Index: trunk/resources/data/validator/combinations.mapcss
===================================================================
--- trunk/resources/data/validator/combinations.mapcss	(revision 17245)
+++ trunk/resources/data/validator/combinations.mapcss	(revision 17247)
@@ -876,2 +876,14 @@
   assertNoMatch: "way highway=residential bicycle=use_sidepath";
 }
+
+/* #19980 */
+way[highway=living_street][maxspeed][get(split(" ", tag(maxspeed)), 0) > 20] {
+  throwWarning: tr("{0} together with {1}", "{0.tag}", "{1.tag}");
+  group: tr("suspicious tag combination");
+  assertNoMatch: "way highway=living_street";
+  assertNoMatch: "way highway=living_street maxspeed=20";
+  assertNoMatch: "way highway=living_street maxspeed=\"20 mph\"";
+  assertNoMatch: "way highway=living_street maxspeed=walk";
+  assertMatch: "way highway=living_street maxspeed=30";
+  assertMatch: "way highway=living_street maxspeed=\"30 mph\"";
+}