On XXX at approximately 5:00 PM, I was driving my 2020 Tesla Model 3 on [XXX] from [XXX] toward [XXX], with Tesla FSD engaged. Near the area where the center divider begins/ends, the vehicle crossed the double yellow/divider area and entered the opposing traffic lane. There was no oncoming traffic at that moment, so there was no crash, but this created a serious potential head-on collision risk. The car also did several hard jerks that aggravated my neck and back that it has been consistently doing for a long time which cause worse ongoing headaches. The system/component that malfunctioned was Tesla FSD/Advanced Driver Assistance, including lane keeping/steering behavior. The vehicle is available for inspection upon request. My safety and the safety of others were put at risk because the vehicle moved into the lane for oncoming traffic. I had to intervene and no longer feel safe using FSD. I have reported unsafe FSD behavior to Tesla multiple times before, but the issue has not been resolved. Tesla service has previously listed the concern as “FSD not working properly/test drive required” and/or general diagnosis, but I have not received a clear written resolution explaining why the vehicle crossed into the opposing lane or how Tesla will prevent this from happening again. There were no warning lamps or messages that I recall before the vehicle crossed into the opposing lane. If Tesla has vehicle logs or telemetry for the incident, I request that they be reviewed. I am re