--- a/tile.h	Tue Jun 07 18:13:49 2005 +0000
+++ b/tile.h	Tue Jun 07 21:37:00 2005 +0000
@@ -103,4 +103,9 @@
 	return GetTileOwner(tile) == owner;
 }
 
+static inline bool IsLevelCrossing(TileIndex tile)
+{
+	return (_map5[tile] & 0xF0) == 0x10;
+}
+
 #endif