What 393.116D4 means in plain language
Intermodal containers — the large standardized boxes you haul on chassis or flatbed platforms — must be mechanically secured. That means locking devices, twist locks, or other approved securement hardware must be engaged and functional before you roll. The container cannot shift, rock, or come loose during transit.
This goes beyond just placing the container on the chassis. Every attachment point that's specified by the container manufacturer or the platform design must be active. If locks don't engage, if bolts are missing, or if the securing mechanism shows damage or corrosion that prevents a tight hold, you're in violation.
The inspector is checking that your pre-trip process catches these issues before the vehicle leaves the lot. It's a straightforward safety rule: unsecured cargo can shift during braking, cornering, or emergency maneuvers, creating hazard to other road users.
What our enforcement data actually shows
Across our 13 million+ inspection records, 393.116D4 ranks #2796 out of 3,036 FMCSR codes by citation volume. All-time, we have logged 1 citation for this violation. In the last 12 months, our database shows 0 citations, and in the last 90 days, 0 citations.
When this code does result in enforcement action, the data tells a stark story: the out-of-service rate is 100.0%. Out of 1 citation on record, 1 resulted in the vehicle being placed out of service. That's well above the all-FMCSR average OOS rate of 31.4%.
The extremely low citation volume means this violation is either rare in practice or caught very infrequently. Either way, when an inspector does cite it, the severity of the enforcement response is substantial.
Who gets cited most
Our inspection records show that intermodal container securement citations are exceedingly uncommon in our dataset. The one citation on record involved GLASSCOCK LOG & LUMBER INC (USDOT 643808).
With only one historical citation across 13 million inspections, there is no meaningful geographic pattern or carrier trend to report. This is not an indication of compliance excellence in any particular region or fleet — it simply reflects how infrequently this specific violation appears in roadside enforcement.
How severe is this compared to similar codes
Comparing 393.116D4 to related cargo and vehicle maintenance codes tells you something about how inspectors approach securement:
393.9(a) — Inoperable required lamps has generated 660,737 citations with a 15.4% OOS rate. That code is far more common but results in OOS placement roughly one-fifth as often.
396.3(a)(1) — Inspection/repair/maintenance general shows 236,919 citations with a 45.3% OOS rate. That's a broader maintenance code with higher OOS severity than lamp issues but lower than what we see with 393.116D4.
393.47E — Slack adjuster defective has 180,363 citations but a 0.0% OOS rate. Even a critical brake component defect doesn't automatically place vehicles out of service as often as a securement issue does.
The 100% OOS rate on 393.116D4 sits at the extreme end of enforcement severity. When inspectors flag unsecured intermodal cargo, the risk is judged so high that immediate removal from service is the standard response.
How to avoid it
Build these checks into your daily pre-trip routine, especially when you're working with intermodal containers:
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Verify all locking devices are engaged. Walk the perimeter of the container before departing. Twist locks on each corner should rotate fully and catch with audible or tactile confirmation. Do not rely on memory or assumption — physically test each one.
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Check for visible damage or corrosion on securement hardware. Rust, bent bolts, cracked welds, or missing pins are red flags. If the hardware is compromised, notify dispatch and the chassis owner. Do not depart.
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Confirm the container sits flush on the chassis or platform. Rock it gently from the ground. Any movement or gap indicates improper seating or failure of locks. If you feel play, stop and investigate before moving.
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Know your platform's securement specification. Different chassis designs use different locking systems. Review the documentation for your regular equipment so you know exactly how many locks you need, where they're located, and how they should feel when properly set.
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Inspect twist locks for debris or ice. Dirt, mud, or frozen moisture can prevent full engagement. Clean them during pre-trip and ensure nothing blocks the locking mechanism.
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Document your pre-trip in writing. If you're operating under a fleet program, note the container ID, lock count, and condition of hardware. If an inspector later questions securement, your written record proves you performed due diligence.
The enforcement data makes clear: when securement is questioned, it results in immediate OOS status. The cost of downtime and lost miles far exceeds the five minutes it takes to thoroughly check your locks.