The closed system of the car is more efficient. It's not clear that allowing cars to travel at speeds that makes it impossible for them to share roads with pede

The closed system of the car is more efficient. It's not clear that allowing cars to travel at speeds that makes it impossible for them to share roads with pedestrians is globally efficient. Really, allowing cars at all is a concession to global efficiency. In that light, one can see the benefit to abridging driver's generally assumed right to utterly dominate any place they aren't completely prohibited.