perfectD

So how is the directioning?

If you add a line? 

A subway, a bus.. how are you connecting all of these systems?

Downtown vs. Uptown?

North or South?

West to East?

Inbound or Outbound?

If it goes from end to end, should be like, out to out... 

So, locally you have a direction.

Coordinate Axis = N,S,E,W and their combinations.