2. The Hong Kong-Zhuhai-Macao Bridge connects the Hong Kong Special Administrative Region in the east and Zhuhai and Macao Special Administrative Regions in Guangdong Province in the west. It is an integral part of the ring road in the Pearl River Delta region, and it is also a key project across the Lingdingyang sea area in the national highway network planning, which will form a new highway transportation channel connecting the east and west banks of the Pearl River. The Hong Kong-Zhuhai-Macao Bridge is a super-large cross-sea passage connecting Hong Kong, Zhuhai and Macao, with a total length of 55 kilometers. When completed, it will become the longest sea-crossing bridge in the world. The main project of Qiaodao Tunnel Group is about 29 kilometers long, with the largest engineering quantity and the highest technical difficulty. The main project "Haizhong Bridge Tunnel" is 35,578 kilometers long, of which the submarine tunnel is about 6.75 kilometers long. When completed, it will be a part of G4- Beijing-Hong Kong-Macao Expressway and G94- Pearl River Delta Ring Expressway.
3. The immersed tube tunnel of Hong Kong-Zhuhai-Macao Bridge is the longest highway immersed tube tunnel in the world and the only deep-buried immersed tube tunnel in the world. There are a series of innovations in production and installation technology, which provide unique samples and valuable experience for the world's submarine tunnel engineering technology.