CSA Scores Explained: What Every Carrier Must Know
Your CSA score determines whether FMCSA investigates your operation, whether brokers book your trucks, and how much you pay for insurance. Understanding how CSA works is not optional — it directly affects your bottom line and your authority.
Quick answer
A CSA score is a safety performance measurement assigned to motor carriers by FMCSA under the Compliance, Safety, Accountability program. It is not a single number — carriers are scored across 7 Behavior Analysis and Safety Improvement Categories (BASICs), each rated from 0 to 100 as a percentile ranking against peer carriers. Higher percentiles indicate worse safety performance. Exceeding the intervention threshold (65th percentile for most categories) triggers FMCSA enforcement actions.
What is a CSA score?
CSA stands for Compliance, Safety, Accountability— FMCSA's program for identifying high-risk motor carriers, drivers, and vehicles. The program collects data from roadside inspections, crash reports, and compliance investigations, then scores carriers across 7 categories called BASICs.
Each BASIC category generates a percentile score from 0 to 100, comparing your safety record to peer carriers of similar size and operation type. A carrier at the 80th percentile is performing worse than 80% of its peers in that category.
Key facts about CSA scoring:
- CSA is not a single number — it is 7 separate percentile scores
- Lower percentile = better safety performance (opposite of what most expect)
- Data comes from roadside inspections, crash reports, and investigations
- Scores are updated monthly by FMCSA
- Only carriers with sufficient inspection data receive a score in each category
- Peer groups are based on carrier size (number of power units and VMT)
The 7 BASIC categories
Each category targets a specific area of safety performance. Violations carry severity weights from 1 to 10, and recent violations (within 12 months) count more heavily than older ones.
Unsafe Driving
What triggers violations
Speeding, reckless driving, improper lane change, failure to use seatbelt, texting/phone use while driving
Severity weights
Severity weights range 1-10. Speeding 15+ mph over = 10 points. Seatbelt violations = 7 points.
Hours of Service Compliance
What triggers violations
HOS violations (11-hour driving, 14-hour window, 30-minute break, 60/70-hour rule), ELD tampering, false log entries
Severity weights
False log book = 10 points. Driving beyond 11-hour limit = 7 points. No ELD when required = 5 points.
Driver Fitness
What triggers violations
Invalid/expired CDL, missing medical certificate, no valid license for vehicle class, lack of required endorsements
Severity weights
Operating without a CDL = 10 points. Expired medical certificate = 4 points.
Controlled Substances / Alcohol
What triggers violations
Positive drug/alcohol tests, possession of controlled substances, use of alcohol within 4 hours of duty, refusal to test
Severity weights
Positive drug test or possession = 10 points. Use of alcohol on duty = 10 points.
Vehicle Maintenance
What triggers violations
Brake defects, tire issues, lighting violations, missing/defective DVIR, cargo securement failures
Severity weights
Brake out of adjustment = 4 points. Inoperative brakes = 8 points. Flat tire/fabric exposed = 8 points.
Hazardous Materials Compliance
What triggers violations
Improper placarding, shipping paper errors, leaking containers, HM routing violations (HM carriers only)
Severity weights
No placards when required = 8 points. Shipping papers missing = 4 points.
Crash Indicator
What triggers violations
DOT-reportable crashes involving fatality, injury, or vehicle tow-away — weighted by severity regardless of fault
Severity weights
Fatal crash = 10 points. Injury crash = 8 points. Tow-away crash = 4 points. Time-weighted over 24 months.
How CSA scores are calculated
FMCSA uses a multi-step process to convert raw inspection and crash data into your percentile scores. Understanding this process helps you focus improvement efforts where they matter most.
1. Data collection — roadside inspections
Every roadside inspection conducted by law enforcement generates a report that is uploaded to FMCSA's Motor Carrier Management Information System (MCMIS). Violations identified during inspections are categorized into the relevant BASIC and assigned a severity weight from 1 to 10.
2. Severity weighting
Not all violations are equal. A brake out of adjustment (4 points) is weighted less than completely inoperative brakes (8 points). Speeding 15+ mph over the limit scores 10 points while a minor documentation issue might score 1 point. These weights reflect the violation's relationship to crash risk.
3. Time weighting
Recent violations count more. FMCSA applies a time weight multiplier of 3x for violations in the most recent 12 months and 2x for violations 12-24 months old. After 24 months, the violation drops off your record entirely. This means your score improves naturally as violations age — if you stop accumulating new ones.
4. Peer group comparison (percentile ranking)
Your total weighted score in each BASIC is compared to other carriers in your peer group — determined by the number of inspections, power units, and vehicle miles traveled. FMCSA ranks you as a percentile from 0 to 100. If you are at the 70th percentile in Unsafe Driving, you are performing worse than 70% of similar carriers.
5. Safety event groups
FMCSA groups related violations into safety event groups (SEGs) so that multiple violations from a single inspection are not double-counted unfairly. Only the most severe violation within each SEG is used for scoring. This prevents a single bad inspection from disproportionately inflating your score.
CSA score thresholds and interventions
FMCSA uses percentile thresholds to determine when to intervene with a motor carrier. The threshold varies by carrier type — HazMat and passenger carriers face stricter standards.
| Percentile | Risk level | What happens |
|---|---|---|
| Below 50th | Low | No FMCSA action — you are performing better than half of your peer group |
| 50th–64th | Moderate | No formal action for general carriers, but HazMat and passenger carriers may receive warning letters at the 50th percentile |
| 65th–74th | Elevated | Warning letter from FMCSA. Your carrier is flagged for potential investigation. Brokers and shippers may see elevated scores. |
| 75th–84th | High | Targeted investigation likely. FMCSA may conduct an on-site compliance review or request a corrective action plan. |
| 85th+ | Severe | Consent order or out-of-service order possible. FMCSA can shut down your operation until deficiencies are corrected. |
Carrier type thresholds:
- General freight carriers: 65th percentile triggers FMCSA intervention
- HazMat carriers: 50th percentile (stricter due to public risk)
- Passenger carriers: 50th percentile (stricter due to passenger safety)
Types of FMCSA interventions:
- Warning letter — notification that you have exceeded the threshold in one or more BASICs
- Investigation — on-site compliance review of your operation, driver files, and maintenance records
- Targeted plan — carrier-developed corrective action plan with FMCSA oversight
- Consent order — formal agreement requiring specific improvements within a set timeline
- Out-of-service order — your authority is suspended until deficiencies are corrected
How to check your CSA score
Go to the FMCSA SMS portal
Visit ai.fmcsa.dot.gov — this is the Safety Measurement System website where FMCSA publishes carrier safety data. The public view shows limited information; the full carrier view requires your DOT number and PIN.
Log in with your DOT number and PIN
Enter your USDOT number and your carrier PIN. If you do not have a PIN, you can request one through the FMCSA portal. The PIN provides access to your full safety profile including all inspection details and violation history.
Review your 7 BASIC category scores
Your carrier overview page displays percentile scores for each BASIC where you have sufficient data. Categories without enough inspections show as "insufficient data" rather than a score. Click into each category to see the individual violations driving your score.
Use a carrier lookup tool for a quick overview
Free tools like our carrier lookup pull publicly available SMS data and display your safety profile at a glance — including authority status, insurance status, and inspection history.
How to improve your CSA score
CSA improvement is not about gaming the system — it is about fixing real safety issues and ensuring clean data. Here are proven strategies organized by BASIC category.
Hours of Service
- Install a quality FMCSA-certified ELD that auto-logs duty status changes and prevents driving beyond limits
- Train drivers on the 11-hour driving, 14-hour window, and 30-minute break rules
- Audit ELD data weekly — catch violations before FMCSA does
Vehicle Maintenance
- Conduct thorough pre-trip and post-trip inspections daily using a digital DVIR
- Document every repair with receipts and photos — useful for DataQs challenges
- Schedule preventive maintenance on brakes, tires, and lights before they become violations
Unsafe Driving
- Implement speed governor policies and monitor driver speed reports
- Use dashcam coaching to address tailgating, hard braking, and distracted driving
- Enforce a zero-tolerance seatbelt policy — it is one of the easiest violations to prevent
Driver Fitness
- Maintain a driver qualification (DQ) file for every driver with current CDL, medical certificate, MVR, and employment history
- Set calendar reminders 90 days before CDL and medical card expiration dates
- Verify endorsements match cargo type before dispatching
Across All Categories
- Challenge incorrect violations through DataQs — many carriers never dispute, leaving bad data on their record
- Accumulate clean roadside inspections — clean reports dilute the impact of past violations
- Request Level 3 (driver-only) inspections at weigh stations when your truck is in good shape to build positive history
Impact on your business
CSA scores affect far more than just FMCSA enforcement. They ripple through every part of your trucking operation.
Insurance rates
Underwriters pull CSA data during quoting and renewal. Carriers with scores above the 65th percentile in Unsafe Driving or Crash Indicator can see premium increases of 15-30%. Some insurers decline to quote carriers with multiple elevated BASICs.
Broker and shipper selection
Major brokers and freight platforms check CSA scores before tendering loads. Many set internal thresholds at the 50th or 60th percentile. Elevated scores mean fewer load offers and reduced rate negotiation power — especially for new authority carriers building reputation.
Operating authority
FMCSA can revoke or suspend your operating authority based on CSA performance. An out-of-service order means no revenue until deficiencies are corrected and FMCSA reinstates your authority. This process can take weeks or months.
Customer contracts
Direct shippers and enterprise customers often include CSA thresholds in their carrier agreements. Exceeding these thresholds can trigger contract termination clauses. Dedicated carriers risk losing their primary revenue source if CSA scores deteriorate.
CSA score FAQ
What is a good CSA score for a trucking company?
Lower CSA percentile scores are better. A score below the 50th percentile in all 7 BASIC categories is considered good. Carriers above the 65th percentile (50th for HazMat and passenger carriers) face FMCSA intervention. Many brokers and shippers set their own thresholds at the 50th or even 40th percentile when selecting carriers.
How do I check my CSA score?
Log in to the FMCSA Safety Measurement System (SMS) portal at ai.fmcsa.dot.gov with your DOT number and PIN. Your scores for all 7 BASIC categories are displayed on the carrier overview page. You can also use free carrier lookup tools that pull public SMS data to see your percentile rankings at a glance.
How long do CSA violations stay on your record?
CSA violations remain on your record for 24 months from the date of the inspection. However, FMCSA applies time weighting so that violations from the most recent 12 months carry more weight than older violations. After 24 months, the violation drops off your SMS profile entirely.
Can I dispute a CSA violation?
Yes. You can challenge incorrect violations through the FMCSA DataQs system at dataqs.fmcsa.dot.gov. Submit a Request for Data Review (RDR) with supporting documentation such as repair receipts, calibration records, or photos. FMCSA reviews each challenge and can remove or modify the violation if the evidence supports your case.
Do CSA scores affect insurance rates?
Yes. Insurance underwriters review CSA scores during policy rating and renewal. High scores in Unsafe Driving, Crash Indicator, or Vehicle Maintenance categories can result in higher premiums, additional surcharges, or difficulty finding coverage. Some insurers will decline to quote carriers with scores above the 75th percentile in multiple categories.
What is a DataQs challenge?
A DataQs challenge is a formal request to FMCSA to review and potentially correct inaccurate safety data, including roadside inspection violations and crash reports. You file it through the DataQs portal at dataqs.fmcsa.dot.gov. Common reasons include incorrect vehicle identification, violations attributed to the wrong carrier, or defects that were repaired before the inspection.
How often are CSA scores updated?
FMCSA updates CSA scores monthly through the Safety Measurement System. New inspection and violation data is typically reflected in your SMS profile within 30 to 45 days of the roadside event. Monthly snapshots are taken and published on a set schedule posted on the FMCSA website.
What happens when you exceed the CSA threshold?
When your CSA percentile exceeds the intervention threshold (65th percentile for general carriers, 50th for HazMat and passenger carriers), FMCSA may issue a warning letter, schedule an investigation, require a corrective action plan, issue a consent order, or in severe cases issue an out-of-service order that shuts down your operation until deficiencies are corrected.
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Reviewed by Don Grazio · UC Bureau Compliance Lead
Don has 12+ years working with motor carriers on FMCSA compliance, including new entrant audits, MCS-150 filings, BMC-91 insurance setups, and ELD compliance. UC Bureau researches FMCSA regulations (49 CFR Parts 380–399) directly with carriers across the U.S. and Canada. Content is fact-checked against current federal regulations. UC Bureau is not affiliated with the U.S. Department of Transportation or FMCSA — we provide tools and guides to help carriers stay compliant. Learn more about UC Bureau →