Winding up our first 3000 mile road trip in our 2020 model 3, we were traveling East on Interstate 10 west of Baton Rouge. Traffic was very heavy but moving at about 70 miles an hour. I was in the center lane using autopilot when a car moving up in the left lane at about 80mph swerved in front of me all the way into the right-hand lane. I had to jerk the wheel right and hit the brake to avoid having my left front hit by this Yahoo. We missed an accident by inches. Curious why the car did not respond to this near collision. Does the crash avoidance only work from the front?