The Hong Kong – Zhuhai – Macao Bridge (HZMB), being situated at the waters of Lingdingyang of Pearl River Estuary, is the world's longest sea-crossing bridge made up of three navigable sections, one undersea tunnel and two main artificial islands. It consists of a Main Bridge in Mainland waters together with the boundary crossing facilities and link roads within the three places. The functions of the Bridge are to meet the demand of passenger and freight land transport among Hong Kong, the Mainland (particularly the region of Pearl River West) and Macao, to establish a new land transport link between the east and west banks of the Pearl River, and to enhance the economic and sustainable development of the three places. Opened on October 24, 2018, it cuts the road travel time between Hong Kong and Zhuhai/ Macau from 3 hours to 40-50 minutes.