CSA Score Improvement Plan | How to Reduce BASIC Scores & Improve Fleet Safety

The mechanism that lowers a CSA score is a combination of not accumulating new violations and letting time weight erode existing ones. The 24-month rolling window means a violation older than 24 months is no longer used in the score, and a violation between 12 and 24 months old counts a third as much as one from the past six months. So a fleet that runs 90 days clean actually sees older violations quietly losing weight in the calculation, which shows up as an improving percentile. Beyond that passive improvement, three active levers move scores faster: submitting DataQs challenges on legitimately erroneous violations to get them removed; earning clean roadside inspections, which are positive data points that improve the percentile directly; and closing off the causes of new violations — which typically means better pre-trip inspections, digital DVIRs that satisfy the 2026 Driver Observed category, same-day defect-to-work-order routing, and disciplined preventive maintenance. Insurance underwriters use CSA scores in pricing, so score improvement often translates to premium impact at the next renewal.

FMCSA evaluates every motor carrier across seven Behavior Analysis and Safety Improvement Categories, each scored independently as a percentile from 0 to 100. The three high-crash-risk categories have the strictest thresholds at 65 percent: Unsafe Driving (which under the 2026 SMS overhaul now includes all out-of-service and drug and alcohol violations), Hours of Service Compliance (HOS violations and ELD issues), and Crash Indicator (24-month crash history with severity weighting). The four remaining categories share the 80 percent threshold: Vehicle Maintenance (brakes, tires, lights, steering, and other maintenance violations found at roadside); Vehicle Maintenance: Driver Observed (a new 2026 category that scores defects a driver walk-around should have caught, making DVIR quality directly visible in the score); Driver Fitness (qualification file gaps, expired medical cards, invalid licenses); and Controlled Substances/Alcohol (drug and alcohol testing violations and Clearinghouse gaps). The Hazardous Materials Compliance category applies only to fleets carrying hazmat and has its own threshold, which the 2026 update raised from 80 to 90 percent.

In the Safety Measurement System, violations remain in the score calculation for 24 months from the date of the inspection, with time-weighted severity so that recent violations count much more heavily than older ones. Violations in the past six months carry approximately three times the weight of violations 12 to 24 months old, and a violation more than 24 months old falls out of the calculation entirely. Under the 2026 SMS update, for several BASICs including Hours of Service, Vehicle Maintenance, Vehicle Maintenance Driver Observed, Hazardous Materials, and Driver Fitness, only violations from the past 12 months are used to determine whether a carrier is prioritized for intervention, though the SMS still calculates measures using the full 24-month history. Separately, violations remain in the FMCSA Motor Carrier Management Information System (MCMIS) and the Pre-employment Screening Program (PSP) databases for longer periods — three years for driver PSP inspection records and five years for crashes — even after they no longer affect the CSA percentile.

Yes, and this is one of the most under-appreciated levers in CSA improvement. The Safety Measurement System calculates each BASIC as a normalized measure that accounts for inspection volume — the more clean inspections a fleet has, the more the math dilutes any individual violation. In practical terms, a clean Level 1 roadside inspection is a positive data point that measurably improves the percentile, not just an absence of a bad one. So a fleet that prepares its trucks so they routinely pass Level 1 inspections without violations builds a rising floor of clean data that offsets older violations still in the calculation. This is why disciplined pre-trip inspection programs improve scores in two directions at once: they prevent the bad marks that would push the percentile up, and they generate the good marks that pull the percentile down. Under the 2026 Vehicle Maintenance: Driver Observed category, the quality of driver-conducted inspections is now directly measured in the score, which makes photo-verified digital DVIRs an even more direct lever than they were before.

DataQs is FMCSA's online system for challenging the accuracy of information used in its data programs, including violations that appear on a carrier's CSA record. Legitimate grounds for a DataQs challenge include a violation attributed to the wrong VIN or DOT number, a violation cited under the wrong regulation, a severity weight that was mis-scored, a violation for a defect that was already repaired and documented before the inspection, and a crash that was later determined to be not preventable through the FMCSA Crash Preventability Determination Program. If a challenge is successful, the violation is corrected or removed from the SMS calculation, which can produce a measurable percentile improvement almost immediately. DataQs is not a way to challenge violations that were properly issued, and frivolous challenges waste time on both sides. The most productive first move in any 90-day CSA improvement plan is to pull the last 24 months of violations, identify anything with a defensible data-quality issue, and file the challenges promptly — the older the challenge, the less impact it has, because the violation is already losing weight naturally.