FMCSR 393.75A4: Tire-Cut Exposing Ply—Driver Q&A

Not automatically. Across our inspection database, 393.75A4 resulted in an out-of-service order in only 18.3% of cases—meaning 81.7% of drivers cited for this violation were allowed to continue. That's significantly lower than the all-FMCSR average OOS rate of 31.4%. However, the decision depends on the inspector's judgment about the severity and safety risk of the cut. Stay alert: Texas citations show a 10.7% OOS rate, but North Carolina shows 83.3%—geography and inspector interpretation matter.

The specific point weight for this violation is not publicly disclosed by FMCSA in standard CSA documentation. However, the citation itself will be recorded in your carrier's CSA Violations BASIC, affecting your percentile score. The severity and point multiplier depend on which CSA violation category it falls under and whether it occurred during a critical event. Contact your carrier's safety department or your FMCSA Safety Management Consultant (SMS) to see exactly how this citation impacts your company's profile.

First: document the citation fully and notify your dispatcher and safety manager immediately. Second: examine your tires closely—our data shows 393.75A4 commonly co-occurs with other maintenance issues like inoperable lamps (94 shared inspections) and windshield defects (59 shared inspections). Perform a full walk-around inspection. Third: schedule tire replacement or repair with your carrier's maintenance before your next dispatch if possible. Fourth: if you believe the citation is inaccurate, document photos and gather evidence for a DataQs (Clearinghouse) challenge within 90 days of the inspection date.

It's moderately serious. The 18.3% OOS rate for 393.75A4 is lower than the all-FMCSR average of 31.4%, putting it below mid-range severity. However, among peer vehicle maintenance codes, tire defects trend serious: 393.75C (insufficient tread depth on other axles) frequently co-occurs (50 shared inspections in the last 90 days), and tire failures are safety-critical. Unlike documentation violations like 396.17C (0% OOS rate), equipment failures like yours carry real out-of-service risk and require immediate corrective action.

Yes, you can challenge it through the FMCSA's DataQs (Clearinghouse) system within 90 days of the inspection. DataQs challenges are strongest when the inspection finding is disputed on factual or procedural grounds—for example, if the tire was not actually cut, or if the inspector failed to follow proper measurement protocols. Submit your challenge with supporting evidence: photos of the tire, maintenance records, or testimony from a qualified mechanic. Document the exact condition at time of inspection. Note that safety violations are more thoroughly scrutinized than paperwork violations, so have clear evidence ready.

Our inspection records show Texas dominates 393.75A4 citations by far. Over the last 180 days, Texas accounted for 617 citations—roughly 94% of all top-state volume. North Carolina followed with 12 citations (83.3% OOS rate, the highest we see), and New Mexico with 6 citations. This concentration reflects higher inspection activity in Texas border regions and freight routes, and suggests fleet operations in that region face elevated risk of this citation.

Urgent. Over the last 90 days, we recorded 293 citations for this violation, with an average 18.3% out-of-service placement rate—meaning roughly 1 in 5 drivers cited are sidelined until repair. Monthly trends show consistent enforcement: July through February averaged 121 citations per month. A cut exposing ply or belt material is a safety hazard that worsens under load and heat. Most carriers will not permit continued operation; even if an inspector doesn't pull you OOS, your company's safety protocol likely requires immediate replacement. Repair within 24 hours if possible.

In FMCSA's CSA system, the violation is recorded against the carrier's Safety and Maintenance BASIC, not the individual driver. However, the inspection event itself is tied to that specific vehicle and date. If you move to another carrier, the citation stays with your previous employer's CSA history; it does not follow you personally. That said, roadside inspection records are public, and your driving record may reflect the violation in your personal file. Ensure your new carrier has access to accurate inspection history when you apply—it protects both you and your next employer.