Yeah, I know, you MUST pay attention to what's in front of at all times when using AP, but I just wanted to point out that AP currently does not handle a relatively common traffic pattern in stop and go traffic. Twice now, when a freeway lane beside me has been blocked off (both times for accidents in those lanes), a car beside me merges quickly and closely into my lane - this is the typical cars alternating and merging at slow speed when a lane ends. AP does NOT see a quickly merging car coming into your lane. AP continues to try to keep distance from the original car ahead in your lane, oblivious to the merging car until it is too late. The first time this happened to me, I was not paying attention, and my car's collision warning sounded, and I just barely had time to stomp on the brakes, missing the new car's bumper by inches. The second time, I was ready and expecting this behavior, so I had time to watch what was happening. When cars are merging from a lane that is closing, they expect the car behind them to give them room to merge, so they leave very little room for the merge. According to the AP display, AP does not see the newly merging car until it is at least halfway into your lane. Since the AP does not see the merging car, it continues to drive towards the car that used to be in front of it, which can result in an accident if the driver does not take control away from AP (by stepping on the brake). After seeing this behavior again today, I paid attention to cars coming up from behind me at a slow relative speed in lanes beside me. The AP display would not show these cars until they were at least two car lengths ahead of my car. Needless to say, this lack of immediately sensing new cars beside you coming up from your rear, is what causes this dangerous situation when travelling slowly, since there are situations were cars will essentially and legitimately cut you off. I was using distance control of 4, Model X. I still love my AP and love to use it. However, I will now be expecting to take over when cars are merging into my lane in stop and go traffic (as well as other cases I've discovered of course). Mods - can we have an Autopilot forum topic all by itself? These AP discussion are generic to both the Model X and S (and soon Model 3), so there should be some logical place to put such discussions rather than in the model specific forums.