Index: src/road_cmd.cpp
===================================================================
--- src/road_cmd.cpp	(revision 12288)
+++ src/road_cmd.cpp	(working copy)
@@ -1064,9 +1064,12 @@
 
 		if (height < minz) return;
 	}
+	
+	/* If there are no road bits, return */
+	if (CountBits(road) < 2) return;
 
 	/* Draw extra details. */
-	for (drts = _road_display_table[roadside][road]; drts->image != 0; drts++) {
+	for (drts = _road_display_table[roadside][road|tram]; drts->image != 0; drts++) {
 		DrawRoadDetail(drts->image, ti, drts->subcoord_x, drts->subcoord_y, 0x10);
 	}
 }