178.503-HMP Citations: What Drivers Need to Know

No. Across our 13 million inspection records, 178.503-HMP has never resulted in an out-of-service order. The OOS rate is 0.0%—all 9 citations on record were issued as warnings or violations without removal from service.

For context, the national average OOS rate across all FMCSR codes is 31.4%, so this violation sits well below the threshold for immediate vehicle impoundment. However, that doesn't mean you can ignore it—hazmat violations still carry compliance weight.

178.503-HMP is relatively minor within the hazmat category. Our data shows comparable hazmat codes like General Loading/Unloading (177.834A) carry a 99.2% OOS rate, and Placarding Violations (177.817A) hit 75.1%. By contrast, 178.503-HMP has never triggered an out-of-service order in our 13 million-record database.

It ranks #2230 out of 3,036 FMCSR codes by citation volume, indicating it's uncommon. The low enforcement frequency and zero OOS history suggest inspectors view this as a lower-severity issue than core hazmat loading or placarding failures.

Take these steps right away:

1. Document the citation details — date, location, inspector name, and specific findings.
2. Review your cargo and vehicle — our data shows 178.503-HMP often appears alongside placarding violations (177.817A) and packaging issues (173.24B1), so audit those areas.
3. Check your CDL endorsements — one co-occurrence pattern included CDL endorsement violations (383.23A2), confirming you hold the right hazmat credentials.
4. Preserve evidence — photos, load manifests, and inspection reports support a DataQs challenge if needed.
5. Report to your carrier — this citation affects carrier safety metrics and CSA scores.

178.503-HMP ranks #2230 out of 3,036 FMCSR codes by all-time citation volume. Only 9 citations have been issued across our entire 13 million-inspection database, with just 4 in the last 12 months and 3 in the last 90 days.

This rarity suggests either that compliance with this regulation is strong, inspectors interpret enforcement narrowly, or the violation type is uncommon in real-world operations. By volume alone, you're dealing with one of the least-cited violations in the commercial trucking safety system.

Yes, you can challenge the citation through the FMCSA's DataQs (Docket Query System), which allows drivers and carriers to dispute inaccurate or incomplete safety records. Success depends on your specific facts.

If the citation was issued in error—wrong vehicle, wrong date, or inspector misidentified the violation—DataQs is your path to removal. If the violation is factually accurate but you believe the inspector applied the regulation incorrectly, gather supporting documentation (cargo manifests, load photos, compliance records) and submit your case with a clear narrative. The FMCSA will investigate within 30 days.

Our inspection records from the last 180 days show 178.503-HMP citations in three states, with one citation each:

• Kentucky (KY) — 1 citation, 0 OOS
• Oklahoma (OK) — 1 citation, 0 OOS
• Pennsylvania (PA) — 1 citation, 0 OOS

The distribution is extremely sparse, reflecting the low overall enforcement volume. This violation appears almost randomly across regions rather than clustering in any particular state's inspection program.

Lower urgency than most hazmat violations, but don't delay. With zero out-of-service orders across 9 all-time citations, this isn't a safety stop that grounds your vehicle. However, the citation still generates CSA points and becomes part of your carrier's compliance record.

The 90-day trend shows 3 citations recently (up from sporadic enforcement), which could signal increased inspector focus. Fix the compliance issue within 30 days and document your corrective action. This prevents the violation from rolling into future inspections and compounds your safety profile.

Our all-time data shows 178.503-HMP citations distributed across 9 different carriers, each with just 1 citation on record. They include XPO Logistics Freight Inc, BNSF Railway Company, Bio Clinical Laboratories, Solid Ground Concrete Incorporated, Auto Line Express Inc, Kundi LLC, Quinn and Feiner Service Co Inc, Matrix Logistics Inc, and Gold Stallion Services Corp.

No carrier dominates the violation history, confirming it's rare and scattered across the industry. This suggests the violation is tied to specific operational circumstances rather than a systemic compliance failure in any one company.