What 393.100(b) means in plain language
Every tie-down strap, chain, binder, or other securement device on your load has a rated working load limit stamped or tagged on it. Federal regulations require that when you add up the working load limits of all the devices holding a given piece of cargo, that combined total has to meet or exceed a threshold tied to the weight of what you're hauling. The rule at 393.100(b) is violated when the securement hardware you've used simply doesn't have enough combined rated capacity for the load it's supposed to restrain.
This is not about whether a strap looks worn or whether a chain is the wrong length. It's a math problem. Inspectors look at the rated capacity of each device and compare the aggregate to what the regulation requires. If you've used four straps rated at 1,000 lbs working load each but your cargo demands more than that combined capacity, you're in violation — regardless of whether anything has actually shifted.
In practice, this most often surfaces when drivers use too few tie-downs, use devices that are undersized for the cargo weight, or mix devices with low individual ratings without accounting for the total. Understanding the capacity requirements for your specific commodity before departure is the only reliable way to stay compliant.
What our enforcement data actually shows
The numbers here are stark. Across our database of 13 million+ inspections, 393.100(b) has generated 16,155 all-time citations — ranking it #160 out of 3,036 FMCSR codes by citation volume. That puts it well inside the top 6% of all cited regulations nationwide.
What really sets this code apart is what happens after the citation is written. Our inspection records show that 15,622 of those 16,155 citations — a 96.7% out-of-service rate — resulted in the driver being placed out of service on the spot. To put that in context, the all-FMCSR average OOS rate across every code in our database is 31.4%. A violation of 393.100(b) is more than three times as likely to park your truck as the average FMCSR citation. Only 533 citations, or about 3.3%, did not result in an OOS order.
If you're reading this after a roadside stop, the data strongly suggests you are already sitting. An OOS order means the load cannot move until the securement deficiency is corrected and a re-inspection clears the vehicle.
One important note on recent trends: our database shows 0 citations in the last 90 days and 0 in the last 12 months for this specific code. This likely reflects a coding or reporting shift in how inspectors are capturing aggregate load violations in newer inspection records, rather than a true disappearance of enforcement. The all-time volume and OOS rate remain the authoritative picture of how seriously this violation is treated.
Who gets cited most
The citation data does not include a state-level breakdown for this code, so we cannot rank states by volume here. What our data does show at the carrier level is that no single operation is immune. Our records show fleets such as WESTERN EXPRESS INC (USDOT 511412) with 58 citations and N W WHITE & COMPANY (USDOT 376777) with 40 citations appearing at the top of the all-time list. These are carriers operating across multiple vehicle types and commodities, which underscores that aggregate load limit compliance is a challenge that cuts across industries — flatbed, waste hauling, construction, and expedited freight all appear in the top-cited carriers list.
The top cited vehicle makes in our database for this code include Ford at 938 citations, Freightliner at 736, Mack at 677, Kenworth at 652, and Peterbilt at 567. The spread across makes confirms this is not a vehicle-specific defect — it is an operator practice issue that appears on virtually every platform type.
How severe is this compared to similar codes
Looking at peer codes in the Vehicle Maintenance category helps frame where 393.100(b) sits on the severity spectrum.
393.9(a) — Inoperable required lamps is the single highest-volume code in this category, with 660,737 all-time citations. But its OOS rate is only 15.4% — meaning most lamp violations result in a warning or citation rather than an OOS order. Compare that to 393.100(b)'s 96.7% OOS rate, and the difference is dramatic: a lamp violation is roughly six times less likely to park your truck.
396.3(a)(1) — Inspection, repair, and maintenance (general) has 236,919 citations and a 45.3% OOS rate. That's a meaningful OOS rate, but still less than half the rate seen with 393.100(b).
396.17(c) — No proof of periodic inspection shows 198,331 citations but a 0.0% OOS rate in our database, meaning it essentially never results in an OOS order on its own. This is the opposite end of the spectrum from 393.100(b).
The pattern is clear: 393.100(b) is one of the most OOS-certain violations an inspector can write. The regulatory philosophy is straightforward — unsecured or under-secured cargo is an active public safety threat, and the truck doesn't move until that threat is resolved.
How to avoid it
Every one of these actions can be completed before the wheels roll.
- Know the working load limit (WLL) of every device you carry. The WLL is printed or tagged on each strap, chain, and binder. If you cannot read the WLL because the tag is missing or the stamp is worn, treat that device as unusable for compliance purposes.
- Do the math before you close the gate. Add up the WLLs of all devices on each cargo unit. Know the weight of what you're hauling and verify the aggregate meets the regulatory threshold for that commodity type. Don't estimate.
- Inspect straps and chains on every Ford, Freightliner, Kenworth, and Peterbilt pre-trip. Our data shows these makes account for thousands of citations under this code. High-cycle vehicles accumulate strap wear fast — check every device for cuts, abrasions, and hardware damage that can reduce rated capacity.
- Count your tie-downs against the cargo, not against habit. A load you've hauled fifty times with four straps still requires you to verify those four straps have enough combined WLL today, with today's cargo weight.
- Replace any device that shows capacity-reducing damage immediately. A strap with a cut, a chain with a stretched link, or a binder with a bent hook is not the same device as its rated WLL suggests. Carry spares.
- Document your securement calculation in your pre-trip notes. If an inspector asks how you arrived at your tie-down count and capacity, having written numbers on hand demonstrates deliberate compliance rather than guesswork.