Index: trunk/resources/data/validator/combinations.mapcss
===================================================================
--- trunk/resources/data/validator/combinations.mapcss	(revision 18524)
+++ trunk/resources/data/validator/combinations.mapcss	(revision 18527)
@@ -5,4 +5,7 @@
 way[surface=~/^(unpaved|compacted|gravel|fine_gravel|pebblestone|ground|earth|dirt|grass|sand|mud|ice|salt|snow|woodchips)$/] { /* without grass_paver as it is controversial */
   set unpaved_surface;
+}
+way[surface=~/^(paved|asphalt|cobblestone|cobblestone:flattened|sett|concrete|concrete:plates|paving_stones|metal|wood|unhewn_cobblestone)$/] {
+  set fully_paved_surface;
 }
 
@@ -327,5 +330,7 @@
 way[junction=yes][highway],
 way[tracktype=grade1][surface].unpaved_surface,
-way[tracktype=grade2][surface][surface=~/^(sand|mud)$/],
+way[tracktype=grade2][surface][surface=~/^(sand|mud|ground|earth|dirt|grass|ice|salt|snow|woodchips)$/],
+way[tracktype=grade4][surface].fully_paved_surface,
+way[tracktype=grade5][surface].fully_paved_surface,
 way[segregated][bicycle=no],
 way[segregated][foot=no],