Index: trunk/resources/data/validator/combinations.mapcss
===================================================================
--- trunk/resources/data/validator/combinations.mapcss	(revision 17216)
+++ trunk/resources/data/validator/combinations.mapcss	(revision 17218)
@@ -123,5 +123,5 @@
 way[railway=construction][!construction],
 way[highway=construction][!construction],
-node[traffic_sign=maxspeed][!maxspeed],
+node[traffic_sign=maxspeed][!maxspeed][!/^maxspeed:.+/],
 node[actuator=manual][!handle],
 node[emergency=fire_hydrant][!fire_hydrant:type],
@@ -144,4 +144,5 @@
   throwWarning: tr("{0} without {1}", "{0.tag}", "{1.key}");
   group: tr("missing tag");
+  assertNoMatch: "node traffic_sign=maxspeed maxspeed:hgv:conditional=\"80 @ (weight>7.5 AND 22:00-05:00)\"";
 }