What 178.345-14C means in plain language
When you haul hazardous materials in a cargo tank (DOT406, DOT407, or DOT412 vehicle), federal law requires a specification plate to be permanently attached to that tank. This plate documents the tank's design, capacity, construction standards, and safety ratings — essentially a label that tells inspectors and emergency responders what the tank is built to carry and how it was built.
The specification plate must be clearly visible, readable, and intact. It serves as proof that the tank meets federal Department of Transportation standards for hazmat transportation. If an inspector finds that your tank is missing this plate, has an illegible plate, or has one that doesn't match the vehicle type you're operating, you'll be cited under 178.345-14C.
This isn't about what's inside the tank or how you're transporting it — it's purely about whether the tank itself carries the required DOT identification plate in a legible condition.
What our enforcement data actually shows
Across our 13 million inspection records, 178.345-14C is rarely cited. All-time, we see 12 total citations for this code, ranking it #2132 out of 3,036 FMCSR codes by citation volume. In the last 12 months, there were 4 citations, and in the last 90 days, just 1.
Out-of-service outcomes are nonexistent for this violation. Across all 12 all-time citations in our database, zero vehicles were placed out of service, yielding a 0.0% OOS rate. This is significantly lower than the all-FMCSR average OOS rate of 31.4%, meaning inspectors treat this citation as a documentation or maintenance issue rather than an immediate safety threat requiring vehicle removal from the road.
The rarity of this citation suggests that most tank carriers maintain proper specification plates, or that the violation is difficult to detect during routine roadside inspections.
Who gets cited most
In the last 180 days, our inspection records show Texas with 1 citation and a 0.0% OOS rate.
Historically, the carriers cited for this violation include fleet operators such as Associated Petroleum Carriers Inc (USDOT 104701), City Mart Energy LLC (USDOT 1838618), and Transportes Arlequin SA de CV (USDOT 1879622), each with 1 citation in our database. The distribution is so sparse that no single carrier pattern emerges — this is not a systemic problem for any fleet type.
How severe is this compared to similar codes
Hazardous materials codes span a wide severity range. Consider these peer violations in the same category:
177.834A-HMC (General loading/unloading hazmat) has been cited 3,954 times with a 99.2% OOS rate — drivers and vehicles are routinely removed from service. 177.817(a) (Placarding violation) shows 2,274 citations with a 75.1% OOS rate, still very serious. Even 172.502(a)(1) (Placarding general requirements) has 1,820 citations with an 18.5% OOS rate.
By contrast, 178.345-14C's 12 all-time citations and 0.0% OOS rate place it at the bottom of the severity spectrum for hazmat violations. It's a compliance and documentation issue, not a transportation-method or cargo-handling failure.
How to avoid it
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Inspect your specification plate at the start of every shift. Before you accept a tank vehicle, walk around it and locate the DOT specification plate. Verify it's firmly attached, not cracked, and fully legible. If the lettering is faded or the plate is loose, request repair or reassignment.
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Ensure the plate matches your assigned load. The specification plate will specify which DOT standard the tank meets (406, 407, or 412). Confirm this matches the hazmat commodity you're about to haul. A mismatch could cause an inspector to flag the vehicle.
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Report missing or damaged plates to fleet maintenance immediately. If you discover a plate is missing, bent, or unreadable, don't attempt a load. Report it in writing or through your fleet's maintenance system so the tank can be repaired before the next trip.
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Check the plate after any accident or incident. Collisions, hard stops, or wind damage can dislodge or damage the specification plate. After any noteworthy event, do a visual check to confirm the plate is still intact and readable.