I had a very interesting experience today with FSD shifting into reverse. Yes, I know the ability to go into reverse has been greatly debated and from videos posted so far I have been skeptical. But today I had it go into reverse, and it was quite undeniable and aggressive. Furthermore, it did not happen when trying to exit a tight parking spot or at an intersection where it pulled too far out. Rather, this happened in the middle of a road, slowing, then reversing, from 41 mph.
There is a truck in the opposite lane of a two-lane road. While the truck was not over the centerline, it was very close. If I had been driving myself, I wouldn't have thought twice about continuing. But, for whatever, reason FSD predicted a conflict with the truck. So my car came to a stop, then reversed several feet until the truck passed. Then it continued forward.
Unfortunately since this happened rather quickly and it was totally unexpected, I didn't get the chance to look at the display and see what the PRND indicator said, nor did I attempt to hit the accelerator while the car was backing. So these behaviors are still unknowns.
And before someone chimes in and says "the car just coasted backwards," note that I was going down a rather significant hill and, in fact, after the car initially stops, it coasts forward a few inches before reversing.
I am attaching the front, left repeater, and rear camera views. It is most apparent how quickly and aggressively the car backed from the repeater and rear cameras.