Something happened on the drive to Boston last week that makes we wary of trusting the FSD feature of my Tesla model Y. I was on the NY State Thruway going north, a few miles south of the exit for I-90E to Boston, in FSD mode, in the right lane, when I see a hundred yards or so ahead a car with flashing lights in the shoulder. Before waiting to see what FSD would do, I signaled a left turn, which is a clever feature that tells the FSD software to switch lanes. It started to do so, then the software must've noticed the car with the flashing lights and inbetween the two lanes it hit the brakes hard, and slowed us down to a dangerous speed, esp if there had been a car behind us. But there was absolutely no danger. The car in the shoulder wasn't even close enough to make a difference if we had remained in the right lane, but we were leaving it. And it tried to stop us in no man's land. Insane. Anyone seeing this behavior would have thought I was drunk. So next time something like that happens if I'm in FSD mode, I'm going to cancel it by turning the steering wheel slightly and taking over fully. I have trouble believing people who let this thing drive without overriding it regularly.