CSA Scores & OOS Rate

What are the seven BASIC categories?

The seven BASICs each measure a specific safety dimension:

1. Unsafe Driving — speeding, reckless, lane changes, seat belt use. Source: roadside violations under 49 CFR Parts 392 and 397.
2. Crash Indicator — DOT-recordable crashes from state-reported crash records. Not directly published; used for intervention triage.
3. Hours-of-Service Compliance — driver log violations under 49 CFR Part 395. ELD form-and-manner violations included.
4. Vehicle Maintenance — brakes, lights, tires, frame violations under 49 CFR Part 396.
5. Controlled Substances/Alcohol — drug and alcohol violations under 49 CFR Part 382. Includes refusals.
6. Hazardous Materials Compliance — hazmat-only carriers; 49 CFR Subchapter C violations.
7. 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.

What are the CSA intervention thresholds?

For property carriers, FMCSA does not show BASIC percentiles or alerts publicly - only the carrier (logged in) and enforcement see them; passenger-carrier percentiles and alerts remain public (FAST Act). The public CSA portal at ai.fmcsa.dot.gov shows property carriers’ inspection and crash data and measures for public BASICs, not percentiles or alerts. The thresholds:

Source: FMCSA SMS Methodology v3.21, Table 2-2. HM = hazardous-materials carriers; General = all other property carriers.

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.

How are driver and vehicle OOS rates calculated?

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. Running well above those averages can flag a carrier for targeted inspections.

How long do violations count toward a CSA score?

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.

How do I challenge an incorrect violation?

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.

Want it handled? We prepare and file it for you: see DataQs challenge filing.

What does an Unsatisfactory rating trigger?

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; brokers, shippers, lessors and insurers may review the carrier more closely.
• 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 — the upgrade documentation is prepared and submitted for you at fastreinstatementfiling.com.

How do I keep CSA scores low?

These habits keep inspection results, and therefore BASIC percentiles, in check:

• 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.
• Build the driver-qualification file from day one - one of the seven items reviewed in the new-entrant safety audit.
• Keep the DOT medical card current and the consortium random-pool enrollment paid up.

Brakes, tires, and lights are common vehicle OOS items, so a regular preventive inspection schedule targets the Vehicle Maintenance BASIC directly.

What is changing in the 2026 CSA reform?

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 do CSA scores affect insurance premiums?

Insurance underwriters review CSA percentiles, OOS rates, and the safety rating at renewal. BASICs above the intervention threshold, or a Conditional or Unsatisfactory rating, can lead to higher premiums, tighter policy terms, or non-renewal. The practical response is the same as for FMCSA: fix the underlying compliance issue and let old violations age off the 24-month window.