西區海底隧道
The section between Tsing Yi and Cheung Sha Wan, formerly known as Route 9, is a dual 3-lane expressway. This section consists of the Stonecutters Bridge, which spans the Rambler Channel from Stonecutters Island and links with the Lantau Link through the Nam Wan Tunnel and West Tsing Yi viaduct and was opened on 20 December 2009. This section provides traffic with a more direct route to the Lantau Link, particularly vehicles from Tsim Sha Tsui and Western Harbour Crossing, previously vehicles had to use Route 3 (Cheung Tsing Bridge and Cheung Tsing Tunnel).