/* limit the bits to delete to the existing bits. */

			c &= present;

			if (c == ROAD_NONE) return CMD_ERROR;

			if (flags & DC_EXEC) {

				ChangeTownRating(t, -road_remove_cost[(byte)edge_road], RATING_ROAD_MINIMUM);

				present ^= c;

				if (present == ROAD_NONE) {

					RoadTypes rts = GetRoadTypes(tile) & ComplementRoadTypes(RoadTypeToRoadTypes(rt));

					if (rts == ROADTYPES_NONE) {

						DoClearSquare(tile);

					} else {

						SetRoadBits(tile, ROAD_NONE, rt);

						SetRoadTypes(tile, rts);

					}

				} else {

					/* When bits are removed, you *always* end up with something that

					 * is not a complete straight road tile. However, trams do not have

					 * onewayness, so they cannot remove it either. */

					if (rt != ROADTYPE_TRAM) SetDisallowedRoadDirections(tile, DRD_NONE);

					SetRoadBits(tile, present, rt);

					MarkTileDirtyByTile(tile);

				}

			}

			return CommandCost(COUNTBITS(c) * _price.remove_road);

		}