You might know all of this already: The moons are basically gas stations. You can go there and fill up on as much liquid fuel as you will ever need. Also, you can beam down to your home planter from literally anywhere, by using the teleporter (rather than hitting the beam to planet shortcut on the right).
The bus depot can be a hub, so each areas goes to the depot. A person can go from the residential area to the depot, then transfer to the University/Office line, or the industrial line. That will get rid of the overlap.