What 177.848D means in plain language
This citation addresses the rules governing which hazardous materials can and cannot be loaded, transported, or stored together. The federal hazmat regulations maintain strict compatibility tables that specify which chemicals, gases, liquids, and solids are prohibited from being in the same vehicle, container, or storage area at the same time. Some materials are chemically reactive with each other; others pose fire or explosion risks when combined; still others can contaminate one another and become unusable or dangerous.
When you receive a 177.848D citation, it means an inspector found evidence that two or more incompatible hazardous materials were being transported or stored together in violation of those compatibility rules. This isn't about paperwork or placards—it's about the actual physical cargo arrangement.
What our enforcement data actually shows
Our inspection records show this violation is relatively uncommon in absolute terms: across our 13 million roadside inspections, we've recorded only 5 all-time citations for 177.848D. In the last 12 months, we logged 4 citations, with 1 citation in the most recent 90-day period. Despite the low volume, this code carries serious enforcement weight: 4 out of 5 all-time citations resulted in an out-of-service order, producing an 80.0% OOS rate. That's significantly higher than the all-FMCSR average of 31.4%, meaning inspectors treat this violation as a safety-critical defect more than half the time above the baseline.
Ranked #2406 of 3,036 FMCSR codes by citation frequency, 177.848D sits in the lower volume tier. However, its OOS rate tells the real story: when cited, it triggers enforcement action at more than double the average rate.
Who gets cited most
Over the last 180 days, Texas accounts for 2 citations, both of which resulted in out-of-service orders (100.0% OOS rate). Our data shows no other states with citations in that recent window, indicating regional variation in either enforcement intensity or hazmat routing patterns.
Across all-time records, our carriers database shows single citations distributed among five different motor carriers, including fleets such as SAIA Motor Freight Line LLC and Terrabella Environmental Services Inc. The lack of concentration across carriers suggests this violation isn't endemic to any particular fleet type, but rather occurs sporadically across the industry.
How severe is this compared to similar codes
This violation operates in the hazardous materials loading and storage category. Peer codes in the same regulatory family show markedly different enforcement patterns:
- 177.834A-HMC (General loading/unloading hazmat) has triggered 3,954 citations with a 99.2% out-of-service rate—indicating it is far more frequently cited and even more likely to result in a vehicle being pulled from service.
- 177.823(a) (Movement of damaged hazmat packages) has 1,829 all-time citations with a 51.8% OOS rate—roughly on par with or below 177.848D's severity in enforcement.
- 172.502(a)(1) (Placarding general requirements) shows 1,820 citations but only an 18.5% OOS rate, suggesting paperwork-level hazmat violations are treated more leniently than cargo compatibility issues.
The contrast is stark: 177.848D's 80% OOS rate places it well above the category average and indicates inspectors view incompatible cargo combinations as a concrete safety hazard requiring immediate removal from service.
How to avoid it
Preventing a 177.848D citation requires understanding hazmat compatibility before you load:
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Review your shipping papers against the hazmat compatibility tables. Before accepting a load with multiple hazmat commodities, cross-check the hazard classes, packing groups, and UN proper shipping names against the DOT compatibility matrix. If two items are listed as incompatible, refuse to co-load them. Our data shows citations frequently co-occur with placarding violations (172.502A1 and 172.504A), indicating drivers may not be verifying the actual cargo against placard information.
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Verify packaging integrity at load time. A secondary pattern in our citations shows co-occurrence with 173.24C (Packaging not authorized by Hazardous Materials Regulations) and 173.24B1 (Release of Hazardous Materials from package). Even compatible materials can become incompatible if containers are damaged or leaking. Inspect each hazmat package for damage, leaks, or evidence of deterioration before loading.
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Separate incompatible materials physically and procedurally. If your load includes hazmat of different classes, confirm they meet minimum separation distances or are in properly segregated compartments. Vehicle makes cited for this violation (VOLV and FREIGHTLIN dominate our records) are standard commercial rigs, so engineering is not the issue—planning and verification are.
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Document your pre-trip hazmat review. Walk through the bill of lading or shipping papers with the shipper or dispatcher. Confirm you understand what you're carrying and that all items on the truck are compatible. This paper trail protects you if a citation is later disputed.
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Request hazmat refresher training if you handle mixed commodities. Our data shows 80% of citations result in out-of-service orders, which can strand you, damage your safety record, and trigger carrier-level audits. Investing in formal hazmat loading training now prevents that outcome.