Nam Wan Tunnel is one of the major elements of Route 8 between Tsing Yi and Cheung Sha Wan linking the existing Cheung Tsing Highway and the proposed Route 8 East Tsing Yi Viaduct.  Valued at HK$1.48 billion, the contract covers a 1.2-kilometre dual 3-lane highway tunnel in Tsing Yi Island and a portal building on the east side of Nam Wan Tunnel, a west portal structure on the west side thereof and a West Control Building where the Colt's louvers are installed.  The louvre installation work in this project is quite challenging as they are installed with curvature from left to right and with the whole curved louvre wall slandered from top to bottom.