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2.2.2
Type of area within which the Noise Sensitive Receiver (NSR) is
located
whereas in
The Authority shall have regard to an area of adequate size when determining the type of area within which the NSR is
is located in
accordance with the descriptions in Table 1. Typically, in urban areas
an area of 100 m radius around the NSR should be adequate,
sparsely developed areas, such as rural districts, an area of 500 m
more should be considered, depending upon the
Special factors may dictate that other distances should
radius or
even
circumstances.
be used at the discretion of the Authority.
2.2.3
Effect of Influencing Factors (IFs)
For the purpose of this Technical Memorandum any industrial
area, major road or the area within the boundary of Hong Kong
International Airport shall be considered to be an IF. Industrial areas
and the Airport should be regarded as IFS irrespective of the time of
day.
The term "industrial area" means an area which consists of a
significant number of factories or industrial undertakings located
primarily in purpose-built industrial buildings. The term "major road"
means a road which has a heavy and generally continuous flow of vehicular traffic and, in normal circumstances, means a road with an annual average
daily traffic flow in excess of 30,000. Where a major road has an unusually low traffic flow rate (less than 300 vehicles per hour) at the
time of day under consideration it shall not be considered as an IF at
that time.
In situations where more than one IF affects the NSR to an
equal degree only one IF shall be considerd.
2.2.4
Area Sensitivity Ration (ASR)
The Authority shall determine the appropriate ASR for the NSR
under consideration from Table 1.