Index: trunk/data/validator/combinations.mapcss
===================================================================
--- trunk/data/validator/combinations.mapcss	(revision 14980)
+++ trunk/data/validator/combinations.mapcss	(revision 14986)
@@ -243,5 +243,6 @@
 }
 
-/* {0.tag} together with {1.tag}, see #17542, #16861, #16147, #10186 */
+/* {0.tag} together with {1.tag}, see #17592, #17542, #16861, #16147, #10186 */
+way[tracktype=grade1][surface][surface=~/^(unpaved|compacted|gravel|fine_gravel|pebblestone|ground|earth|dirt|grass|sand|mud|ice|salt|snow|woodchips)$/]
 way[segregated][bicycle=no],
 way[segregated][foot=no],