It is were it is because it is per economy. That is, if you have two distinct and not connecting road networks, you have two economy options. Therefore it would not be logical to move it to the bottom - everything there only exists once.
It is were it is because it is per economy. That is, if you have two distinct and not connecting road networks, you have two economy options. Therefore it would not be logical to move it to the bottom - everything there only exists once.