Index: trunk/data/validator/geometry.mapcss
===================================================================
--- trunk/data/validator/geometry.mapcss	(revision 12572)
+++ trunk/data/validator/geometry.mapcss	(revision 12708)
@@ -94,5 +94,6 @@
 way[natural=saddle],
 way[natural=volcano],
-way[natural=tree] {
+way[natural=tree],
+way[highway=motorway_junction] {
   throwWarning: tr("{0} on a way. Should be used on a node.", "{0.tag}"); 
 }