[ Passau ]
-> { flow: down; } [ Siegen ]
-> { flow: right; } [ Regensburg ]
[ Siegen ] -> { flow: left; } [ Aschaffenburg ]
[ Passau ]
-> { flow: down; } [ Siegen ]
-> { flow: right; } [ Regensburg ]
[ Siegen ] -> { flow: left; } [ Aschaffenburg ]