What 173.3 means in plain language
FMCSR 173.3 is part of the Department of Transportation's hazardous materials regulations. This section sets out rules for how hazardous materials must be classified, packaged, and prepared for transport. The regulation covers the fundamental processes that determine what a shipper or carrier must do before a hazmat load ever leaves the dock.
If you've been cited for 173.3, an inspector found that something about how the hazmat was classified, prepared, or documented didn't meet federal standards. This might involve incorrect hazard classification, improper packaging decisions, or documentation that doesn't match what's actually in the vehicle. The violation sits upstream of loading and placarding—it's about the preparatory work that should happen before transport begins.
Because this is a hazmat regulation, it carries significant weight in compliance programs, even though the enforcement numbers tell a different story.
What our enforcement data actually shows
Across our database of 13 million+ roadside inspections, 173.3 has generated only 9 citations all-time, with zero citations in the last 12 months and zero in the last 90 days. This makes it ranked #2230 out of 3,036 FMCSR codes by citation volume—essentially one of the rarest violations inspectors encounter.
None of the 9 all-time citations resulted in an out-of-service order, giving this code a 0.0% OOS rate. By contrast, the all-FMCSR average OOS rate is 31.4%, meaning inspectors place drivers out of service on roughly one in three violations. The fact that 173.3 has never triggered an OOS order suggests that when it is cited, inspectors typically view it as a documentation or administrative issue rather than an immediate safety threat on the road.
The rarity of this citation in recent months indicates that either compliance is very high, or inspectors are focusing enforcement effort on other hazmat codes with higher violation rates.
Who gets cited most
Our inspection records show that 173.3 citations are so sparse that no single state dominates the pattern. The 9 all-time citations are distributed across multiple carriers with only 1 citation each. Notable fleets in our data with this citation include J B HUNT TRANSPORT INC, BLOSSMAN GAS INC, and KLLM EXPEDITED SERVICES LLC—each with a single 173.3 citation in our records. The wide dispersion across carriers and the absence of repeat offenders underscores how uncommon this violation is.
Vehicle makes cited include a mix of Freightliners (3 citations), Fords (2), and single instances of Volvo, Utility trailers, and other equipment. No particular vehicle type shows a pattern that would suggest mechanical or design vulnerability to this violation.
How severe is this compared to similar codes
In the hazardous materials category, 173.3 sits far below its peer codes in enforcement volume. The closest peer violations are far more frequently cited: 177.834A-HMC (general loading/unloading hazmat) has generated 3,954 citations with a 99.2% OOS rate, and 177.834(a) has 3,839 citations at a 97.9% OOS rate. Even 177.817(a) for placarding violations shows 2,274 citations at a 75.1% OOS rate.
By comparison, 172.602(c)(1) (maintenance of Emergency Response information) has 1,464 citations but a 0.0% OOS rate—matching 173.3's zero OOS rate. This tells you that some hazmat documentation and preparation violations are treated as non-safety-critical at roadside, while actual loading, unloading, and placarding errors generate immediate out-of-service consequences.
How to avoid it
Because 173.3 concerns hazmat classification and preparation before loading, your prevention strategy should focus on the shipper and your documentation review:
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Verify hazard classification on the shipping papers before accepting the load. Compare the hazard class, packing group, and proper shipping name on the bills of lading or manifests to the actual commodity. If there's any mismatch, contact the shipper before you pick up.
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Review packaging condition and compatibility during your pre-trip inspection. Check that containers are intact, lids are secure, and multiple incompatible materials aren't packed in the same case or pallet without proper segregation.
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Ensure all hazmat documentation is complete and legible. Shipping papers must include the proper shipping name, hazard class, UN number, packing group, and emergency contact. If any field is blank, missing, or illegible, refuse the load and notify the shipper.
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Ask the shipper or broker if the load was classified and packaged by a certified hazmat employee. FMCSR 173.3 compliance begins with the person preparing the shipment. If you have reason to believe the classification is wrong, you have the right to challenge it before transport.
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Document your acceptance. Keep a copy of the shipping papers you accepted, including the date and time. If you're later cited, that record shows you relied on shipper-provided information and performed due diligence.
The rarity of this citation in our 13 million+ inspection records suggests that most drivers who handle hazmat already do this work correctly. Stay alert during pre-trip, ask questions if something looks wrong, and don't move a load until the paperwork and packaging both make sense.