Fix this version.

Routenplaner/src/de/th_mannheim/informatik/routenplaner/domain/City.java

@@ -31,6 +31,10 @@ public class City {
 			this.distance = distance;
 			this.predecessor = predecessor;
 			System.out.println(name + " " + distance + " <- " + predecessor);
+			
+			for (Street s : neighbors) {
+				s.setUnused();
+			}
 		}
 	}
 	

Routenplaner/src/de/th_mannheim/informatik/routenplaner/domain/Street.java

@@ -48,6 +48,11 @@ public class Street implements Comparable<Street> {
 	public void setUsed() {
 		used = true;
 	}
+	
+	public void setUnused() {
+		used = false;
+	}
+	
 	public String toString() {
 		return start.getName() + " -> " + destination.getName() + ": " + distance + " km";
 	}