to similar codes
Within the Vehicle Maintenance category, 393.24(a)'s 2,451 citations look small next to the heavy hitters. Consider 393.9(a) — Inoperable required lamps, which has accumulated 660,737 citations in our database with a 15.4% OOS rate. That's more than 269 times the citation volume of 393.24(a) and an OOS rate more than 20 times higher.
393.11 — Lighting devices/reflectors shows 179,734 citations and a 1.8% OOS rate — still roughly 73 times the volume of 393.24(a), though its OOS rate is closer to the projecting-load code's 0.7%.
The CSA severity weight for 393.24(a) is 3, which is on the lower end of the severity scale. By comparison, codes that trigger OOS placements routinely carry higher severity weights. A weight-3 citation will add points to your CSA score, but this isn't the kind of violation that triggers immediate intervention thresholds on its own.
Bottom line: 393.24(a) is a real citation with real CSA consequences, but it sits in a lower tier of severity and OOS risk compared to most lighting and maintenance codes in the same category.
How to avoid it
This violation is almost entirely preventable with a disciplined pre-trip. Here's what to build into your routine whenever you're hauling any load that extends beyond the vehicle profile:
- Walk the full perimeter of the load before every departure. Check whether any part of the cargo extends past the sides or rear of the trailer or truck body. If it does, the marking and lighting requirements are triggered — no exceptions for short hauls or daylight-only runs.
- Verify rear overhang markers are in place and working. For loads projecting beyond the rear, confirm that the required red flags (daytime) and red lamps or reflectors (nighttime or low-visibility conditions) are physically attached and functional. A flag that fell off at the last stop is your liability at the next scale.
- Check side projections separately. Side overhang is easy to forget when you're focused on the rear. Walk each side and confirm any lateral projection is also properly flagged or lit depending on conditions.
- Test every lamp you've added for the load before you pull out. Plug in any auxiliary marking lamps and confirm they illuminate. A dead bulb on a projecting-load lamp is a citation waiting to happen.
- Document your pre-trip check on projecting loads. If you're a fleet manager, build a projecting-load checklist item into your DVIRs for any run where oversize or extending cargo is carried. Our data shows Freightliner, Peterbilt, and Kenworth units account for the majority of citations — if your fleet runs those platforms with flatbed or specialized configurations, targeted training on this code pays dividends.
- Double-check after any stop where the load was adjusted or restrapped. Marking devices can be knocked loose during cargo adjustments. A quick walk-around after a reload stop takes 90 seconds and can prevent a CSA hit.