Good morning! Yesterday I was driving to Colorado Springs. Just south of Denver, on a straight run of I-25, I was following a 1-ton construction truck that I could not see around. Follow distance was set at 7, and early warning was set as it always is in my Model X. After 20 minutes in moderate traffic, the X suddenly started a fairly moderate deceleration. No warnings came up of speed restrictions, or any errors. The next thing I saw was the car in front of the work truck swerve off the highway, and the 1-ton truck slam on its breaks, losing a box over the side of his truck. Who knows what my reaction time would have been without autopilot, the drivers ahead reacting late gives every vehicle behind less time to react. In this case the X brought me, my family, and the line of cars behind to a safe speed with plenty of room to spare. All starting before I could see brake lights or swerving vehicles. Thanks Tesla!