Index: trunk/data/validator/geometry.mapcss
===================================================================
--- trunk/data/validator/geometry.mapcss	(revision 11138)
+++ trunk/data/validator/geometry.mapcss	(revision 11146)
@@ -103,4 +103,5 @@
 node[leisure=park][natural=tree] {
   throwWarning: tr("{0} together with {1} on a node. Remove {0}.", "{0.tag}", "{1.tag}");
+  group: tr("suspicious tag combination");
   fixRemove: "leisure";
 }
@@ -289,2 +290,9 @@
   throwError: tr("Coastline inside {1}", "{0.tag}");
 }
+
+/* #10471 */
+way[waterway] > node[ford?] { set ford_on_waterway; }
+way[highway] > node[ford?] { set ford_on_highway; }
+node[ford?]:in-downloaded-area!.ford_on_waterway, node[ford?]:in-downloaded-area!.ford_on_highway {
+    throwWarning: tr("{0} should be on the node where {1} and {2} intersect", "ford", "highway", "waterway");
+}