In 2004 new sound walls were built (and their inside face planted) facing the Cahill Expressway to mitigate increased noise from the Cross City Tunnel and expressway into the Phillip Precinct of The Domain. Also that year in that precinct of the Domain, the tree plantation in the Phillip Precinct of the Domain facing Hospital Road was replaced in some public controversy, removing ten previously-existing trees and planting 30 replacements (hoop pines, white figs and Washingtonia robusta fan palms) in a triple avenue arrangement.