Understanding the FMCSA Data Sources Behind This Site
Every figure on a CarrierPedia carrier profile traces back to a specific public FMCSA dataset, published through the U.S. Department of Transportation's open data platform. Rather than treating carrier data as one undifferentiated blob, it's worth understanding that it actually comes from several separate systems, each maintained on its own schedule and covering a different slice of a carrier's record. See Data Sources for the exact dataset list this site draws from, including the specific dataset identifiers and refresh cadence.
The registration layer: Company Census
This is the foundational dataset — the record created and updated through each carrier's MCS-150 filings, covering legal and DBA name, address, fleet composition, driver counts, and cargo types. Nearly every other part of a carrier profile references back to this dataset for basic identifying and operational details. See MCS-150 Biennial Update for how this data stays current.
The safety layer: Safety Measurement System (SMS)
SMS data tracks carrier performance across the five BASIC categories, calculated from roadside inspection results. This is where measures, alerts, and — for a subset of carrier types — official percentiles come from. See What the Five FMCSA BASICs Actually Measure and How to Read an SMS Percentile for the details, including where CarrierPedia computes its own percentile to fill a gap in what FMCSA publishes for property carriers specifically.
The incident layer: crash and inspection data
Separate datasets track crash history and roadside inspection results in detail — the raw events that feed into the calculated SMS measures, but also useful on their own as a record of what actually happened. See How FMCSA Crash Reporting Works — and Its Known Gaps and Reading an Inspection Report: Levels 1–6 for what these datasets do and don't capture.
The authority layer: Licensing & Insurance (Motus)
A separate system tracks operating authority grants, status history, insurance filings, and revocation/suspension orders. This is where authority status and insurance-on-file information comes from, distinct from the safety datasets above — a carrier's authority and insurance status is tracked independently of its inspection and crash history. See Operating Authority: Active, Pending, Revoked and How to Check if a Carrier's Insurance Is on File.
Why these datasets update on different schedules
Registration, crash, and inspection data generally update daily at the source, while safety performance (SMS) data updates monthly, reflecting how frequently each underlying process actually generates new information. CarrierPedia's own refresh follows a schedule tied to these source cadences, and every profile shows when its data was last refreshed — see Data Sources for specifics.
Why we bring these together instead of linking out
FMCSA publishes all of this data, but not in one combined view — checking a carrier's full picture through FMCSA's own systems means visiting several different tools for registration, safety, and authority information separately. CarrierPedia's carrier profile exists specifically to bring these layers together in one place, with percentile and comparison context added on top, while always crediting which dataset each figure came from. See About for more on why this site exists and what it deliberately doesn't do.
Exploring a profile with this in mind
Next time you look up a carrier through DOT Number Lookup, it's worth noticing which section of the profile is drawing from which dataset — it makes the "why" behind each figure clearer, and makes it easier to judge how much weight a given number should carry.