The Island Eastern Corridor (IEC) is an expressway built along the northeastern shore of Hong Kong Island in Hong Kong. It starts from Causeway Bay in the west and ends in Chai Wan in the east. It is mostly part of Route 4. The section between Causeway Bay and Quarry Bay consists mainly of viaducts built along Victoria Harbour. History After World War II, the Eastern District of Hong Kong Island developed rapidly. As a result, the major thoroughfare in the area, King's Road, became very congested. To relieve the issue of congestion, the idea of constructing an elevated vehicular corridor in the Eastern District was brought out in 1968, as part of the Hong Kong Long Term Road Study. The original plan was to construct an elevated dual carriageway above King's Road, which continues eastward as a ground-level road along the coastline between Sai Wan Ho and Chai Wan. Such an alignment along King's Road was later discarded in favour of a waterfront viaduct running parallel to King's Road. It was not until 8 April 1981, 20 May 1982 and 5 August 1986 that construction commenced on the three sections of the corridor, respectively. The corridor was opened in three phases: Causeway Bay to Taikoo Shing on 8 June 1984; Taikoo Shing to Shau Kei Wan on 26 July 1985; and Shau Kei Wan to Chai Wan on 12 October 1989. Work has been done to the expressway several times over its life, including the bridge diversions at Quarry Bay, completed in 2003, where Route 4 joins with Route 2. There is also a proposed extension of the Corridor into the hills of Chai Wan and Siu Sai Wan. The section of viaduct near City Garden has also been rebuilt and expanded so that it could become the eastern terminus of the Central–Wan Chai Bypass. In 2008, the Island Eastern Corridor became the new venue of the Hong Kong Marathon 10km race, held on 17 February 2008. The race track started from City Garden in North Point, and ran eastwards until Shau Kei Wan, where it made a U-turn, back along westbound IEC and ended at Victoria Park, near the western terminus of the IEC. The noise problem caused by the IEC's design became evident as residents complained about noises as high as 60 dB emitting at about five to six o'clock in the morning. In February 2008, the