1) Stop signs seem to be picked up universally. In my testing, it picked up signs even when they were partially obscured by parked cars or vegetation -- included one I might have missed myself. It did have something of a challenge with a stop sign that was raised up on the end of an open gate. It seemed to feel that was a sign in the distance. On the very interesting front: It did not display a sign warning of a stop sign ahead as a stop sign, even though it was very similar.
2) All lights are stop lights, even those that are oriented horizontally or have just a single flasher, seem to get picked up and displayed as a vertical stoplight. This isn't at all a bad thing. It shows that it can collect all the variations and treat them as a class of objects. It seems to accurately display the color of the light no matter the orientation.
3) Trash containers ... I can only assume that Tesla has been using trash containers as obstacles in training. Otherwise, I'm not sure why this semi-random object would be visualized. Or why the system would be so insanely good at picking them up, even when they're 20' back from the road, or overturned.
4) Road signage. At first I thought the display was just imaging what's on the road, but then I went over a combo marker for right turn / straight and the display broke it into two symbols. Which makes me think that it's doing far more than just imaging. It's interpreting these symbols. It also seemed to make at least one mistake. For one clearly marked straight ahead arrow, it displayed a strange "X" symbol with a loop over it.
5) Parking lot arrows. The system also seems to pick these up, though it did have some trouble with arrows that were badly worn. QUESTION: Has anyone with Smart Summon seen the reading of arrows play into how it's responding in this release?