One of the aspects of doing this blog is that I do a fair amount of traveling around the state. Some of that is on rural highways because that is my only choice. Sadly, the picture only sort of goes with my tale.
I tried to look it up and the closest thing I could see was that was about the distance that a person could walk and back in one day. I guess I could see that as towns would typically spring up along the trading routes. Before the invention of railroads, you would either have to walk or ride a horse. I can't imagine that a ladened horse would move much faster than a person.
Then I got to thinking about another thing. It seems like county lines are about 30 miles apart and maybe the towns are arranged along a grid within those counties. But I would imagine the county organization would come after the formation of some towns.
Honestly, I'm not sure but it is a good though exercise.