From the day your authority went active, FMCSA has been keeping score on your fleet — seven scores, actually. CSA is the program that keeps them, the Safety Measurement System is the math behind them, and the BASICs are the seven categories every roadside write-up gets sorted into.
None of it is secret, but almost none of it is explained where an owner-operator would find it. Here is the whole scoreboard in plain English: where the data comes from, what each BASIC really measures, how a single violation becomes a percentile, who reads the number — and what's changing in 2026.
The program.
CSA is the enforcement program. SMS is the math. The BASICs are the scoreboard.
CSA — Compliance, Safety, Accountability — is FMCSA's program for deciding which of the hundreds of thousands of active carriers get enforcement attention. The agency cannot audit everyone, so it ranks. The engine doing the ranking is the Safety Measurement System (SMS): once a month it recalculates a safety picture for every carrier from the most recent 24 months of data.
Four feeds fill it. Every roadside inspection — including clean ones, which count in your favor. Every state-reported crash that meets the recordable bar. The results of investigations. And your own census data — the power units and mileage on your MCS-150 — which sets the exposure your record is judged against. If you want the mechanics of how one inspection ripples through the score, we walk that math step by step in the inspections track; and what flags a truck for inspection in the first place is its own story.
One disambiguation before the scoreboard: your CSA percentiles are not your safety rating. The rating — Satisfactory, Conditional, Unsatisfactory — is a formal verdict that only an investigation can issue. The percentiles are the early-warning system that decides who gets investigated.
The seven BASICs.
Every violation lands in exactly one bucket — and each bucket points at a different part of your operation.
BASIC stands for Behavior Analysis and Safety Improvement Category. Every violation code on an inspection report maps to exactly one of the seven, and each is scored on its own — a fleet can be spotless on maintenance and drowning in hours-of-service at the same time. The percentile pill on each card is the intervention threshold for property carriers: the line where FMCSA starts paying attention.
Unsafe Driving
Part 392
How your trucks are driven when they're moving — the behavior an officer can watch from the next lane. This is the BASIC most tightly correlated with crash risk, which is why its intervention line sits lowest.
Speeding, improper lane change, following too close, texting or a handheld phone, no seat belt.
Crash Indicator
Crash records · Not publicly displayed
Your state-reported crash history, weighted by frequency, severity, and recency. It records involvement, not fault — though a crash ruled Not Preventable through FMCSA's crash-preventability program is removed from the calculation.
Every DOT-recordable crash a state reports — a tow-away, an injury, or a fatality.
HOS Compliance
Part 395
The fatigue picture: whether the logs are right and the limits were respected. For small fleets, most of what lands here is paperwork, not exhaustion — an ELD not current, a missing certification, form-and-manner errors.
Log and ELD violations, driving past the 11-hour or 14-hour limits, false logs.
Vehicle Maintenance
Parts 393 · 396
The mechanical condition of the truck at the roadside — and nationally the biggest violation volume of any BASIC. Brakes lead the out-of-service statistics every year, which makes this the bucket a pre-trip habit protects most directly.
Brake defects, lights, tires, leaks, and cargo securement write-ups.
Controlled Substances / Alcohol
Part 382
Use or possession found at the roadside — alcohol in the cab, a driver who shouldn't be behind the wheel. Low volume, high severity: a single line here says more than a dozen light violations elsewhere.
Roadside alcohol/drug possession or use findings; program failures surface in investigations.
Driver Fitness
Part 391
Whether the person in the seat is qualified to be there on paper: license, endorsements, medical certificate. Nearly everything here is preventable with a current driver qualification file and a calendar.
Expired medical certificate, wrong CDL class, missing endorsement, no valid license.
HM Compliance
Parts 171–180 · Not publicly displayed
Hazardous-materials discipline for carriers hauling placardable quantities: the paperwork, the placards, and the package. If you don't haul hazmat, this BASIC simply stays empty.
Placarding errors, shipping-paper gaps, leaking or unsecured packages.
◆ Sources: FMCSA SMS Methodology; 49 CFR Part 385. Thresholds shown are the intervention lines for general (property) carriers — passenger and hazmat carriers use lower ones. Crash Indicator and HM Compliance percentiles are visible to the carrier and to enforcement, not to the public.
The Crash Indicator deserves one more sentence, because it surprises people: it counts involvement, not fault. A crash someone else caused still lands in your history — unless it fits an eligible type and is ruled Not Preventable through FMCSA's Crash Preventability Determination Program, which removes it from the score.
From violation to percentile.
Severity, recency, and peer group — then a line you don’t want to cross.
Three forces turn a line on an inspection report into the number an underwriter reads. The short version:
01 · Severity
1–10
+2 if out of service
Every violation code carries a weight tied to crash risk. A marker lamp is a 1; a brake out-of-service adds points a light never will.
02 · Time
×3 · ×2 · ×1
0–6 / 6–12 / 12–24 months
Recent counts more. A violation triples for six months, fades as it ages, and falls out of the math entirely at 24 months.
03 · Peers
0–100
percentile · higher is worse
Your weighted total is ranked against carriers with a similar number of inspections and crashes — then reported as a percentile.
The peer grouping is the part small fleets should sit with. Your percentile compares you to carriers with a similar number of safety events — which is fair, but it also means a three-truck fleet's one bad morning is a much larger share of its record than a three-hundred-truck fleet's. The full worked math — and the small-fleet penalty — lives here.
Cross the threshold in any BASIC and you enter FMCSA's intervention range. The ladder runs like this:
Warning letter
A BASIC crossed its threshold. FMCSA mails a letter telling you it noticed — the cheapest intervention on the list, and the only one that costs nothing to answer well.
Roadside attention
High percentiles feed the ISS score officers see at the scale. More pull-ins mean more chances for violations — the loop that makes a bad score self-reinforcing.
Investigation
Offsite or on-site, focused or comprehensive. Investigators work the BASIC that flagged — and whatever else they find while they’re in your records.
Rating & penalties
A Conditional or Unsatisfactory safety rating, civil penalties, and — for carriers ruled unfit — an out-of-service order for the whole operation.
Who actually sees it.
Hidden from the public is not the same as private.
Since a 2015 change in federal law, FMCSA does not display property-carrier percentiles to the general public — and Crash Indicator and HM Compliance results were never public. What stays fully public is the underlying record: every inspection, violation, and crash, visible to anyone who looks up your DOT number.
That distinction matters less than it sounds. You can see everything by logging in with your USDOT PIN. Enforcement sees everything — the percentiles drive who gets a warning letter and who gets pulled in at the scale. And the market — brokers vetting carriers, underwriters pricing renewal, plaintiff attorneys after a crash — reads the same public data through commercial tools, whether or not FMCSA shows them a percentile.
The practical takeaway: treat the score as something worth reading monthly, because the people who price and hire your fleet already do. That is exactly what the TC Safety Index is for — a peer-benchmarked read across the seven categories, in the portal, before anyone else surprises you with it.
The 2026 overhaul.
The scoreboard is being rebuilt — live in preview now, official when FMCSA says so.
FMCSA is in the middle of the biggest SMS redesign since the program launched: roughly two thousand violation codes consolidated into about a hundred groups, severity weights simplified to 1 or 2, the BASICs renamed compliance categories with a new “Vehicle Maintenance: Driver Observed” category split out, and a proportionate percentile that is notably fairer to small fleets.
As of this writing the redesigned methodology runs in preview — you can see your own scores under it at FMCSA's CSA Prioritization Preview — while the legacy system above remains the official one until FMCSA announces the switch. Check both. The side-by-side of what's changing is in the inspections track, and the TC Safety Index already models the redesigned seven-category view.
What owner-operators actually ask.
Is a CSA score the same as my safety rating?
No — and mixing them up causes real confusion. The safety rating (Satisfactory, Conditional, Unsatisfactory) is an official verdict issued after an investigation under Part 385. SMS percentiles are prioritization data — a running read on your record. You can have alarming percentiles and no rating at all, or a Conditional rating with quiet percentiles.
What counts as a good CSA score?
Lower is better, and under the intervention threshold with room to spare is the practical target. Many small fleets see no percentile at all in some BASICs — with only a handful of inspections on record there isn't enough data to rank you, and that is not a problem to fix.
How do I check my score?
Log in at csa.fmcsa.dot.gov with your USDOT number and PIN — the logged-in view shows every percentile, including the ones the public can't see. Scores recalculate monthly, so the right cadence is once a month and after every inspection.
Do violations ever come off my record?
Two ways. Every violation ages out at 24 months, and its weight fades as it ages — a clean streak is genuine score repair. And data that is wrong — wrong carrier, wrong driver, a citation dismissed in court — can be challenged through DataQs, which can remove the line itself.
Does a clean inspection actually help?
Yes — it is a data point in your favor. Clean inspections grow the denominator under your percentile and pull it down. For a small fleet with few inspections on record, a run of clean ones is one of the fastest legitimate ways to move the number.
The score is not a verdict — it's a running tally, and you're allowed to read it. The carriers who manage CSA well are simply the ones who look at the scoreboard before the people pricing their insurance do.
Know your number before they do.
Our compliance specialists review your CSA profile the way an auditor would — find the BASIC most likely to draw attention, dispute the data that’s wrong, and fix the program gap feeding it. And the TC Safety Index keeps the seven-category read in front of you every month.
Disclaimer
For informational purposes only — not legal, tax, or regulatory advice. Always verify requirements with FMCSA, your state agency, and qualified compliance professionals. Regulations and fees change; verify current requirements on official .gov sources before filing.