> For car width, I think that that's also a pretty reasonable width, since it's the perfect width to fit two people side-by-side comfortably, with a bit of room

> For car width, I think that that's also a pretty reasonable width, since it's the perfect width to fit two people side-by-side comfortably, with a bit of room in the middle. How do you know the width of a standard human isn't determined by 2000 years of people choosing partners that would fit beside them on a cart comfortably.