Just had my first experience of AP1 unexpectedly and incorrectly reacting to an underpass. I had read about this but never before experienced it.
I was driving on a divided road, a parkway with a grass median bordered by prominent granite curbs, two lanes in each direction, with cross streets and traffic signals. The car was approaching a railroad bridge over the road, and the road has a slight curve to the right. There were no vehicles in sight ahead in either of the two lanes. The weather was cloudy, so if the bridge was casting a shadow it was subtle. Posted speed was 30 mph (we were passing a school) and speed was set for about 35. AP1 was engaged. Suddenly the warning sound blared and the car braked sharply. i did not have time (or maybe the presence of mind) to note what was on the instrument cluster as I focused on the road ahead and disabled AP to resume speed and avoid getting rear ended.
I made a bug report shortly after this incident, but Tesla gives you so little time to say anything that I doubt my report was clear enough for action. (And I am a bit skeptical of whether such reports are helpful.)
This incident shook me up, and I sure hope Tesla fixes whatever is causing this type of behavior, and soon! I saw absolutely nothing that a driver would consider dangerous or would slow down for. I have driven thousands of miles with AP, and I guess I have been lucky not to experience this particular glitch. I have had unexpected slowdowns, but not like this with warning horns and so on.
I am glad I had no passengers with me (especially my spouse), It would definitely have undermined anyone's confidence in the car.
Was this in MA and if so where specifically?