CSA Score
Compliance, Safety, Accountability score, FMCSA's system for measuring and ranking carrier safety performance.
CSA Score in Practice
Scores Are Relative, Not Absolute
A CSA percentile compares a carrier against others with similar exposure, meaning the same violation history can rank differently depending on how many inspections a carrier has had overall. A higher percentile is worse, reflecting more relative risk.
Every Roadside Inspection Counts
Even a clean inspection with no violations affects a carrier's CSA data by adding to the total inspection count used in scoring. Consistent, minor violations across many inspections can hurt a score as much as one serious incident.
Brokers and Insurers Check It
CSA scores influence more than FMCSA oversight. Brokers vetting carriers and insurance companies setting premiums both commonly factor CSA data into their decisions, making a clean score valuable well beyond regulatory compliance.
CSA Score: What It Means and Why It Matters
A CSA score is FMCSA's ongoing measure of carrier and driver safety performance, built from roadside inspection results and reported crashes rather than a single audit. Scores are calculated across seven categories, called BASICs, covering areas like unsafe driving, hours of service compliance, and vehicle maintenance, with each carrier ranked by percentile against similar carriers. Because scores update continuously and roll off after a set lookback window, a single bad inspection can temporarily hurt a score without permanently defining a carrier, but a consistent pattern of violations across multiple BASICs tends to draw real scrutiny from brokers, shippers, and the FMCSA alike.
How CSA Scoring Works
The CSA program scores carriers across seven BASICs (Behavior Analysis and Safety Improvement Categories): Unsafe Driving, Hours of Service Compliance, Driver Fitness, Controlled Substances and Alcohol, Vehicle Maintenance, Hazardous Materials Compliance, and Crash Indicator. Violations found during roadside inspections are weighted by severity and how recently they occurred, then converted into a percentile ranking against other carriers with similar inspection volume.
Data used in the scoring generally covers a rolling 24-month lookback window, meaning older violations gradually age out of the calculation while new inspection results continue feeding in. This makes a CSA score a snapshot of recent behavior rather than a permanent mark, though a carrier with consistently poor inspections will keep a high, unfavorable percentile as long as the pattern continues.
A Practical Example
A carrier receives three roadside inspections over several months, each finding a minor vehicle maintenance violation, such as a worn brake component or a burned-out marker light. Individually, none of these would raise much concern, but together they push the carrier's Vehicle Maintenance BASIC percentile above the threshold the FMCSA uses to flag carriers for intervention, potentially triggering a warning letter or a more detailed review even without a single major violation involved.
Why CSA Scores Matter for Owner-Operators
For an owner-operator, CSA data doesn't just sit in a regulatory database. Many brokers pull CSA scores before booking with an unfamiliar carrier, and insurance companies frequently use them when setting premiums, meaning a poor score can translate directly into fewer loads offered and higher insurance costs, even without any single incident serious enough to trigger an audit or out-of-service order.
Common Misconceptions
A common misconception is that only serious violations affect a CSA score. In practice, a pattern of minor violations across multiple inspections can push a BASIC percentile up just as much as one major issue, since the score reflects a broader pattern rather than any single event.
Another misconception is that a CSA score is the same thing as a safety rating. They're calculated differently and updated on different schedules: CSA data updates continuously from roadside inspections, while a safety rating only changes after a formal compliance review.
Related Calculators
Related Regulatory & Compliance Terms
Carriers on CSA Score
“A string of small maintenance violations pushed my percentile up before I even realized it was happening. Now I treat every roadside inspection like it actually matters, because it does.”
“A broker told me straight up they check CSA scores before booking unfamiliar carriers. Keeping mine clean has opened up freight I wouldn't have gotten otherwise.”