4.6 Retaining Walls
Retaining walls associated with interchanges may be gravity walls, reinforced concrete and reinforced soil types. Where large areas are exposed, the advice of a landscape architect on visual amenity should be sought. Consideration should be given in the design to means of preventing or removing graffiti from the surfaces of exposed walls.
The base of retaining walls should be protected by a safety barrier to provide protection from damage especially by trucks, or the wall should have a suitable concrete barrier profile constructed into its base. The wall should be located to provide for the ‘working width’ of trucks, an additional width to account for the tilting of trucks passing close to the wall (refer to AGRD Part 3 (Austroads 2010b)).