FMCSR 172.504A: Placarding Table 1 Hazmat — What Happens Now

Yes—over half the time. Across our inspection records, 172.504A resulted in an out-of-service placement in 51.4% of all citations (268 out of 521 all-time). That's 20 percentage points higher than the FMCSR average OOS rate of 31.4%. However, nearly half (253 citations) were not placed OOS, so inspectors have discretion based on the specific load and placard deficiency. If you've been cited, ask the inspector whether a repair-and-reinspect option is available before your truck is ordered off the road.

172.504A carries a CSA severity weight of 8 points per citation. This is a moderate-severity violation under the FMCSA's points system. A single citation will add 8 points to your Safety Management Cycle score; if you receive multiple citations within 30 days, each adds 8 points independently. The points remain on your record for 36 months. For context, hazmat placarding failures are taken seriously because they affect emergency responder safety, so the weight reflects that importance even though this code itself does not automatically trigger an out-of-service order.

1. Photograph the load and placard before any corrections; document the specific violation cited.
2. Check your placarding again against the hazmat table for the material—ensure all four sides are covered if required, and placards are legible and the right color/format.
3. Inspect tires, lamps, and brakes immediately. Our data shows 172.504A often co-occurs with tire defects (15 shared inspections in the last 90 days), inoperable lamps (11 shared), and brake issues (11 shared)—fixing these now prevents stacking violations.
4. Ask the inspector for a waiver or reinspection opportunity before leaving the roadside if OOS is threatened.
5. Contact your carrier's safety team and report the exact citation language and whether you were placed OOS.

Yes, it is serious, but less severe than similar violations. Our records show 172.504A has a 51.4% OOS rate. Compare that to other placarding codes: 177.817(a) (placarding violation general) sits at 75.1% OOS, and the two general loading/unloading codes (177.834A-HMC and 177.834(a)) spike to 99.2% and 97.9% OOS respectively. On the other hand, 177.817(e) (placard deteriorated/damaged) is only 5.2% OOS, and 172.516(c)(6) (placard obscured) is just 1.6% OOS. Your citation falls in the middle-upper range because failure to placard at all—regardless of quantity—is considered a high-hazard omission.

Possibly, but it depends on the type of deficiency. If the citation is based on an inspector's observation of a missing or illegible placard, you can file a DataQs (FMCSA Driver Record Evaluation Query) challenge if you can provide documentation—such as photos, shipping papers, or carrier records—proving that the placard was present and compliant at the time of inspection. However, if the violation is documented by a photograph taken during the inspection or the physical placard was genuinely missing from the vehicle, a successful challenge is much harder. Consult your carrier's compliance team or a transportation attorney within 30 days of the citation to evaluate your specific evidence and DataQs eligibility.

Texas leads by a wide margin. In the last 180 days, our records show Texas accounted for 137 citations with a 67.9% out-of-service rate (93 OOS placements). New Mexico follows with 9 citations at 66.7% OOS, and North Carolina third with 8 citations at 37.5% OOS. Texas alone represents more than 90% of all citations for this code in the last six months, suggesting concentrated hazmat shipping corridors through the state or enhanced enforcement focus on placarding compliance in that region.

Very urgent. Our 90-day trend shows a spike: 80 citations in the most recent quarter, with February 2026 alone recording 43 citations (26 OOS). This is the highest monthly volume we've seen in the trailing 12 months, indicating either increased inspection activity or a genuine rise in violations. Combined with the 51.4% all-time OOS rate, waiting to fix placard deficiencies increases your risk of roadside enforcement and order-out-of-service events. If you haul Table 1 hazmat regularly, audit your placarding procedures now and verify every vehicle before dispatch.

Both. The FMCSA records CSA violations against the carrier's USDOT number (affecting the carrier's Hazmat CSA BASIC and overall safety profile) and against your driver record (affecting your personal Safety Management Cycle). This is why fleet safety managers care: Greenwood Motor Lines Inc (USDOT 63391) has 11 all-time citations for this code—the highest of any carrier in our database—which compounds their hazmat-related risk profile. A single driver citation contributes to the carrier's aggregate, so if you're cited, your carrier's CSA percentiles will be impacted alongside your own.