I did a trip to Salem, OR and back today and there were actually two incidents while on AP, though if they had resulted in an accident, I don't think either would have been my fault. The first was going down I-205 with moderately heavy traffic that was moving along about 45. Suddenly the line of cars in front of my stopped with some screeching of tires and AP saw it as critical enough to engage the physical breaks (instead of regen). I thought AP was breaking a little harder than I would have in that situation, we were down to about 10 mph before we closed to within 3 car lengths with the car in front. Then I heard major screeching behind me and when I looked in the rear view mirror there was a fairly new Mustang with a cloud of smoke from burning rubber coming up. He just barely missed me. I disengaged AP immediately and pulled forward closer to the stopped cars in front to give a bit more room. It may have made the difference. He finally stopped very close to my car. He probably wasn't paying enough attention, but I did think AP was braking a bit hard for the situation. I did think it kind of odd when I've seen a lot of people complain that AP doesn't react fast enough or stop hard enough. Maybe an undocumented tweak from the last firmware update? Or just an edge situation. On the way back there was a more minor incident when I moved from the inside lane to the middle lane (3 lanes in each direction) on AP, and just as I pulled into the lane someone zoomed from the outside lane into the middle lane and had to pull up short to keep from rear ending me. She continued on into the inside lane and kept going. I didn't see her until we were in the same lane, she was completely in my blind spot the whole way, even checking the mirrors (I don't trust AP unsupervised). It probably would have happened in most cars with any kind of rear quarter panel. The only way to have seen her was with all around glass and looking over shoulders (which I do, even on AP). AP 2 needs a rear camera to visually see all the cars to the rear and spot this kind of thing. The ultrasonic sensors don't have the range to spot someone two lanes over from moving into the lane you're trying to move into. Fortunately nothing bad happened to anyone except the Mustang driver burned off a couple of hundred miles worth of tire tread and maybe he needed a change of underwear. On the upside, we were going down there to look at kittens. I think we may have found our new family members, but it will be a few weeks until we find out.