struct { TileIndex opposite_tile, next_tile_1, next_tile_2; TrackBits opposite_track, next_track_1, next_track_2; } table[] = {

    { TileDiffXY(-1,  1), TileDiffXY( 0,  1), TileDiffXY(-1,  0), TRACK_BIT_LEFT,  _settings_game.pf.forbid_90_deg ? TRACK_BIT_X | TRACK_BIT_RIGHT : TRACK_BIT_3WAY_NE, _settings_game.pf.forbid_90_deg ? TRACK_BIT_Y | TRACK_BIT_RIGHT : TRACK_BIT_3WAY_SE },

    { TileDiffXY(-1, -1), TileDiffXY(-1,  0), TileDiffXY( 0, -1), TRACK_BIT_LOWER, _settings_game.pf.forbid_90_deg ? TRACK_BIT_Y | TRACK_BIT_UPPER : TRACK_BIT_3WAY_NW, _settings_game.pf.forbid_90_deg ? TRACK_BIT_X | TRACK_BIT_UPPER : TRACK_BIT_3WAY_NE },

    { TileDiffXY( 1, -1), TileDiffXY( 0, -1), TileDiffXY( 1,  0), TRACK_BIT_RIGHT, _settings_game.pf.forbid_90_deg ? TRACK_BIT_X | TRACK_BIT_LEFT  : TRACK_BIT_3WAY_SW, _settings_game.pf.forbid_90_deg ? TRACK_BIT_Y | TRACK_BIT_LEFT  : TRACK_BIT_3WAY_NW },

    { TileDiffXY( 1,  1), TileDiffXY( 1,  0), TileDiffXY( 0,  1), TRACK_BIT_UPPER, _settings_game.pf.forbid_90_deg ? TRACK_BIT_Y | TRACK_BIT_LOWER : TRACK_BIT_3WAY_SE, _settings_game.pf.forbid_90_deg ? TRACK_BIT_X | TRACK_BIT_LOWER : TRACK_BIT_3WAY_SW },