Oh, and as for priorities: the cost of eliminating danger from traffic to where it is "trivial" or "absent" probably isn't financially viable. Meaning you'd ha

Oh, and as for priorities: the cost of eliminating danger from traffic to where it is "trivial" or "absent" probably isn't financially viable. Meaning you'd have to spend an inordinate amount of money for ever slimmer returns. If you follow how rules and regulations aimed at making traffic more secure over time you'll notice that the incremental improvements are becoming smaller and smaller. In most sensible jurisdictions, the important, big stuff that saves lots of lives is in place and people are now bickering over the little stuff that is perhaps going to same a small number of people. Or, in many cases, won't save a single person, might even cause more accidents, but generates more revenue. If you want to analyze something in terms of value to society you'll have to be prepared for a lot of unpleasant aspects.