Index: trunk/data/validator/highway.mapcss
===================================================================
--- trunk/data/validator/highway.mapcss	(revision 15314)
+++ trunk/data/validator/highway.mapcss	(revision 15648)
@@ -158,2 +158,8 @@
   fixAdd: "railway=level_crossing";
 }
+
+node[highway=crossing][barrier=kerb].is_in_major_road {
+  throwWarning: tr("{0} together with {1}", "{0.tag}", "{1.tag}");
+  suggestAlternative: "kerb=*";
+  group: tr("suspicious tag combination");
+}