NHTSA Complaint #11564203 — 2020 TESLA MODEL 3

Re: California Highway Patrol Accident Report [XXX] (see doc: [XXX] ). The driver of the Tesla noted that Tesla's FSD Beta version was engaged, and "When (the Tesla) was in the tunnel, (the Tesla) moved from the #2 lane into the #1 lane and started slowing down unaccountably. When (the Tesla) was about 20 miles per hour, he felt a rear impact." In January 2023, I reviewed available Google map data at the approximate GPS location of the accident. (see video: [XXX] ). Multiple conflicting data layers corresponding to that location may have contributed to the accident if the FSD Beta-controlled vehicle referenced the same or similar map data. The ADAS may have read a road closure on the island surface above the tunnel at [XXX] as relating to the lower level of the tunnel, and the lane change and subsequent slowing of the vehicle described by the driver may have been in response to this map data anomaly. In early 2023, I made multiple attempts to recreate the error while driving a Tesla Model 3 with the then-current FSD Beta version engaged. I drove in both directions of the tunnel and observed no abnormal reactions in any lanes of the eastbound tunnel. In one instance on a Sunday at approximately the same time of day and GPS location as the [XXX] accident, while driving in one of the tunnel's upper-level centermost lanes in the westbound direction, an ADAS alarm was triggered, and the system advised that the driver should take over immediately. It did not automatically slow the vehicle or change lanes. I noted that both occurred when GPS Navigation routing information may have been referencing weekend and holiday data versus weekday commute hours data. Previously, I had observed a difference between weekday and weekend navigation routes into San Francisco. A subsequent retest in the westbound direction on a later Sunday at a different time of day did not trigger an alarm. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)