397.7B-HMDP Hazmat Parking Violation: Driver Q&A

No. Across our inspection records, this violation has never resulted in an out-of-service order—the OOS rate is 0.0%. Of the 20 all-time citations for 397.7B-HMDP in our database, all 20 were issued but the vehicle was allowed to continue operating. For context, the national average OOS rate across all FMCSR codes is 31.4%, so hazmat parking violations are treated more leniently than many other violations in terms of immediate roadside enforcement.

This violation carries a CSA severity weight of 6 points. The actual impact on your Safety Management System (SMS) score depends on when the citation was issued and your carrier's violation history in the past 12 months. Within a 30-day period, this single citation counts once; after 30 days, it may drop off or roll off depending on FMCSA's rolling 24-month window. Check your carrier's Safety Snapshots in FMCSA's CSA portal to see the real-time point accumulation.

First, document the citation and ticket details. Second, check your cargo—confirm you're parked in a compliant location per DOT hazmat rules (placards, distance from populated areas, restricted zones). Third, if you were also cited for emergency warning devices (our data shows these co-occur in 3 out of 4 recent inspections of this code), inspect and place all triangles/flares immediately. Finally, notify your carrier's safety department so they can file a DataQs challenge if the citation contains factual errors, such as incorrect cargo classification or location details.

Not as serious in enforcement terms. While this parking violation is rarely out-of-service (0.0% OOS rate), other hazmat violations in the same category are far more aggressive: general loading/unloading violations average 97.9–99.2% OOS rates, and placarding violations average 75.1% OOS. Our records show 397.7B-HMDP ranks 1938th out of 3,036 FMCSR codes by citation volume, indicating it is enforced infrequently. The 6-point CSA weight is moderate but not extreme.

Yes. The DataQs (Roadside Data Quality Reporting System) allows you or your carrier to challenge citations within 90 days of issuance. Focus on factual disputes: Was the cargo actually hazmat? Was the parking location truly unauthorized per the specific regulations? Was the placard displayed correctly? Documentation-based errors (missing logs, incorrect placards) are contestable. Equipment or behavior observations by the inspector are harder to overturn but can be challenged if the inspector's notes contradict your photographic or logbook evidence.

Over the last 180 days, our inspection records show Louisiana leads with 7 citations, followed by Maryland with 1 citation and New Hampshire with 1 citation. Louisiana accounts for the overwhelming majority of recent enforcement activity for this violation. If you operate hazmat loads in Louisiana, extra attention to designated parking areas and company lot authorization is critical to avoid this citation.

Moderate urgency, but not emergency. The 0.0% OOS rate means you won't be sidelined on the road, and the citation won't trigger immediate vehicle impound. However, recent enforcement activity (4 citations in the last 90 days) shows inspectors are still watching. Correct the parking practice immediately with your carrier: confirm authorized lots, maintain distance rules, display placards, and mark hazmat parking zones. Repeat citations will compound CSA points and trigger carrier audits.

This violation follows the carrier primarily through the Hazmat Compliance BASIC in the FMCSA Safety Management System. Hazmat violations are carrier-level concerns because they reflect fleet-wide procedures and lot management policies. Individual driver records do capture citations, but the CSA safety metric is calculated at the carrier level. Your carrier's hazmat policies, authorized parking zones, and training documentation are what inspectors assess. Repeat citations under your driver ID may trigger a review of your personal hazmat qualifications as well.