Hi everyone, I wanted to post this as an educational piece, as it were. We have owned a MX for almost 2 years now. We have AP1 and have been MORE THAN HAPPY with it. I personally have logged an excess of 15-20k miles in AP. Let's just say, I'm pretty experienced with AP, its' benefits, and its' limitations. I've read all the accidents that have happened and feel that I am pretty aware of how the system works. Before I move one, let me say the following. What happened to me a few days ago was NOT the MX's total fault. I have plenty of blame to take for this. I wanted to put this out as a PSA for those that may run into what I did. So I was on the highway. Stop and go traffic. Never climbing to more than 15-20mph for about 10 minutes. This almost feels like the best situation for autopilot. Tessa handles the lanes and the stopping/going without much issue. She's even gotten better over the years with abrupt acceleration/deceleration. So the car in front of me stopped abruptly....and Tessa recognized it and sounded the alarms. This isn't the first time that the alarm for front end collision came up. **quick aside** So with forward collision warning systems, it's quite the paradox. In some cars, you can play with its' senstivity. If you turn it too high up, you'll get a lot of beeping and alarming...even in situations where you intended on braking with more than enough time. That may have the unfortunate effect of causing a little bit of laziness. Truth be told, the MX is my wife's daily driver. I drive a C63 AMG-s. I have taken Merc's track day course in Road Atlanta. We had that alarm system go off multiple times while taking the Mercs around the track. I almost lazily felt like the system was a warning, but that it didn't necessarily mean that a collision was imminent. In the case of the tesla, i felt like the AP would understand the warning and brake HARD. So onwarrd..... I reacted slowly...by probably a tenth of a second. As soon as I realized the MX's braking wouldn't stop me in time, I performed an emergency brake. I couldn't go right or left so I just floored the brake. Well...I stopped about 1-2" too late and I hit the pickup in front of me. His car took zero damage but I have a damaged bumper/hood to show for my stupidity. To be fair, I was looking down at the time. Had I been FULLY paying attention to what was in front of me (driving without AP activated), I likely would've reacted quicker and not hit the car in front of me. I was over-reliant on AP and its' ability to brake correctly. Which leads me to my teaching points: 1. The Tesla will NOT ALWAYS stop in time...even under the best circumstances. This wasn't a situation where someone pulled out in front of me and there was a stationary object. This was literally just straight forward stop and go traffic. 2. In respects to #1, as Tesla always says, PAY ATTENTION to what is in front of you. The obvious limitation to radar sensed cruise control is that until the car in front of you begins to decelerate, your car won't decelerate. Your eyes may see something before the radar does. In my case, that .2 seconds that my eyes would've seen something may have saved me a visit to a body shop and paying my deductible for body work. 3. This sounds simple, but If/when you hear the forward collision warning, do not wait to see if the car will brake...immediately take control of the braking. The .1 second that I hesitated, lost me 1-2" of stopping and thus, THUMP. 4. I've considered widening the following distance in the future for stop and go traffic. My logic being that the farther away I follow the car in front of me, the more time to brake. Perhaps it is something to consider? When in stop and go traffic, widen your following distance? That is all. I hope that my experience helps someone else out. I just ordered my Model 3 (Performance) this morning and will be cautious when it replaces my merc as my daily driver.