The Mayor's Ambient Noise Strategy - Greater London Authority

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The Mayor’s Ambient Noise Strategy Mayor of London 263 canyons can reduce opportunities for polluted air to disperse. In practice, most urban streets have frequent junctions with side streets. Streets-for-People Areas where a comprehensive package of measures are aimed at improving the street environment to enhance the sense of community, increase priority for public transport, walking and cycling, and improve social inclusion. Sustainable mobility services Systems proving people with easy, linked access to and information on a range of transport options, such as city cars, bicycles, taxis and trains, so that people can obtain the optimum means of mobility for each trip, rather than using the same vehicle for every trip. TEL Transit Exposure Level, a noise descriptor used, for example, where there is a small number of distinct noise events, such as one or two night freight trains (see ISO/DIS 3095: 2001). Temporary threshold shift most commonly noticed as a temporary dullness in hearing when a person has been exposed to loud noise. Recovery time depend on factors such as loudness and duration of noise exposure. Insufficient recovery time - such as when noisy working conditions are followed by leisure exposure - may mean loss becoming permanent. See also Permanent threshold shift. Tinnitus Typically ‘ringing in the ears’. The disorder can also take the form of a buzzing or an engine sound in the ears, either continuously, or intermittently. Some sufferers can associate onset with a particular period of high noise exposure. Tonal noise Where much of the sound energy is concentrated into narrow frequency bands. Touch and go is a landing by an aircraft which is immediately followed by a take off, often used in training and test flights. Tranquillity There are many possible dimensions to tranquillity. It includes relative quiet, relative absence of sounds associated with human activity, particularly mechanised. Human perception of tranquillity may be influenced by the character of a place, including visual quality, as well as by its soundscape. Unitary Development Plan Statutory plans produced by each borough which integrate strategic and local planning responsibilities through policies and proposals for development and use of land in their area.
264 Mayor of London The Mayor’s Ambient Noise Strategy Under Government proposals, they may be replaced by Local Development Frameworks. Urban street canyon see Street canyon. UIC Union International de Chemins de Fer, international railway organisation. Vibration Is the oscillation of a mass in relation to a reference point, perceived by people other than by hearing (see Appendix A2). Westerly operations When aircraft make their final approach to land from the east, and take off towards the west. Westerly preference A system of westerly preference was introduced at Heathrow in 1962. It means that aircraft land from the east, and take off towards the west, unless wind direction and speed is such as to require operating in the reverse direction (easterly, see above). Optimally, aircraft take off and land into the wind, but can both take off and land with a moderate tail wind. Westerly preference at Heathow reduces the number of take offs over the more highly populated areas east of the airport. Work-Live Such units may be seen as an intermediate step between working at home and using a separate small business unit. The business area may occupy 50% or more of total internal floor area, and be clearly separated from the residential element. The work space would include standards of noise insulation, ventilation, services and provision for equipment capable of accommodating a range of business uses which would not normally be acceptable in a home. See also Live-work. Worst mode noise contour On a long term average basis, aircraft operations at Heathrow are predominantly westerly, i.e. most of the time, aircraft land and take off towards the west. On a 20 year basis, some 77% of summer movements have been westerly, and 22% easterly. However, in any particular year, wind direction can be such that easterly operations can be a much higher proportion of total movements. A ‘worst mode’ noise contour might assume that operations were wholly easterly (e.g. typical easterly day), for certain planning purposes.
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