What 393.116D1 means in plain language
This code covers the requirement that intermodal containers—the large metal boxes used in shipping—must be securely fastened to the chassis or platform they're loaded onto. Whether you're hauling a container for a shipper, a port terminal, or an intermodal facility, the container itself cannot shift, tip, or detach during transit.
Proper securement means the container is locked or otherwise mechanically fastened using approved equipment (twist-locks, turnbuckles, or similar devices) so it remains in place through normal driving, braking, and turning. An inspector checking this violation is looking at whether those fastening devices are present, functional, and actually engaged—not just loose or missing.
If a container is not properly secured, it creates a serious safety hazard: load shift during emergency braking, potential tipping on curves, or worst case, the container separating from your vehicle entirely. This is why inspectors flag it every time.
What our enforcement data actually shows
Across our 13 million+ inspection records, this code has generated only 1 citation all-time, with 0 citations in the last 12 months and 0 in the last 90 days. That low volume means it's ranked #2796 of 3,036 FMCSR codes—near the bottom of enforcement activity.
What stands out, however, is the out-of-service rate. Our data shows that when this violation does appear, it results in the vehicle being placed out of service 100% of the time (1 citation resulting in 1 OOS placement). Compare that to the all-FMCSR average OOS rate of 31.4%: this code triggers roadside removal far more often than most other violations. That reflects the safety-critical nature of the defect—an improperly secured container is not a minor repair item; it's a hazard that stops you immediately.
The rarity of citations suggests that most drivers and fleets are getting this right. But when an inspector does cite it, enforcement is swift and complete.
Who gets cited most
Our all-time records show only 1 citation for this code, attributed to Baldwin Lumber Company (USDOT 897525). With such limited enforcement history, regional or state breakdowns are not meaningful—there's insufficient data to identify a concentration in particular states or carrier types.
The vehicle makes cited were HMDE and PTRB, each appearing once. Again, this reflects the rarity of the violation rather than a pattern.
How severe is this compared to similar codes
Within the Vehicle Maintenance category, other cargo and securement codes show vastly different enforcement patterns. For example:
- 393.9(a) — Inoperable required lamps: 660,737 citations with a 15.4% OOS rate. Lamps are enforced far more frequently, but when they fail, they're less likely to trigger immediate removal.
- 396.3(a)(1) — Inspection/repair/maintenance (general): 236,919 citations with a 45.3% OOS rate. This broader maintenance violation is cited more often and results in OOS placement roughly 45% of the time—far more common than 393.116D1.
- 393.47E — Slack adjuster defective: 180,363 citations with a 0.0% OOS rate. Brake adjusters are cited frequently but rarely taken out of service on the spot, likely because drivers can often adjust or repair them roadside.
The contrast illustrates that 393.116D1, while rare in raw citation count, is treated as a critical safety issue. Its 100% OOS rate reflects that an unsecured intermodal container is not a deferrable defect—it must be corrected before you move the vehicle.
How to avoid it
Practical steps to ensure your intermodal container is compliant:
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Pre-trip securement check: Before departing, walk around the loaded container and visually verify that twist-locks or other approved fastening devices are engaged at all four corners (or per the manufacturer's specification for your specific container and chassis type). Don't assume the shipper or loading dock installed them correctly—your responsibility begins when you accept the load.
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Know your equipment: Familiarize yourself with the twist-lock or fastening mechanism on your chassis. If you drive multiple tractors or trailers, variations exist. Ensure you understand how to properly engage and disengage each type, and confirm the locking pin is fully seated and any safety clips are in place.
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Inspect for damage or wear: Check the fastening points and devices for cracks, corrosion, bent pins, or missing parts. Worn or damaged equipment can fail to hold the container securely, even if it looks engaged. Report defects to maintenance immediately.
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Verify match between container and chassis: Not all containers fit all chassis, and not all fastening devices are universal. Confirm compatibility before loading. An undersized or oversized container, or one with non-standard corner fittings, can slip or shift even if you attempt to secure it with standard locks.
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Load stability awareness: Even with proper securement, be mindful of how the load is distributed inside or on the container. An unbalanced or shifting load inside the box can place uneven stress on the securing points. If you suspect the interior load has shifted during transit, have the container inspected before continuing.
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Document your check: Note the securement status in your pre-trip inspection log or vehicle report. If an inspector asks, you'll have contemporaneous evidence that you verified the fastening before departure. This is especially important if the shipper or terminal loaded the container—your documented check protects you.
Because citations for this code are extremely rare, most carriers and drivers are executing proper securement consistently. Staying in that group means making the pre-trip container check a non-negotiable habit, understanding your equipment, and reporting defects immediately so maintenance can prevent a citation and, more importantly, prevent a safety incident on the road.