diff -r b9c3fec968b8 -r 04edde3eb0c6 src/ai/default/default.cpp
--- a/src/ai/default/default.cpp	Thu Feb 14 15:13:36 2008 +0000
+++ b/src/ai/default/default.cpp	Thu Feb 14 15:59:16 2008 +0000
@@ -2639,8 +2639,7 @@
 		_cleared_town = NULL;
 
 		if (p->mode == 2) {
-			if (IsTileType(c, MP_ROAD) &&
-					GetRoadTileType(c) == ROAD_TILE_NORMAL &&
+			if (IsNormalRoadTile(c) &&
 					(GetRoadBits(c, ROADTYPE_ROAD) & p->attr) != 0) {
 				roadflag |= 2;
 
@@ -2682,7 +2681,7 @@
 
 			if (GetTileSlope(c, NULL) != SLOPE_FLAT) return CMD_ERROR;
 
-			if (!IsTileType(c, MP_ROAD) || GetRoadTileType(c) != ROAD_TILE_NORMAL) {
+			if (!IsNormalRoadTile(c)) {
 				ret = DoCommand(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
 				if (CmdFailed(ret)) return CMD_ERROR;
 			}
@@ -2857,7 +2856,7 @@
 	if (dist <= a->best_dist) {
 		TileIndex tile2 = TILE_MASK(tile + TileOffsByDiagDir(_dir_by_track[track]));
 
-		if (IsTileType(tile2, MP_ROAD) && GetRoadTileType(tile2) == ROAD_TILE_NORMAL) {
+		if (IsNormalRoadTile(tile2)) {
 			a->best_dist = dist;
 			a->best_tile = tile;
 			a->best_track = track;
@@ -3740,7 +3739,7 @@
 
 		if (IsLevelCrossing(tile)) goto is_rail_crossing;
 
-		if (GetRoadTileType(tile) == ROAD_TILE_DEPOT) {
+		if (IsRoadDepot(tile)) {
 			DiagDirection dir;
 			TileIndex t;