What changed

FMCSA implemented several Safety Measurement System (SMS) methodology updates in Q1 2026 reflecting the long-running CSA reform process. Headline changes: the Crash Indicator preventability program is now live (allowing carriers to challenge specific non-preventable crashes through DataQ), severity weights for HOS Compliance and Vehicle Maintenance violations were rebalanced, and the small-carrier minimum-inspection threshold for percentile ranking was clarified.

The preventability program is the highest-impact change. Carriers can now formally argue specific crashes were non-preventable (e.g., struck-from-behind while stopped at a traffic signal); accepted preventability claims remove the crash from the Crash Indicator BASIC calculation.

Severity weight rebalancing

FMCSA reduced the severity weight for several Vehicle Maintenance violations (cracked windshields, minor lighting issues) and increased the weight for HOS Compliance violations involving falsified logs or ELD malfunctions ignored by the carrier. The net effect: carriers with a clean ELD program but cosmetic equipment defects benefit; carriers with sloppy HOS records see worse percentiles.

How to use preventability

File a preventability challenge through the regular DataQ portal under the new "Crash Preventability" challenge type. Provide the police report, dashcam video, and a written narrative explaining why the crash was non-preventable.

The FMCSA preventability committee adjudicates within 90 days. Acceptance removes the crash from Crash Indicator calculations going forward; the historical SMS percentile is recomputed.

What to do next

Audit your past 24 months of crashes for preventability candidates. Focus on rear-end-while-stopped, struck-by-uninsured-driver, and force-of-nature events. File preventability challenges for any crash with a clear non-preventable narrative. Our /guides/csa-scores-and-oos-rate page covers the SMS framework in detail.