An out-of-service (OOS) rate is the percentage of inspections in a category that had at least one OOS violation. On a SAFER Company Snapshot, divide the Out of Service count by the Inspections count in the same column—vehicle by vehicle, driver by driver—then read the result with the 24-month period shown. It is a prompt for further review, not a carrier safety grade.
Locate the correct motor carrier in HaulFacts lookup first. The rate only has meaning when it belongs to the USDOT entity you are assessing.
How do you calculate a vehicle or driver OOS rate?
SAFER Company Snapshots show Inspections, Out of Service, and Out of Service % in separate vehicle, driver, hazardous materials, and, when applicable, IEP columns. Use the inspection count from the same column as the OOS count. The total inspection count is not necessarily the sum of those columns because one roadside inspection can cover more than one category. Count inspections with an OOS finding, not individual violations: one inspection can have several OOS violations.
The Snapshot labels its U.S. inspection results as covering the 24 months before a displayed date. SAFER says inspection and crash counts update weekly. Record the date printed above the table as well as the date you checked it. If you compare with the displayed national average, check that its category and as of date match what you intend to compare.
Separate driver and vehicle contexts when the source does. A vehicle OOS finding may lead to maintenance questions; a driver OOS finding may lead to a different review. Neither one tells you by itself who is actually tendering a load today.
A cautious reading method
- Confirm the USDOT number so you do not read a similarly named carrier.
- Record the OOS count and total relevant inspection count.
- Note the source’s reporting period and retrieval date.
- Compare like-for-like categories only if a reference rate is shown.
- Review the underlying inspection pattern, material violations, and any company explanation under your internal procedure.
Worked example: reading the SAFER inspection fields
Illustrative only; these are invented counts, not a carrier record. Imagine you review a matching SAFER Snapshot on September 23, 2026 and it labels its U.S. inspection results “24 months prior to September 16, 2026.” Your review note could read:
| Field to record | Illustrative value | What it tells you |
|---|---|---|
| Source and checked date | SAFER Company Snapshot, September 23, 2026 | When and where you read the values |
| Inspection period end | September 16, 2026 | End of the displayed 24-month window |
| Vehicle inspections | 10 | Denominator for vehicle OOS rate |
| Vehicle out of service | 1 | Numerator: one inspection with at least one vehicle OOS violation |
| Vehicle out-of-service % | 10% | 1 ÷ 10 × 100 |
| Driver inspections / out of service | 16 / 0 | A separate driver denominator and numerator; driver OOS rate is 0% |
The 10% vehicle rate comes from only ten applicable inspections. It does not establish whether the tractor planned for a load has a current defect. The zero driver OOS count describes this displayed inspection history; it does not certify every driver. Keep the counts with the rates so a later reviewer can see their scale.
Avoid three common shortcuts
Do not call a carrier “safe” because a rate is low. Do not call it unsafe solely because a rate is above a comparison figure. A missing or zero result does not prove there were no relevant events. It may reflect limited inspection history, timing, or display conditions. If a category has zero inspections, there is no meaningful rate to calculate for that category, even if a page renders a zero or blank percentage.
An OOS rate also differs from an active federal out-of-service order. If a source shows an entity is under an order, that is a status requiring immediate careful review. A historical inspection rate is a summary statistic, not that legal/status determination.
Use OOS information as one lane in a review
Pair the summary with inspection history, the formal carrier safety rating if present, and practical booking checks. Identity, authority, and shipment-specific insurance remain separate tasks. FMCSA’s public systems distribute different information across views; use the official Snapshot for its OOS summary and preserve its date.
If your procedure uses thresholds, retain the underlying numbers beside the threshold outcome. A later reviewer then has enough context to see whether a small sample, a date range, or a category difference drove the escalation.