Index: trunk/data/validator/unnecessary.mapcss
===================================================================
--- trunk/data/validator/unnecessary.mapcss	(revision 13301)
+++ trunk/data/validator/unnecessary.mapcss	(revision 13302)
@@ -17,5 +17,5 @@
 area:closed[building][area?],
 area:closed[landuse ][area?][!highway],
-area:closed[leisure ][area?][!highway],
+area:closed[leisure ][area?][!highway][leisure!=track][leisure!=slipway],
 area:closed[natural ][area?],
 area:closed[shop    ][area?] {