A road is also closed when it forms a complete loop. If a part of a closed road has a color that no player is using, nothing is played on that part. http://riograndegames.com/uploads/Game/Game_313_gameRules.pdf This is from the rules for Die Kinder von Carcassone. As this is German for "The Kids of Carcassone", I assume it is the same game.

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