--- a/src/road_cmd.cpp	Sun May 06 21:10:49 2007 +0000
+++ b/src/road_cmd.cpp	Mon May 07 11:24:23 2007 +0000
@@ -725,7 +725,7 @@
 	}
 
 	/* Return if full detail is disabled, or we are zoomed fully out. */
-	if (!(_display_opt & DO_FULL_DETAIL) || _cur_dpi->zoom == 2) return;
+	if (!HASBIT(_display_opt, DO_FULL_DETAIL) || _cur_dpi->zoom == 2) return;
 
 	/* Draw extra details. */
 	for (drts = _road_display_table[roadside][road]; drts->image != 0; drts++) {