172.504(a) Placarding Table 1 Hazmat — Citations & Out-of-Service Rate

Yes, but not automatically. Across our inspection database, 44.6% of 172.504(a) citations result in an out-of-service (OOS) order. That's higher than the all-FMCSR average of 31.4%, meaning this violation is taken seriously by enforcement. The other 55.4% of citations (775 out of 1,399 total) do not trigger immediate OOS. Whether you'll be placed out of service depends on the specific circumstances the inspector documents—severity of the placarding failure and vehicle condition are factors.

The violation carries a CSA severity weight of 8, which is how FMCSA scores the violation itself. Your actual CSA points depend on the 30-day summary period. If this is your first such violation in 30 days, 8 points are added to the Hazmat Compliance BASIC. If multiple violations occur within the same rolling 30-day window, each adds 8 points, so they stack. The severity weight reflects that failing to placard high-hazard materials poses significant public safety and environmental risk.

First, get a copy of the inspection report and read what specific placards were missing or defective. Second, verify your hazmat shipping papers match what you're carrying and confirm Table 1 materials are correctly identified. Third, if you were placed OOS, do not move the vehicle until the violation is corrected and re-inspected. Fourth, contact your company's safety team or dispatcher to document the correction and schedule a compliance inspection. If you believe the citation is factually wrong, you may submit a DataQs (Databus Query System) challenge through your carrier within 90 days.

Yes. While 172.504(a) has the 44.6% OOS rate, some peer hazmat violations are far more severe. Loading/unloading violations (177.834A-HMC) hit 99.2% OOS; general placarding violations (177.817(a)) reach 97.9% OOS. On the other end, placard maintenance violations (177.817(e)) sit at 5.2% OOS. The 172.504(a) OOS rate of 44.6% puts it in the moderate-to-serious range—above average for all FMCSR codes (31.4%), but not the absolute highest in hazmat. The issue is that Table 1 materials are high-hazard by definition.

Yes. The FMCSA DataQs (Databus Query System) allows drivers and carriers to challenge roadside inspection records. You have 90 days from the inspection date to submit a query if you believe the inspector made a factual or administrative error—for example, if you believe the vehicle actually had the correct placards, or if the materials being transported were not Table 1 hazmat. DataQs does not overturn judgment calls about inspector conduct, but it does address factual disputes. Work with your carrier's safety or compliance team to submit evidence (shipping papers, photos, placarding records) supporting your challenge.

Our 13 million+ inspection records show 1,399 citations for 172.504(a) all-time. The top carriers cited are Greenwood Motor Lines Inc (39 citations, USDOT 63391), XPO Logistics Freight Inc (25 citations, USDOT 241829), and Old Dominion Freight Line Inc (17 citations, USDOT 90849). By vehicle make, Freightliners dominate the data with 164 citations, followed by Peterbilts (58) and Kenworths (51). The violation ranks #632 out of 3,036 FMCSR codes overall, so it's not the most common, but it is concentrated among certain large carriers and freight equipment types.

Very urgent if you were placed out of service—you cannot legally operate until corrected. Notably, our database shows zero citations for 172.504(a) in the last 12 months and last 90 days, which suggests either enforcement focus has shifted or industry compliance has improved significantly. Historically, 1,399 citations have been issued all-time. That trend means if you're cited now, it signals the inspector or your company's compliance posture drew scrutiny. Do not delay correction and reinspection. Placarding is a non-negotiable hazmat safety requirement.

The violation attaches to both. The driver bears immediate responsibility because operating a vehicle with incorrectly placarded hazmat is a personal safety and legal violation. However, CSA points roll up to the carrier's safety record under the Hazmat Compliance BASIC, affecting the company's FMCSA rating and insurance. Repeat violations at a carrier level can trigger audits, increased premiums, and eventually enforcement action against the company. So while you receive the citation, your carrier's compliance program is also measured on the aggregate.