This is a progressive, good idea.
It will save 24,000 injuries a year.
I think if Hacker News was around when seat-belts were invented there would be some looney tunes claiming it's an abuse of first amendment rights or some rubbish.
The next thing should be mandatory lane keeping.
My car's warning system lost its mind as I approached the car in the right lane. I accelerated through the situation and into the left lane because I knew speeding up was contextually appropriate.
Had the car possessed an automatic braking system, the car disastrously would have jammed on the brakes with me mid-lane-change. That would not have been pretty in heavy highway traffic.
This is what it is promised it will do. What it will do is what it can, with the resources that are left over for development and safety - once shareholders and execs are satisfied (per scotus: Dodge vs Ford).