Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 15433)
+++ trunk/data/validator/combinations.mapcss	(revision 15467)
@@ -128,5 +128,6 @@
 }
 
-/* {0.tag} without {1.key} (warning level) */
+/* {0.tag} without {1.key} (warning level), #18246 */
+way[highway=construction][!construction],
 node[traffic_sign=maxspeed][!maxspeed],
 node[actuator=manual][!handle],