The overtext below is true.
The overtext above is false.
Roads for square wheels would need to be paved or masoned, since dirt wouldn't hold the required shape well. That would make them expensive.
Could well be. The steampunk timeline did most things the hard way.
Also, turning would be problematic.
Merely very uncomfortable, I suspect
The roads would be more like railroads than general-purpose roads. Just imagine the complexity of building a square-wheel parking lot.