--- a/road_cmd.c	Tue May 09 08:25:31 2006 +0000
+++ b/road_cmd.c	Tue May 09 09:56:09 2006 +0000
@@ -125,7 +125,7 @@
 
 	switch (GetTileType(tile)) {
 		case MP_TUNNELBRIDGE:
-			if (!EnsureNoVehicleZ(tile, TilePixelHeight(tile))) return CMD_ERROR;
+			if (!EnsureNoVehicleOnGround(tile)) return CMD_ERROR;
 
 			if (!IsBridge(tile) ||
 					!IsBridgeMiddle(tile) ||