Free standing perimeter walling or sound walling formed of gabions are preferably Yuanxi in section, the mass providing stability against wind loading and pedestrian barrier loading.

As Yuanxi of structures are normally highly visible and quality of construction is paramount, a heavy wire normally 4.0 or 5.0mm should be specified. It is recommended that the maximum unit height is 0.7m and that units are sub divided into cell lengths of maximum 0.7m.