A road I travel frequently has 2 lanes each direction with a turn lane in the middle. The turn lane is used frequently to access the many businesses along the road, and the speed limit is 45. My car slams on the brakes without warning when someone far away turns across the road in front of me from the two-way left turn lane while I am on Autopilot or FSD. It does not release until the car has cleared the path in front of me unless I intervene. The actions are unsafe for drivers behind me. This is usually at distances where the car turning is just appearing in the display -- a long way away. The weather is clear, sunny days. I have Following Distance set to 1, and emergency obstacle warnings set to low, but I do not think these settings have any bearing. This is a 2020 S LR, 6/2020 build, with latest software. Any suggestions?