"Reasonable and prudent" is a horrendously ambiguous term that is not going to stand up in any court of law when a vehicle brake checks for no reason, whatsoever.
It'll stand up fine, because the guy who hit his brakes in front of you isn't the one on trial- the person who was following too closely and rear-ended him was.
"Too closely to stop" is not reasonable and prudent.
Defining "too closely" requires quantifiable measures (i.e. distance in units such as feet or car lengths), not ambiguous ones that are only qualitative and judgement calls.
I mean- pretty clearly it does not- since "reasonable and prudent" is the law in most US states, and has been for years or decades depending on the state. And it's widely and generally enforced as such.
Thus leaving it to the judgement of the officer issuing the citation, and the prosecutor handling the case, and the judge deciding it, seems to suffice just fine without more specific quantifiable measurements.
A great way to not have to worry about this is- don't tailgate people. Follow at a distance that would allow your car to stop without hitting the guy in front of you if he slamed on his brakes.
Especially in states where deer are known to just sprint across even interstates and the guy in front of you might slam on
his brakes at any time.
And the perspective that leaving enough space to always avoid an accident if being brake checked is reasonable and prudent does not come from those who live and drive in bigger cities such as Atlanta (where I learned to drive).
That's adorable.
I learned to drive in NY.
Still have managed to not rear-end anybody, either when I lived/drove there.... or LA... or any of the other bigger-than-atlanta cities I've driven in.....because I don't follow too closely.
Keeping the car length for every 10MPH rule of thumb will keep a driver constantly slowing as others merge into the space. And more and more studies are showing that the slower drivers are the ones who cause more accidents on freeways, though they often are not even involved.
And yet, again, the facts we actually have disagree with your opinion.
For example-
In the 1st quarter of 2019 Tesla registered one accident for every 2.87 million miles driven in which drivers had Autopilot engaged.
For those driving without Autopilot, they registered one accident for every 1.76 million miles driven.
Meaning a higher decel rate, then add that 0.3 seconds for the car behind it, and it brakes even harder. It is the accordian affect, and if traffic is heavy, there WILL be a collision.
The data shown in the original post is not a "high decel rate though" so blaming AP for something it's not doing seems odd.
Anybody hits you with the decel rate shown- that's their fault and they were following way too closely.
I've been pulled over for following too closely, actually.
That ain't surprising
At the end of the day, this all boils down to one thing that drivers depend on from other drivers - predictability.
That'll be the nice thing with FSD- especially as it comes to a lot of cars... it'll be way more predictable than humans who can't even agree among each other how to drive.
The TACC/AP often behaves in ways that are very unpredictable.
So do humans.
From the (admittedly thin) data we have so far though- AP is doing a better job than humans are avoiding accidents.
However, with the type of braking that OP measured I would agree that if someone hit him it would be their fault.
Exactly.
If the data from the OP is what they mean by "phantom braking" it's an utter non-issue unless someone is directly tailgating you at insanely dangerously close distances.