CSA scores are one of the most important numbers your trucking operation has — and one of the most misunderstood. High CSA scores can trigger FMCSA intervention, affect shipper relationships, and raise insurance premiums. This guide explains exactly how CSA scores work, what the seven BASIC categories measure, and what steps actually move the needle on your score.
What Are CSA Scores and How Do They Work?
CSA stands for Compliance, Safety, Accountability — FMCSA’s safety measurement and intervention program for commercial motor carriers. Launched in 2010, CSA replaced the former SafeStat system and uses roadside inspection data, crash reports, and investigation findings to measure carrier safety performance across seven behavioral categories. FMCSA uses CSA scores to prioritize which carriers receive safety interventions, including warning letters, targeted roadside inspections, offsite investigations, and onsite audits.
CSA scores are maintained in FMCSA’s Safety Measurement System (SMS) and are updated monthly as new inspection and crash data is added. Carriers can view their own CSA data through the FMCSA SMS website. Some CSA data — specifically the carrier’s alert status in each BASIC — is also visible to the public on the FMCSA Safety and Fitness Electronic Records (SAFER) system, though the underlying percentile scores have been restricted from full public view due to a congressional mandate in the 2015 FAST Act.
Understanding your CSA scores is essential not just for avoiding FMCSA intervention but because shippers, brokers, and insurance carriers increasingly use CSA data to make business decisions. A carrier with elevated CSA scores in multiple BASICs may find themselves excluded from certain freight contracts or facing higher insurance premiums than competitors with cleaner records.
The Seven BASIC Categories That Drive CSA Scores
The seven BASICs (Behavior Analysis and Safety Improvement Categories) each measure a different dimension of carrier safety performance. Unsafe Driving covers roadside violations related to speeding, reckless driving, improper lane changes, and improper passing. Hours-of-Service (HOS) Compliance measures violations of federal hours of service rules, including falsified logs, exceeding daily or weekly driving limits, and missing or incorrect ELD records.
Driver Fitness captures violations related to operating a CMV without a valid CDL, operating with a medically disqualified CDL, or driving without the required medical certificate. Controlled Substances/Alcohol records violations involving drug and alcohol use, including positive roadside drug test indicators and alcohol violations. A strong drug and alcohol compliance program directly reduces your exposure in this BASIC.
Vehicle Maintenance tracks violations related to brakes, tires, lights, steering, and other equipment defects identified during roadside inspections. This is typically the highest-volume BASIC for most carriers. Hazardous Materials Compliance applies only to carriers transporting hazardous materials and covers packaging, labeling, and placarding violations. Crash Indicator reflects involvement in crashes reported to FMCSA, weighted by crash severity — fatalities and injuries are weighted higher than property-damage-only crashes.
How CSA Scores Are Calculated by FMCSA
CSA scores are not simply a count of violations. FMCSA uses a percentile-based scoring system that compares your carrier’s performance against other carriers of similar size (measured by roadside inspection count) in the same BASIC category. Your raw score is calculated from violation severity weights, time weights (more recent violations count more), and your inspection history. That raw score is then converted to a percentile ranking from 0 to 100.
Higher percentile rankings are worse — a score of 85 means your carrier performed worse in that BASIC than 85% of comparable carriers. Lower percentile scores are better. The percentile approach means your CSA score can change even without any new violations, because the comparison group is updated monthly as other carriers’ data changes.
Each violation recorded at a roadside inspection is assigned a severity weight from 1 to 10, with higher numbers indicating more serious violations. Hours of service violations, for example, range from 1 (minor logbook error) to 7 (operating beyond the maximum driving limit). Time weights ensure that violations from the past 6 months count more than violations from 18 to 24 months ago — older violations contribute less to your current score.
Alert Thresholds and What They Mean
Each BASIC has a different alert threshold — the percentile score at which FMCSA considers a carrier to be at elevated risk and potentially subject to intervention. Alert thresholds vary by BASIC and by carrier type (passenger carriers are held to stricter standards than property carriers). For property carriers, the typical alert thresholds are: Unsafe Driving (65%), HOS Compliance (65%), Driver Fitness (80%), Controlled Substances/Alcohol (80%), Vehicle Maintenance (80%), Hazardous Materials (80%), and Crash Indicator (65%).
Carriers at or above an alert threshold in a BASIC are designated as “alert” in that category. FMCSA may take various intervention actions against alert carriers, beginning with warning letters and escalating to targeted inspections and compliance investigations. A carrier with alerts in multiple BASICs has significantly elevated regulatory risk. Being in alert status also affects how your carrier is presented to shippers and brokers who review safety data before tendering loads.
What Events Affect Your CSA Score
CSA scores are built from two primary data sources: roadside inspections and crash reports. Every roadside inspection that results in a violation is uploaded to FMCSA’s DataQ system and eventually reflected in your SMS data. Inspections with no violations do not hurt your score — in fact, clean inspections help by demonstrating a track record of compliance in the percentile comparison.
Crashes are added to the Crash Indicator BASIC when they are reported to FMCSA through state crash reporting systems. FMCSA distinguishes between preventable and non-preventable crashes for some purposes, but all qualifying crashes — regardless of fault — are initially counted in the Crash Indicator BASIC. Carriers may request a preventability determination from FMCSA, which can affect how the crash is weighted.
Driver behavior is the single biggest driver of most BASICs. Unsafe driving, HOS violations, and controlled substance violations are all directly linked to driver conduct. This is why investing in driver training, ELD compliance, and a robust drug and alcohol testing program is not just a compliance exercise — it is a direct investment in your CSA scores and your business’s long-term viability.
How to Improve Your CSA Scores
Improving CSA scores requires consistent, sustained effort over time because the scoring window covers 24 months of data. Quick fixes don’t exist — but there are concrete actions that move the needle. The most impactful is reducing violation frequency at roadside inspections. This means conducting thorough pre-trip and post-trip inspections to catch and repair equipment defects before they’re flagged in an inspection, training drivers on hours-of-service recordkeeping and ELD usage, and maintaining drug and alcohol testing compliance to keep the Controlled Substances BASIC clean.
Accumulating clean inspections is also valuable. Every clean inspection adds to your inspection history and improves your relative standing in the percentile calculation. Participating in FMCSA’s SmartWay program or getting a Conditional or Satisfactory safety rating through an onsite audit can demonstrate compliance and may be taken into account in FMCSA’s intervention prioritization.
For the Crash Indicator BASIC, implementing a comprehensive crash management program — including driver coaching on defensive driving, in-cab monitoring systems, and a formal post-crash review process — reduces crash frequency and severity over time. Requesting preventability determinations for non-preventable crashes can also improve how those events are weighted in the BASIC.
Disputing Incorrect Violations via DataQs
If your CSA score contains violations that are factually incorrect — such as a violation incorrectly attributed to your carrier, an inspection with data entry errors, or a violation that was dismissed in court — you can dispute the record through FMCSA’s DataQs system at ai.fmcsa.dot.gov/DataQs. DataQs allows carriers, drivers, and other parties to request a review of specific inspection violations and crash records in the SMS database.
A successful DataQs challenge can result in corrections or deletions of incorrect violations, which directly improves your CSA scores in the affected BASICs. Carriers should assign a staff member or use a compliance service to regularly review their SMS data and identify any violations that may qualify for a DataQs challenge. Incorrect data that goes unchallenged continues to negatively affect your scores.
Frequently Asked Questions
How often are CSA scores updated?
FMCSA updates SMS data monthly. New roadside inspection data and crash reports are typically added within a few weeks of occurrence, though timing can vary by state. Your percentile score may change each month even without new violations, because the comparison group of peer carriers is also updated monthly.
Can shippers and brokers see my CSA scores?
Shippers and brokers can see your carrier’s alert status in each BASIC through FMCSA’s public-facing SAFER system. The underlying percentile scores are not publicly visible due to a congressional restriction in the FAST Act. However, carriers should be aware that the alert designation itself — visible publicly — can affect shipper and broker decisions.
How long do violations stay in my CSA score?
CSA scoring uses a 24-month lookback window. Violations from the most recent 6 months are weighted most heavily, violations from 7–12 months receive a slightly lower weight, and violations from 12–24 months receive the lowest time weight. After 24 months, a violation ages out of the scoring window and no longer contributes to your CSA score.
Does a drug and alcohol testing violation affect CSA scores?
Yes. Controlled substance and alcohol violations documented during roadside inspections are counted in the Controlled Substances/Alcohol BASIC. A well-maintained drug and alcohol testing program — with proper random testing, Clearinghouse compliance, and return-to-duty protocols — directly reduces your exposure in this BASIC category.
Can I dispute a crash that was not my driver’s fault?
Yes. Carriers can request a preventability determination from FMCSA for crashes involving their vehicles. If FMCSA determines a crash was not preventable, the crash is flagged in the system and its weight in the Crash Indicator BASIC is reduced. Detailed crash reports, dashcam footage, and police reports strengthen a preventability determination request.
Manage Your CSA Scores With Vertical Identity
Your CSA scores in the Controlled Substances/Alcohol BASIC are directly influenced by how well your drug and alcohol testing program is managed. A single violation in that BASIC — because a random test was missed, a pre-employment query wasn’t completed, or a Clearinghouse report was late — can push a compliant carrier into alert territory.
Vertical Identity’s C/TPA services keep your drug and alcohol testing program fully compliant with FMCSA requirements, protecting your CSA scores and your operating authority. Sign up today and learn more about our comprehensive DOT random testing program.