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The Port of London Authority (PLA) is a self-funding public trust established by The Port of London Act 1908 to govern the Port of London. Its responsibility extends over the Tideway of the River Thames and its continuation (the Kent/Essex strait). It maintains and supervises navigation, and protects the river's environment. The PLA originally operated all enclosed dock systems on the river (except the Regent's Canal Dock), but these have long been closed to commercial traffic, with the exception of Port of Tilbury, which was privatised in 1992. ==Limits== The PLA's responsibility extends from a point marked by an obelisk just downstream of Teddington Lock (the upstream limit of the tidal river) to the end of the Kent/Essex strait of the North Sea (between Margate to the south and Gunfleet Lighthouse, near Frinton-on-Sea, to the north,〔(【引用サイトリンク】page=108 )〕) a total of about 95 miles (150 km). The PLA does not cover the Medway or the Swale. From the City of London, via the Thames Conservancy, the PLA has inherited ownership of the bed of the river and foreshore from Teddington to the Yantlet Line (between Southend and Grain). During much of the 20th century the PLA owned and operated many of the docks and wharfs in the Port, but they have all now been either closed or privatised. Today the PLA acts mainly as a managing authority for the tidal stretch of the River Thames, ensuring safe navigation, and the well-being of the port and its activities. Comparable responsibilities for the river including, and upstream of, Teddington Lock fall to the Environment Agency. The PLA today has a number of statutory duties, including river traffic control, security, navigational safety (including buoys, beacons, bridge lights and channel surveys), conservation (including dredging and maintaining certain river banks), encouraging both commmercial and leisure uses of the river, and protecting its environment. The PLA is responsible for the operation of Richmond Lock, but it is not responsible for the Thames Barrier which is managed by the Environment Agency in its flood management role. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Port of London Authority」の詳細全文を読む スポンサード リンク
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