The Tube Transport System is a form of mass transit. A user announces where he or she wishes to go, and the tube will activate and route them to their desired destination. Users go head first into the tube, giving the user a chance to land on their feet.
The Tube Transport System is apparently free of charge, though users may be tracked using biometrics and charged directly to their bank accounts.
The TTS seems to be based on old pneumatic tubes, originally used to transport documents throughout offices (in fact, this can still be seen at the Central Bureaucracy).