I have seen a few posts about ghost vehicles appearing while using AP in a Model X, but I wanted to recount my experience yesterday in my Model S. I was driving about 70 in Autosteer using AP1 in the HOV lane on I-85 in Atlanta. No cars near me at all. Suddenly I got the loud beeping noise that I normally get when there is a stopped vehicle in front of me, the "red stopped vehicle" icon appeared on my screen, the car slammed on the brakes and decelerated about down to 45. Luckily I was paying attention and had my hands on the steering wheel, so I was able to accelerate, get out of autosteer and had no real issue other than scaring my wife. I have never had that happen before and am curious if anyone else has. Maybe it is a new software bug as I updated to Version 17.26.17 last week. Point is, it happened, so be aware (I know none of us are ever distracted or take out hands off the wheel while in AP).