--- a/src/road_func.h	Thu Jan 17 20:00:13 2008 +0000
+++ b/src/road_func.h	Thu Jan 17 20:41:33 2008 +0000
@@ -136,6 +136,6 @@
  */
 RoadTypes GetPlayerRoadtypes(const PlayerID p);
 
-void UpdateLevelCrossing(TileIndex tile);
+void UpdateLevelCrossing(TileIndex tile, bool sound = true);
 
 #endif /* ROAD_FUNC_H */