The Compliance, Safety, Accountability program publishes percentile rankings for every motor carrier across seven Behavior Analysis and Safety Improvement Categories (BASICs). FMCSA uses Safety Measurement System data — roadside inspections, crashes, and out-of-service orders — collected over a rolling 24 months. Crossing the intervention threshold in a BASIC triggers warning letters, off-site investigations, and ultimately on-site compliance reviews. The driver out-of-service rate (OOS) and vehicle OOS are separate metrics that compare your fleet directly against the national averages of 5.5% (driver) and 20.7% (vehicle), per the most recent FMCSA Annual Inspection Statistics.
The seven BASIC categories
The seven BASICs each measure a specific safety dimension:
- Unsafe Driving — speeding, reckless, lane changes, seat belt use. Source: roadside violations under 49 CFR Parts 392 and 397.
- Crash Indicator — DOT-recordable crashes from state-reported crash records. Not directly published; used for intervention triage.
- Hours-of-Service Compliance — driver log violations under 49 CFR Part 395. ELD form-and-manner violations included.
- Vehicle Maintenance — brakes, lights, tires, frame violations under 49 CFR Part 396.
- Controlled Substances/Alcohol — drug and alcohol violations under 49 CFR Part 382. Includes refusals.
- Hazardous Materials Compliance — hazmat-only carriers; 49 CFR Subchapter C violations.
- Driver Fitness — medical card, CDL, driver qualification file violations under 49 CFR Part 391.
Each violation has a severity weight (1–10) and a time weight (1, 2, or 3 depending on how recent). FMCSA sums the weighted violations, normalizes by the carrier’s exposure (power-unit count and inspection volume), and ranks the carrier against peers in the same Safety Event Group. The result is a percentile from 0 to 100 — lower is better.
Intervention thresholds
FMCSA only publishes BASIC percentiles to the carrier and to law enforcement; the public CSA portal at ai.fmcsa.dot.gov shows percentile only when a BASIC crosses the intervention threshold. The thresholds:
- General carriers (non-hazmat, non-passenger): 65th percentile
- Passenger carriers: 60th percentile
- Hazmat carriers: 60th percentile
Crash Indicator and Hazardous Materials BASICs use slightly different thresholds (50th percentile for Crash Indicator). Crossing the threshold flags the carrier for FMCSA intervention — first a warning letter, then an off-site investigation, then an on-site compliance review or focused review depending on the severity.
Driver OOS and vehicle OOS rates
The out-of-service rate is a direct ratio: number of inspections that resulted in an OOS order divided by total inspections. It is computed independently for driver OOS (resulting from driver-related violations like HOS, license, or drug findings) and vehicle OOS (resulting from defects flagged under the North American Standard Inspection criteria).
The current national averages are roughly 5.5% for driver OOS and 20.7% for vehicle OOS. A carrier sitting at twice the national rate in either column is essentially guaranteed to draw an FMCSA focused inspection in the next 12 months. Brokers reviewing a carrier’s SAFER record will pass on any operation showing >15% driver OOS or >40% vehicle OOS.
Get your record before a broker does
Run our CSA score checker to see your published BASIC percentiles, OOS rates, and 24-month inspection history pulled directly from FMCSA. Brokers and shippers run the same lookup before tendering loads.
The rolling 24-month window
Every violation rolls off the carrier’s record 24 months after the inspection date. That gives operators a built-in remediation path: clean up driver behavior and vehicle maintenance, and the score improves automatically as old violations age off. Time-weight bands compress the math:
- Months 0–6: violation weight × 3
- Months 7–12: violation weight × 2
- Months 13–24: violation weight × 1
- Month 24+: dropped from the calculation
A serious recent violation drives the score harder than a moderate older one. Two clean quarters of inspections after a stretch of bad ones can pull a BASIC back below the threshold.
Challenging incorrect violations: DataQs
The FMCSA DataQs portal is the formal channel to challenge inspection records, crash reports, and any other data that contributes to your CSA score. File a Request for Data Review (RDR) within 24 months of the inspection. State agencies adjudicate the request; FMCSA processes a final decision.
Successful challenges typically involve mistaken identity (wrong USDOT recorded), misclassified violations, or non-preventable crashes that improperly count against the carrier. Carriers who actively run DataQs maintain meaningfully cleaner records than carriers who do not — the data simply has too many errors to leave unmonitored.
What an Unsatisfactory rating actually triggers
CSA scores are a precursor to a formal Safety Rating, which is set only after an FMCSA-conducted compliance review. The four ratings are Satisfactory, Conditional, Unsatisfactory, and Unrated. The consequences:
- Satisfactory: business as usual.
- Conditional: can continue operating, but most premium-rate brokers and lessors will pull contracts. Insurance premiums rise 25–50%.
- Unsatisfactory: within 60 days the carrier must either upgrade the rating or cease interstate operation under 49 CFR §385.13. Operating beyond that day is a federal violation.
- Unrated: default for carriers FMCSA has not audited. Most carriers are Unrated, which is fine.
Conditional and Unsatisfactory ratings are upgradeable through a formal Request for Change to Safety Rating filing — we handle the upgrade documentation at fastreinstatementfiling.com.
Practical CSA hygiene
Three habits separate carriers with sub-30 percentile scores from carriers with 65+ scores:
- Pre-trip and post-trip DVIR every dispatch under 49 CFR §396.11. Documented, not just performed.
- An ELD audit cadence: weekly review of edits, unassigned drive events, missed certifications.
- A driver scorecard tied to inspections: drivers see their own roadside violation count and OOS trail, and bonuses are tied to clean inspections.
Vehicle Maintenance is the BASIC that most fleets ignore until it spikes. Brakes, tires, and lights cause the majority of vehicle OOS. A $200 monthly preventive inspection per truck saves 5–10x in CSA-driven insurance premium.
The 2026 CSA reform: what is changing
FMCSA published a long-anticipated overhaul of the Safety Measurement System in 2024 that is rolling out through 2026. Three specific changes carriers should expect:
- Reorganized safety categories. The seven BASICs are reorganized into expanded categories with renamed groupings — Driver Behaviors, Vehicle Maintenance, Driver Fitness, etc. The underlying violation weights remain similar but reporting moves to category-level rollups.
- Item Response Theory (IRT) modeling. The new SMS uses IRT statistics to weight violations by how predictive each is of future crashes. Some violations that were heavily weighted historically (e.g., minor lighting) drop in severity; violations like brake adjustments and HOS rise.
- Better small-carrier handling. Carriers with fewer than 5 inspections in 24 months will see a different handling under the new model that reduces “noise” from low-volume data.
The reform is principally a methodological change rather than a regulatory one — the underlying violations are still the same and the consequences (warning letters, off-site investigations, on-site reviews) remain. Carriers should monitor announcements at fmcsa.dot.gov for rollout dates that may shift score visibility.
How CSA scores translate to insurance premiums
Insurance underwriters pull CSA percentiles and OOS rates as part of every renewal review. The translation:
- Sub-30 percentile across all BASICs: standard rates, possibly preferred-tier discount.
- 30–65 percentile: standard rates, maybe a small surcharge in the troubled BASIC.
- One BASIC over 65 percentile (intervention threshold): expect 10–25% premium hike or restrictive policy terms.
- Two or more BASICs over 65: 25–75% surcharge or non-renewal at the next anniversary.
- Conditional safety rating: typical 50–100% surcharge plus tightened coverage limits.
- Unsatisfactory rating: most insurers will not renew at any price.
The premium impact of bad CSA scores often exceeds the cost of the underlying compliance work needed to fix them. A $50/month preventive maintenance program per truck is dramatically cheaper than the premium surcharge from one Vehicle Maintenance BASIC spike.