runway lights for expansion to cope with steadily increasing air traffic. By the 1990s, Kai Tak had become one of the world's busiest airports – it far exceeded its annual passenger and cargo design capacities, and one out of every three flights experienced delays, largely due to lack of space for aircraft, gates, and a second runway. In addition, noise mitigation measures restricted nighttime flights, as severe noise pollution (exceeding 105 dB(A) in Kowloon City) adversely affected an estimated total of at least 340,000 people. A 1974 planning study by the Civil Aviation and Public Works departments identified the small island of Chek Lap Kok, off Lantau Island, as a possible future airport replacement site. Far away from the congested city centre, flight paths would be routed over the South China Sea rather than populous urban areas, enabling efficient round-the-clock operation of multiple runways. The Chek Lap Kok (CLK) airport master plan and civil engineering studies were completed towards the end of 1982 and 1983 respectively. In February 1983, however, the government shelved the project for financial and economic reasons. In 1988, the Port & Airport Development Strategy (PADS) Study was undertaken by consultants, headed by Mott MacDonald Hong Kong Limited, reporting in December 1989. This study looked at forecasts for both airport and port traffic to the year 2011 and came up with three recommended strategies for overall strategic development in Hong Kong. One of the three assumed maintaining the existing airport at Kai Tak; a second assumed a possible airport in the Western Harbour between Lantau Island and Hong Kong Island, and the third assumed a new airport at Chek Lap Kok. The consultants produced detailed analyses for each scenario, enabling Government to consider these appraisals for each of the three "Recommended Strategies". In October 1989, the Governor of Hong Kong announced to the Legislative Council that a decision had been made on the long-term port and airport development strategy for the territory. The strategy to be adopted was that which included a replacement airport at Chek Lap Kok and incorporating new container terminals 8 and 9 at Stonecutters Island and east of the island of Tsing Yi respectively. In the PADS study, the consultants advised that the earliest the airport could be opened was January 1998. However, in reaching the government's decision, this date was modified to January 1997, six months prior to the handover of Hong