I do not have any type of autopilot or self driving mode turned on; I didn't pay for it, and I have HW2 so the feature set is very limited. However, this didn't prevent my car from doing a very unexpected and dangerous thing, a few days ago, and I've only now come up with the time, words, and patience to describe it: I was making a left turn from southbound Highway 17 (up the hill on Santa Clara County side) to go around a traffic condition, onto one of those mountain roads. Oncoming traffic was about 3 cars. Two buched up in the #2 lane, and another further behind also in #2 lane. I waited until all were going to stay in same lane. I decided to take the #1 lane position, brake, and get ready to go either in between the first 2 cars and the 3rd one, or after the 3rd one, depending on conditions. This would get my car, then currently parallel with 17, turned toward the side road (almost perpendicular, of course), so that acceleration would be easier. Plus, if I timed it right, the rolling start would give more speed. As I did this maneuver, my car made all sorts of alerting beeps, and cut the accelerator out. There I was, in angle-from-head-on 70mph traffic at an angle which would kill me since it's not head-on, and the car decides to take over and try to kill me. WHAT THE HELL! I submitted a bug report a few minutes later with no explanation. But, to me THIS IS NOT A SAFETY FEATURE: KILLING ME IS NOT A SAFETY FEATURE. I was VERY lucky that there was a HUGE gap of traffic after car #3, otherwise I would have died. While having that huge gap was part of my decision, as you saw in my above description, it could have been less huge. I was able to react by turning RIGHT into the #1 lane head on to figure out what the hell to do while my car was in NO GO mode, and I was able to take control again and floor it, making a 120º turn into the road I wanted, but hell, what if the car decided to stop again?! Tesla, stop trying to drive for me when I know what I am doing. I have made this turn half a hundred times in my old Mercedes with much less problem. I always thought "the 4 wheel drive of the Tesla must be amazing on this turn", but as it turns out, that's the opposite of the truth! Is there a certified way to turn off this feature during such a high-stakes turn? And before you tell me to stop taking Highway 17, you can buy me a $1,200,000 house in Silicon Valley no debt or go stuff it. And yes, I know, I could move to Idaho and freeze to death. We all have our situations. More information: no road there is straight or at right angles, and nothing is level. 200' trees and 200' valleys and mountains surround everything. Traffic is heavy in most directions. Life lives. Staying still does not.