Supposedly to stop the car if impaired, but what happens if you are injured in the middle of nowhere without a cell signal and you need to get to a hospital fast? You'd be fucked if the car says nope, it won't let you run over any passing hedgehogs at 3:00am just because you are ~~looking drunk~~ bleeding out. Why won't someone think of the children... On a social level they really want to end car use and force people to congregate into urban areas where they can run public transport, because you can't block a road with a bus you don't own, and you can't escape the nigger if you can't flee to the countryside