What is FMCSA?
The Federal Motor Carrier Safety Administration (FMCSA) is the agency within the Department of Transportation responsible for regulating commercial motor vehicles in interstate commerce. FMCSA issues operating authority to carriers, conducts compliance reviews, and publishes safety data for every registered motor carrier in the US.
Every commercial motor carrier operating in interstate commerce must register with FMCSA and receive a USDOT number. This number is the primary identifier for a carrier in FMCSA systems — and the most reliable way to look up a transportation vendor's safety record.
FMCSA safety ratings explained
FMCSA assigns safety ratings following a compliance review (on-site or off-site investigation of a carrier's operations). There are three possible ratings:
| Rating | What it means | Implication for buyers |
|---|---|---|
| Satisfactory | Carrier has adequate safety management controls in place | Baseline standard — does not indicate outstanding performance |
| Conditional | Carrier has some safety management controls but significant deficiencies were found | Elevated risk — carrier may remain operational but requires monitoring |
| Unsatisfactory | Carrier lacks adequate safety management controls; is operating in violation of federal safety regulations | High risk — an unsatisfactory carrier is subject to operations shutdown |
| Not Rated | Carrier has not had a compliance review | Most carriers are not rated — no rating does not mean clean record; review SMS data |
Important: Most carriers have no safety rating at all. A "Not Rated" status is normal and does not indicate a problem. Focus instead on the Compliance, Safety, Accountability (CSA) scores and out-of-service order history.
What is an out-of-service order?
An out-of-service (OOS) order is an immediate enforcement action issued by a federal or state inspector when a carrier, driver, or vehicle has a critical safety violation that presents an imminent hazard. The carrier or vehicle is prohibited from operating until the violation is corrected.
OOS orders are issued at roadside inspections, compliance reviews, or following crashes. Common reasons include: brake failure, hours-of-service violations, driver disqualification, or hazardous materials violations.
A carrier with a pattern of OOS orders — particularly vehicle OOS orders — signals systematic failure in maintenance and compliance management. For a buyer, this is a direct operational and liability risk.
OOS rates — what the numbers mean
FMCSA publishes OOS rates for carriers: the percentage of inspections that resulted in an OOS order. National averages provide a benchmark:
| Category | National average OOS rate (approx.) | Concern threshold |
|---|---|---|
| Driver OOS | ~5% | Above 6% — flagged in FMCSA SMS |
| Vehicle OOS | ~20% | Above 21% — flagged in FMCSA SMS |
| Hazmat OOS | ~4% | Above 4.5% — flagged in FMCSA SMS |
How KnowVendor surfaces FMCSA data
KnowVendor links FMCSA carrier records to legal entities using the USDOT number — a deterministic identifier that directly identifies the registered carrier. Carrier profiles include operating status, safety rating, OOS history, and the census data on file with FMCSA.
For carriers that are also registered federal contractors, the FMCSA profile is linked to the SAM entity record via shared identifiers — giving you a combined view of federal registration status and transportation safety record in one place.
Red flags to look for
- Unsatisfactory safety rating — do not engage until the rating is upgraded
- Active OOS order on the carrier — carrier cannot legally operate interstate
- OOS rate significantly above national average — systematic maintenance or compliance issues
- Inactive operating authority — carrier's federal authority has been revoked or lapsed
- Recent crash data — review number of crashes per million miles in the carrier snapshot
FMCSA data in context
FMCSA data applies specifically to motor carriers — trucking companies, freight brokers, and passenger carriers. For non-transportation vendors, FMCSA is not relevant. For transportation vendors, it is one of the most important signals available because it comes directly from federal inspections of actual operations.
Combine FMCSA data with OSHA inspection history for a complete picture of a logistics or construction vendor's safety culture. See the due diligence checklist for a full workflow.