>For some values of 'human' e.g. alert, sober. Which is sadly, a minority?

I think the vast majority of human drivers are alert and sober. It's the long tail of drunk / aggressive / distracted drivers that causes crashes.

>Its arguable that self-driving cars are better already. What we need to do is, secure the roads so they won't get confused (fence them & remove pedestrians/bikes). I know, we can't do that everywhere but we could do it for long-haul etc. Like freeways already do.

I mean as a human driver, I obviously love limited access roads (and human drivers perform very well on limited access roads). We won't have more of those though - the cultural paradigm for urban planning is one of tearing down freeways, adding bike-lanes, and ensuring pedestrian friendliness for maximum walkability.