It's worth spending just for the improvement to the average human driver. From what I've heard, policy makers are asking autonomous car designers what would be

It's worth spending just for the improvement to the average human driver. From what I've heard, policy makers are asking autonomous car designers what would be helpful on the roads, and the first thing they would like is just better road maintenance/design to existing standards (which is something the politicians are keen on because it's too boring to get any positive press).