(svn r13621) -Fix: building roadbits in the wrong direction on bridges or building roadbits from underneath the bridge to the bridgehead is impossible, so don't silently ignore that error when building over houses and industries is not ignored.
--- a/src/road_cmd.cpp Tue Jun 24 09:15:45 2008 +0000
+++ b/src/road_cmd.cpp Tue Jun 24 11:42:01 2008 +0000
@@ -576,6 +576,7 @@
case MP_TUNNELBRIDGE:
if (GetTunnelBridgeTransportType(tile) != TRANSPORT_ROAD) return CMD_ERROR;
+ if (MirrorRoadBits(DiagDirToRoadBits(GetTunnelBridgeDirection(tile))) != pieces) return CMD_ERROR;
if (HasTileRoadType(tile, rt)) return_cmd_error(STR_1007_ALREADY_BUILT);
/* Don't allow adding roadtype to the bridge/tunnel when vehicles are already driving on it */
if (GetVehicleTunnelBridge(tile, GetOtherTunnelBridgeEnd(tile)) != NULL) return CMD_ERROR;
@@ -734,6 +735,7 @@
if (tile == end_tile && !HasBit(p2, 1)) bits &= ROAD_NW | ROAD_NE;
if (tile == start_tile && HasBit(p2, 0)) bits &= ROAD_SE | ROAD_SW;
+ _error_message = INVALID_STRING_ID;
CommandCost ret = DoCommand(tile, drd << 6 | rt << 4 | bits, 0, flags, CMD_BUILD_ROAD);
if (CmdFailed(ret)) {
if (_error_message != STR_1007_ALREADY_BUILT) return CMD_ERROR;