New 2018 Model S 75D owner here. Something that makes autopilot almost non usable for me is driving down a four lane Hwy. a car crosses 3-400 feet in front of you and the Model S slams on it's breaks for a second. This almost cause an accident as I had someone tailgating me while I was in the passing lane. It does this a lot, is this normal? All my driving is down these 4 lane highways so people turning out in front of me is quite common. I turned the following distance down to 1 car thinking it would reduce the sensor range but it didn't help. Any suggestions or learn to live with it or don't use it? Thanks for your time.