Every motor carrier operating in interstate commerce leaves a paper trail with the Federal Motor Carrier Safety Administration. That trail covers registration, operating authority, insurance coverage, roadside inspections, crash involvement and, for a minority of carriers, a formal safety rating. All of it is public. Almost none of it is self-explanatory.
The difficulty is not access, it is interpretation. A percentile score that looks alarming may reflect nothing more than a small fleet with two inspections on file. An empty rating field usually means no compliance review has ever taken place, not that a carrier was found wanting. A lapsed insurance filing may be a clerical artefact or a genuine coverage gap, and the record alone does not always distinguish the two.
This guide walks through each record type in the order you would normally encounter it.
Carrier credentials
USDOT numbers, MC operating authority, entity types, and why a company can hold one without the other.
Read →Safety ratings
Satisfactory, Conditional, Unsatisfactory and Unrated — what triggers each and what it does not mean.
Read →BASIC percentiles
The seven behaviour categories, how peer grouping works, and why raw counts mislead.
Read →Insurance filings
BMC-91, BMC-34 and the thirty-day cancellation clock that catches people out.
Read →Where the data comes from
Three systems produce most of what you will see. The registration system holds identity and authority records. The Safety Measurement System aggregates roadside inspection and crash data into behaviour categories on a rolling twenty-four month window. The insurance system tracks filings submitted by insurers on the carrier's behalf.
These systems update on different schedules and do not always agree with one another at any given moment. A carrier whose authority was reinstated this morning may still appear inactive in a dataset refreshed last night. Treating a snapshot as final is the single most common source of confusion.
Three mistakes worth avoiding
- Reading percentiles as absolute scores. A BASIC percentile compares a carrier only against others with a similar inspection volume. It is a ranking, not a grade.
- Treating "unrated" as negative. The large majority of active carriers have never been through a compliance review, so they carry no rating at all.
- Assuming the record is current. Reporting lag varies by state and by dataset; several weeks is normal for inspection data.
Start here
If you have a specific record in front of you and want to work through it field by field, the walkthrough in How to read a carrier record follows a single example from identity through to inspection history. If you are new to the terminology, the glossary covers the abbreviations that appear throughout these pages.