‘the roads were concave in shape making it difficult to move heavy objects along them’
making me believe the heavy objects pushed down the road made the road concave.
“making me believe the heavy objects pushed down the road made the road concave.”
The friction to overcome would be enormous........
I was thinking that the roads were first used to transport the things. Along with statues along the way. After the statues were in place the people went to go worship them (or whatever).
Hundreds of years of walking along those same routes as they went to and fro to worship could have caused the concave shape.