Roads system makes no sense
If it did not already exist, anyone who suggested the casual and completely uncontrolled use of road vehicles, travelling at different speeds and passing within inches of each other at closing speeds of several hundred kilometres per hour, sharing the same track, mixed up with cyclists, pedestrians and animals, without any proper guidance or signalling systems would be considered completely insane, especially given our obsession with health and safety today.
Humans are not infallible: everyone makes mistakes, loses concentration and can be careless.
Driving tests cannot prevent deliberate recklessness. Therefore, it is quite astonishing that casualty rates are not far higher.