Index: trunk/resources/data/validator/unnecessary.mapcss
===================================================================
--- trunk/resources/data/validator/unnecessary.mapcss	(revision 17630)
+++ trunk/resources/data/validator/unnecessary.mapcss	(revision 17947)
@@ -1,4 +1,3 @@
 *[access][highway=proposed],
-*[motor_vehicle?][!vehicle][!access][bicycle_road!=yes][highway =~ /^(motorway|motorway_link|trunk|trunk_link|primary|primary_link|secondary|secondary_link|tertiary|tertiary_link|unclassified|residential|service|living_street)$/],
 *[bridge=no],
 *[building=no],
@@ -12,4 +11,9 @@
   assertMatch: "way bridge=no";
   assertMatch: "way highway=proposed access=no";
+}
+
+/* #19996 */
+*[motor_vehicle?][!vehicle][!access][bicycle_road!=yes][highway =~ /^(motorway|motorway_link|trunk|trunk_link|primary|primary_link|secondary|secondary_link|tertiary|tertiary_link)$/] {
+  throwOther: tr("{0} is optional on {1}", "{0.tag}", "{4.tag}");
   assertMatch: "way highway=motorway motor_vehicle=yes";
   assertNoMatch: "way highway=motorway access=no motor_vehicle=yes";