Driving through Mississippi back to Texas, there was a weigh station for large trucks on both sides of the highway. In the middle was what looked like a height radar to check if a truck went past the weigh station. We are extremely grateful that there was nobody behind us, but the car phantom braked from 85 to 10 MPH and it was so strong that everything in our car shifted forward, and I had a bit of struggle trying to reach the gas or brake pedal to stop the Full Self Drive.
I want to say this happened on the same exact place coming into Mississippi from Texas. We had maybe 8 phantom braking events take place and all were reported at the time of incident. If anyone was behind us (let's say a semi truck, or some a-hole in a large truck tail-gating you), it would have been really bad for us.
I'm honestly not sure what to do. We did not get any visual queues, no audial queues, just instant braking (as if the car were about to hit a brick wall) --- but I get an audial notification even if the car thinks I might hit a vehicle in front of me.
I know there's other phantom braking posts on here, but I wasn't sure if anyone has had it happen in FSD at max Auto Steering speed.
It would be nice if someone could help me get data out of my car and possibly make sense out of it to help fix the problem. I'm guessing that data is at least being sent to Tesla for them to fix. We have phantom brake spots all over our town that are reported every time we drive, and they are continuously missed (so far 3 updates have come through for FSD Beta, and none of them have fixed our phantom brake spots).
Some of the scariest ones are when the car goes over a bridge and thinks there's a stop light at the top of it (while on a major interstate highway). Yes it has lights, but they are underneath the highway, not on top of it where everyone is going 75 MPH.
And why was I going so fast? I was going the speed limit +5 and cars were flying past us - I had to increase speed some to prevent being hit or become a road rage target.
I guess the main lesson is, find a way to disable FSD at 75%+ max steering speed with something other than your feet, and figure out how to do it before the car loses 50% of its momentum or you may cause a backend collision.
Believe it or not, phantom braking and someone hitting you from behind is considered reckless driving (on your behalf), even if you blame it on your software. I believe reckless driving is a felony and comes with some jail time and major points off your license. As far as I can tell, anyone who blames a car accident on their software is immediately told that they are in control of the vehicle. I personally have to disagree with this only for phantom braking as this was something so powerful I could not disable the feature due to G-Forces.