What 387.303B4 means in plain language
387.303B4 addresses requirements for drivers' vehicle inspection reports and record-keeping. Specifically, this code involves ensuring that drivers complete and maintain proper documentation related to pre-trip inspections and vehicle condition reports as mandated under FMCSR regulations.
When an officer cites you for 387.303B4, they've found that your inspection documentation—or the process by which you reported vehicle defects—didn't meet federal standards. This might mean a missing report, incomplete entries, failure to sign off on inspection results, or gaps in how defects were recorded and communicated to your carrier or maintenance team.
Unlike some FMCSR violations, 387.303B4 is not an out-of-service violation. That means the officer won't order your vehicle off the road or your logbook suspended on the spot. However, it still goes on your record and can affect your safety rating and future roadside interactions.
What our enforcement data actually shows
Across our database of 13 million real roadside inspection records, 387.303B4 ranks #583 out of 3,036 FMCSR codes by citation volume. In the last 12 months, we've recorded 988 citations nationwide. Over the last 90 days, that number was 220 citations.
The out-of-service rate for 387.303B4 is exceptionally low: just 1.9% of all citations (32 out of 1,646 all-time) resulted in the vehicle being placed out of service. To put that in perspective, the all-FMCSR average out-of-service rate is 31.4%—meaning 387.303B4 is cited but rarely results in an immediate roadside enforcement action that halts your operation. This reflects the administrative nature of the violation: officers are documenting a paperwork or reporting gap, not a critical safety defect.
The citation trend over the last 12 months shows consistent monthly volume between 52 and 108 citations, with peaks in May 2026 (108 citations) and February and March 2026 (99 and 95 citations respectively). April 2026 data is partial, showing only 3 citations as of the reporting snapshot.
Who gets cited most
Our data from the last 180 days shows Texas dominates the citation count: 362 citations, with 17 resulting in out-of-service status (4.7% OOS rate). New Mexico follows with 34 citations but zero out-of-service placements (0.0% rate). North Carolina ranks third with 31 citations, also with a 0.0% OOS rate.
The variation in OOS rates across these states is notable. Texas's 4.7% rate is substantially higher than New Mexico's and North Carolina's 0.0% rates, suggesting either stricter enforcement interpretation in Texas or different documentation practices among fleets operating in that region.
Our inspection records show fleets such as Federal Express Corporation (USDOT 86876), Atey Trucking LLC (USDOT 4409682), and US Xpress Inc (USDOT 303024) each accounting for 6 citations in our all-time data. This reflects the scale of these carriers' operations rather than a pattern of systemic non-compliance; large fleets naturally encounter more roadside inspections.
How severe is this compared to similar codes
387.303B4 sits within the General/Admin category of FMCSR violations. When we compare it to peer codes in the same category, the contrast is stark.
390.21TB2-DOT, a related marking requirement code, has 74,663 citations all-time with a 0.0% out-of-service rate. 390.21T(b) shows 61,097 citations, also 0.0% OOS. Even 390.19B2-BIENNIAL, a biennial inspection marking violation, has logged 16,142 citations with only 0.2% OOS rate.
In raw volume, 387.303B4's 1,646 all-time citations place it well below these peer codes—roughly 2% of the citation volume of 390.21TB2-DOT. The OOS rate comparison reinforces that 387.303B4 violations are treated as administrative oversights rather than critical safety failures, consistent with the documentation-focused nature of the code.
How to avoid it
Our co-occurring violation data reveals patterns. The code most frequently appears alongside 392.9AA1 (72 shared inspections in the last 90 days), followed by 393.9 inoperable lamp citations (67 inspections), windshield defects (57 inspections), and driver fatigue violations (56 inspections).
This clustering suggests that 387.303B4 citations often occur during broader safety inspections where multiple vehicle or driver issues are documented. The co-occurrence with vehicle defect codes—brake tubing, slack adjusters, fire extinguishers—indicates that drivers may be failing to report known defects on inspection forms.
Here's how to prevent a 387.303B4 citation:
-
Complete your pre-trip inspection thoroughly and document every finding. Don't skip steps or leave blanks on your vehicle inspection report (VIR). If a component works correctly, note that. If you find a defect, describe it clearly—location, severity, what's wrong.
-
Report defects to your carrier immediately, in writing. Many citations occur because drivers discover issues but don't formally communicate them. Use your carrier's defect reporting system—text, email, or app—and keep a copy. This creates a paper trail proving you flagged the problem.
-
Sign and date every inspection form. Officers check for signatures. An unsigned or partially completed VIR is a citation waiting to happen.
-
Match your report to your vehicle's actual condition. Don't guess or rush through the inspection. Freightliner (451 citations in our data), Kenworth (215), and Peterbilt (168) trucks are most commonly cited for 387.303B4, likely because they're the most common vehicles on the road—but the principle applies to any make: be honest and precise.
-
If your carrier hasn't assigned you a formal VIR process, ask for one. Some smaller operations still use paper forms; others use electronic systems. Know which applies to you and follow it exactly.
-
Keep inspection forms on hand during your shift and at vehicle pull-ins. Inspectors may ask to see recent reports. If you can't produce them, you've invited scrutiny.
The low out-of-service rate means this is a fixable violation—but it still counts against your safety record. A few minutes of care at pre-trip time eliminates the risk entirely.