> (I instinctively slammed on the brakes immediately, though the car also beeped loudly so I suspect it also would have hit the brakes anyway)
Interesting, I would have thought that when (if) the autopilot intervenes it would be way faster than human reaction.
I have no car with similar features but I remember renting a VW golf that had some adaptive cruise control, the simple "keep the speed constant" worked just fine (like in older, simpler cruise controls) but the "adaptive" part was (IMHO, and it may well be a specific/single issue of the car or some settings that I knew not how to regulate) very, very cautious.
On the highway, driving in the left lane at a speed of 120 km/h, every time a car a long distance ahead (100 metres or more) merged from right lane to left lane the car would suddenly slow down/brake long before I would have normally done manually (and often without need as the car was travelling at my same speed or nearly so), it was, if not uncomfortable, "strange".