ITT: People who've never done any research on this issue making very American conclusions. Confusion about how these roads work is actually good. It may seem paradoxical at first, but easy to understand roads with ample signage actually breed high speeds, congestion, complacency, and dead pedestrians. Many dangerous intersections have found that removing signage and leaving it up to drivers drastically reduces speeds…
There exist optimization criteria besides "reduce the number of deaths". In particular, the enjoyment of drivers is an important optimization criterion.
I grant you that it certainly is a criterion for optimization, but I would call it important only for race tracks, not public roads.