What 172.302(b) means in plain language
When you transport hazardous materials in bulk packages, federal regulations require that package markings meet specific size requirements. These markings communicate critical information to other drivers, emergency responders, and inspection officers about what's inside and how to handle it safely.
A 172.302(b) citation means an inspector found that the size of markings on your bulk package fell short of the standard. The markings might have been too small to read easily, making it difficult for anyone handling the cargo to understand its hazardous nature. This is a documentation and communication issue in the hazmat compliance chain.
What our enforcement data actually shows
Across our 13 million+ roadside inspection records, 172.302(b) ranks #2406 out of 3,036 FMCSR codes by citation volume. All-time enforcement shows just 5 citations total. In the last 12 months, we recorded 0 citations, and in the last 90 days, 0 citations.
None of the 5 all-time citations resulted in an out-of-service order. The OOS rate for this code is 0.0%—substantially lower than the all-FMCSR average of 31.4%. This difference reflects that inspectors treat marking-size deficiencies as correctable documentation problems rather than immediate safety threats that warrant removing a vehicle from service.
Who gets cited most
Our inspection records show fleets such as TFORCE FREIGHT INC with 1 citation. The remaining citations are distributed across four other carriers, each with 1 citation: PRO JECT CHEMICALS LLC, SELECT WATER SOLUTIONS LLC, HIGH PRESSURE TRANSPORTS LLC, and SQUARE G INCORPORATED. No single carrier or region dominates the enforcement pattern, reflecting that this violation occurs sporadically across the hazmat transportation industry.
How severe is this compared to similar codes
Hazmat marking and placarding violations vary widely in enforcement frequency and severity. Our data shows 172.502(a)(1)—Placarding general requirements—was cited 1,820 times with an 18.5% OOS rate. 172.516(c)(6)—Placard damaged deteriorated or obscured—recorded 1,796 citations but only a 1.6% OOS rate, similar to 172.302(b)'s pattern of low removal-from-service outcomes.
By contrast, general loading and unloading hazmat violations (177.834A-HMC and 177.834(a)) show dramatically higher enforcement volume and severity, with OOS rates exceeding 97%. These involve physical handling defects, not marking documentation. Placarding violations (177.817(a)) were cited 2,274 times with a 75.1% OOS rate, reflecting that missing or incorrect placards pose more immediate operational risk than marking-size issues.
How to avoid it
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Pre-trip inspection of bulk packaging. Before accepting or loading a bulk hazmat package, verify that all required markings are present and legible. Check that numbers, letters, and symbols meet the minimum height and visibility standards for your package class. Don't rely on markings that are faded, worn, or obscured by dirt or weather.
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Know your hazmat package specifications. Familiarize yourself with the marking requirements for the specific hazardous materials your fleet transports. Different hazard classes and categories may have different marking-size rules. Your safety department or hazmat coordinator should provide guidance on package inspection criteria.
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Report and refuse non-compliant cargo. If you encounter a bulk package with markings that appear undersized or illegible, document the issue and notify your dispatcher or safety manager before loading. Do not assume the shipper's compliance; your pre-trip inspection is the last line of defense before the road.
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Maintain records of pre-trip checks. Log your package inspections, especially any rejections or corrective actions. This documentation demonstrates your commitment to hazmat compliance and can support your defense if a citation is issued.