[ghaff]

My assumption is that you get to this for some subset of highways in some subset of weather conditions with some special rules in place (maybe mandatory maintenance schedules?).

Which is actually a big win as long highways drives are boring and probably have a decent chunk of more serious accidents.

It doesn't give you the robo-taxi use cases that are what a lot of urbanites care about the most. But it would be a nice safety and comfort add-on for how a lot of people spend many hours of their weeks.