# Tesla driver-assist system fatal crash investigation > Live situation record from CLSTR: https://clstr.news/situations/tesla-driver-assist-system-fatal-crash-investigation > Updated: 2026-09-03T21:46:53.000Z. Sources: 7. Developments: 2. Federal filings submitted to the National Highway Traffic Safety Administration (NHTSA) have confirmed that a Tesla driver-assist system was active during a fatal accident in Mesa, Arizona. The crash occurred on October 31, 2025, when a 2020 Model 3 came to a complete stop on the Loop 202 freeway and was rear-ended by a Ford F-350, resulting in the driver's death. Data indicates the vehicle's engagement status was ‘Verified Engaged’ at the time of impact. The incident mirrors a previous fatal accident in Florida involving a Model 3 that also stopped in an interstate lane while driver-assist software was active. While the exact cause of the sudden stoppage remains under investigation, reports note that Tesla has redacted certain details, such as software versions, citing ‘confidential business information.’ The phenomenon of vehicles unexpectedly applying brakes, known as ‘phantom braking,’ is a recognized issue associated with these systems. ## Timeline ### 2026-09-03: Tesla automated driving system active in fatal Arizona highway crash Federal filings show a Tesla's automated driving system was engaged when the vehicle stopped on an Arizona highway, leading to a fatal rear-end collision with a pickup truck. 4 sources. https://clstr.news/cluster/tesla-automated-driving-system-active-in-fatal-arizona-highway-crash ### 2026-08-31: Tesla driver-assist system active in fatal Arizona freeway crash Tesla reports that a 2020 Model 3 had its driver-assist system engaged when it stopped on an Arizona freeway and was fatally struck by a pickup truck, mirroring a similar recent incident in Florida. 2 sources. https://clstr.news/cluster/tesla-driver-assist-system-active-in-fatal-arizona-freeway-crash --- Cite as: Tesla driver-assist system fatal crash investigation. CLSTR, https://clstr.news/situations/tesla-driver-assist-system-fatal-crash-investigation