I can't think of any other mode of transportation in the world that uses one-way loops other than systems that deliver everyone to the same destination or scenic roads (i.e. Airport parking garages, airport terminal trams, Walt Disney World parking trams, the road around Stone Mountain). This system is like have two office buildings trying to share the same elevator. In tower A the elevator only goes up and then at the roof it moves over to tower B where it only goes down. If you are in tower B and want to go up 10 floors you either have to ride the elevator all the way around or take the stairs.