What 172.313(a) means in plain language
When you transport hazardous materials, packages must be marked and labeled so anyone handling them—including emergency responders—knows what's inside and what risks they face. This regulation requires that packages containing materials that do not pose an inhalation hazard must be labeled accurately to reflect that fact.
In practice, this means the label on the package must correctly identify whether the substance inside presents an inhalation risk or not. If a material is not an inhalation hazard, the packaging and labeling must clearly communicate that status. Getting this wrong—either by mislabeling a hazardous inhalation material, or by failing to properly mark a non-inhalation-hazard package—violates this rule.
The reason this matters: emergency crews and dock workers rely on package labels to make split-second decisions about containment, evacuation, and treatment. A mislabeled or unlabeled package can lead to the wrong response and put people at risk.
What our enforcement data actually shows
Across our 13 million+ inspection records, 172.313(a) citations are exceptionally rare. All-time, we have recorded only 1 citation for this code. In the last 12 months, we saw 0 citations, and in the last 90 days, 0 citations.
When this violation has been cited, the outcome was severe: the vehicle was placed out of service in that single case, giving this code a 100.0% out-of-service rate. This is substantially higher than the all-FMCSR average OOS rate of 31.4%. However, because the enforcement volume is so low, this statistic reflects a single incident rather than a pattern.
By citation volume, 172.313(a) ranks #2796 out of 3,036 FMCSR codes—placing it among the least-enforced violations in the federal motor carrier safety regulations. The rarity of citations suggests that either compliance is very high, or inspectors rarely encounter packages where this specific labeling error occurs.
Who gets cited most
Our data shows that Cannonball Trucking Inc (USDOT 338347) received 1 citation for this code across our entire inspection history. With enforcement volume at a single citation all-time, state-level and multi-carrier analysis is not meaningful.
The extreme rarity of this violation means most carriers and drivers will never encounter it during their career. If you have been cited, you are in a very small group.
How severe is this compared to similar codes
Within the Hazardous Materials category, labeling and placarding violations carry widely different enforcement weight. Our data shows stark contrasts:
- 177.834A (General loading/unloading hazmat) and 177.834(a) (General loading/unloading hazmat) are enforced thousands of times more frequently—with 3,954 and 3,839 citations respectively—and both carry OOS rates above 97%, meaning nearly all result in out-of-service orders.
- 177.817(a) (Placarding violation) has logged 2,274 citations with a 75.1% OOS rate, still far more common and more likely to trigger an OOS placement.
- 172.502(a)(1) (Placarding general requirements) has 1,820 citations but a much lower 18.5% OOS rate, suggesting labeling errors on the vehicle itself are treated less severely than errors on the package itself.
- 172.516(c)(6) (Placard damaged, deteriorated, or obscured) has 1,796 citations but only a 1.6% OOS rate, indicating that damage to existing labels is rarely an out-of-service violation.
The 100.0% OOS rate on 172.313(a), paired with its rarity, suggests inspectors treat inhalation hazard mislabeling as a serious violation when they do encounter it—likely because misidentifying inhalation risk could trigger a dangerous emergency response.
How to avoid it
Because this code is so rarely cited, your best defense is thoroughness in the hazmat shipping process before you ever touch the load:
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Verify the shipper's label before accepting the load. Before signing the bill of lading, physically inspect every hazmat package on your truck. Match the label description to the hazmat placard and shipping papers. If the label says "non-inhalation hazard" but the shipping papers indicate respiratory risk, do not accept the load—contact the shipper and clarify.
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Know the difference between inhalation and non-inhalation hazards on your common loads. If you regularly haul certain materials (solvents, powders, liquids, gases), learn which are classified as inhalation hazards. This takes 30 minutes of study and prevents confusion during pre-trip inspection.
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Cross-reference shipping papers with package labels. Hazmat shipping papers (manifests, bills of lading) must match the physical label on the package. If you see a discrepancy, stop. Do not move the vehicle. Report it to dispatch and the shipper.
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Photograph labeling on high-value or unfamiliar loads. If you are hauling a hazmat commodity you do not regularly transport, take a photo of the label before departure. If an inspector questions it later, you have documentation of what you accepted.
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Request shipper training if your fleet is new to hazmat. If your company recently began transporting hazardous materials, ask for formal hazmat labeling and placarding instruction. The low citation rate on this code suggests most drivers get it right—learning from those who do is the fastest path to compliance.
The fact that this violation is so rare should reassure you: it is not a common trap. Diligent attention to shipping papers and a quick visual inspection of package labels will protect you.