The Mayor's Ambient Noise Strategy - Greater London Authority

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The Mayor’s Ambient Noise Strategy Mayor of London 253 Event level the ‘Guide to health, safety and welfare at pop concerts and similar events’ Health and Safety Executive/Home Office, 1999 advises that audience sound level exposure should be restricted to below an equivalent continuous level over the event as a whole (Event L eq ) of 107 dB(A). Exposure in terms of peak sound pressure level should not exceed 140 dB. Façade level a sound pressure level at a position typically between 1 and 2m from a sound reflecting surface, such as the façade of a building, typically assumed to be 3 dB(A) higher than a free field level (see below), unless a more accurate figure is available. Flanking transmission Sound transmitted between rooms via building elements common to both of them, such as a supporting wall, rather than the element separating them, such as a floor. Free field level a sound pressure level unaffected by reflection from any surfaces other than the ground, typically taken to be at least 3.5m from any sound reflecting object. Frequency number of oscillations in pressure of a sound wave, about the ambient static air pressure. Usually measured using Hertz. Frequency band a continuous range of frequencies between specified upper and lower limits. Functional bodies the Mayor has responsibility for appointing members to, and setting budgets for, four new organisations: Transport for London (Tfl), London Development Agency (LDA), London Fire and Emergency Planning Authority (LFEPA), Metropolitan Police Authority (MPA). The term ‘GLA family’ or ‘GLA group’ includes the Greater London Authority, which is the core organisation serving the Mayor and the London Assembly. Glide path or glideslope Part of the Instrument Landing System (ILS). This includes the localiser signal, which provides guidance to aircraft in the horizontal plane, and the glide path (or glidelope) which supplies vertical guidance. Pilots manoeuvre under the instruction of air traffic control to intercept the localiser beam, and descend on the glideslope to land. The glideslope at Heathrow and other major airports is 3 degrees from the horizontal. During the day, aircraft are required to join the glidepath at or above 2,500 feet. On a 3 degree slope, this is about 8.5 miles (13.5 kilometres) from touchdown, although they may join further out. There are no fixed routes for landing aircraft before they join the glide path. At night, aircraft are required to join the glide path at or above 3,000 feet.
254 Mayor of London The Mayor’s Ambient Noise Strategy GLA group or GLA family see Functional bodies. Green Chains linked, but separate, open spaces forming strategic walking or cycling routes. Some overlap with ‘Green Corridors’. Green Corridors relatively continuous areas of open space leading through the built environment, which may link sites to each other and to the Green Belt or Metropolitan Open Land. They often consist of railway embankments and cuttings, roadside verges, canals, parks, playing fields and rivers. They may allow animals and plants to be found further into the built-up area than would otherwise be the case and provide an extension to the habitats of the sites they join. Some overlap with ‘Green Chains’. Green Wave Co-ordination of the timing of a sequence of traffic signals so that a vehicle driven at a certain steady speed can encounter signals successively at green, rather than having to stop repeatedly. This is more difficult to achieve in a congested city with many conflicting movements than, for example, in a town with a simple radial road network. Groundborne vibration see Vibration. Hard ground An acoustically reflecting surface, such as concrete, most other paving materials, and water. Contrasts with ‘soft ground’. Hertz or Hz Measure of sound frequency, sometimes referred to as cycles per second. Home working Working at home. This should be acceptable in most housing situations provided the business use does not generate noise or vibration from equipment, visitors, traffic or other activities which exceed levels which could reasonably be expected from housing use alone. Home workers would be advised to seek a determination in writing from their local planning authority as to whether or not planning permission is needed. Home Zones Residential streets designed and managed to allow people to share former carriageways and pavements. Vehicles should only be able to travel a little faster than walking pace (less than 10mph). This means that the street can be modified to include children’s play areas, larger gardens or planting such as street trees, cycle parking and facilities such as seats at which residents can meet. Home Zones should therefore make residential areas safer for pedestrians and cyclists, and improve the quality of the street environment.
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