Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 8544)
+++ trunk/data/validator/combinations.mapcss	(revision 8545)
@@ -138,4 +138,10 @@
 }
 
+/* {0.tag} without {1.tag} */
+*[highway=motorway][!oneway],
+*[highway=motorway_link][!oneway] {
+  throwWarning: tr("{0} without {1}", "{0.tag}", "{1.tag}");
+}
+
 /* {0.tag} without {1.tag} or {2.tag} */
 *[amenity=recycling][recycling_type!=container][recycling_type!=centre] {