What 177.840A means in plain language
When you transport hazardous materials, you are required to carry emergency response information that tells first responders—firefighters, police, paramedics—what they're dealing with if something goes wrong. This isn't just a placard on the side of your truck. It's actual documented information about the hazmat you're hauling: what it is, what it does, and how to handle an emergency.
A 177.840A citation means a DOT inspector found that your CMV was carrying hazardous materials but lacked this required emergency response information. This could mean the information was missing entirely, incomplete, or not accessible during the inspection. The regulation requires that CMVs transporting hazmat have this information on hand and readily available so that in an accident, spill, or fire, emergency personnel can respond correctly and safely.
What our enforcement data actually shows
Our inspection records show that 177.840A is a relatively uncommon violation across the 13 million inspections in our database. All-time, we have recorded 6 citations for this code. In the last 12 months, we documented 4 citations, and in the last 90 days, just 1 citation. This ranks 177.840A at #2357 out of 3,036 FMCSR codes by citation volume.
What is significant, however, is the out-of-service rate. Of the 6 all-time citations, 4 resulted in the vehicle being placed out of service—a 66.7% OOS rate. This is substantially higher than the all-FMCSR average of 31.4%, meaning inspectors are more likely to ground a truck for this violation than they are for the typical FMCSR code. The implication is clear: when inspectors catch this violation, they treat it as serious enough to take the vehicle off the road immediately.
Who gets cited most
Across our 180-day citation data, Illinois accounts for 1 citation with a 100.0% out-of-service rate. Because the citation volume for this code is very low overall, regional patterns are not as pronounced as with higher-volume violations. Our data shows fleets such as Walsh Construction Company and Delta Gases Inc have each received 1 citation all-time, but no carrier dominates this violation category. The rarity of citations means that the carriers cited represent a cross-section rather than a concentrated problem among any one fleet.
How severe is this compared to similar codes
Within the hazardous materials category, 177.840A sits in a lower-volume tier compared to closely related violations. For context, 177.834A—General loading/unloading hazmat—has 3,954 citations all-time with a 99.2% OOS rate. The 177.817(a) placard violation code has 2,274 citations with a 75.1% OOS rate. By contrast, the peer code 172.602(c)(1)—Maintenance/accessibility of Emergency Response information—shows 1,464 citations all-time with a 0.0% OOS rate.
This comparison is instructive. While emergency response information violations in general (172.602) are issued more frequently but rarely result in OOS, the 177.840A variant—no emergency response info at all—is cited far less often but is nearly twice as likely to result in being placed out of service. That gap suggests inspectors view a complete absence of emergency response documentation as more dangerous than maintenance or accessibility problems with information that is present.
How to avoid it
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Verify emergency response information is onboard before every trip. Do not rely on memory or past trips. Check that your emergency response documentation—typically the shipping papers and placards—is physically present in the cab or document holder, not in a trailer that may be separated or left behind.
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Cross-check hazmat loads against your documentation at pickup. When you accept a load marked as hazardous material, confirm that the emergency response information package matches the cargo manifest. If something is missing or unclear, refuse the load or have the shipper provide the required documents before departure.
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Keep emergency response materials accessible during the entire trip. Do not store required documents in a locked compartment or in the sleeper cab where an inspector cannot quickly locate them. They must be in your immediate work area and visible upon request.
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Understand what counts as emergency response information for your specific load. Different hazmat classes require different information. If you transport multiple classes, ensure you have the right documentation for each. When in doubt, contact your dispatcher or safety team before rolling.
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Inspect your placards and markings for accuracy and visibility. Our co-occurring violation data shows that drivers cited for 177.840A also frequently have missing or defective emergency equipment. A complete pre-trip inspection—including verification that placards are present, legible, and correctly reflect the load—reduces your overall hazmat violation risk.