TNAG-1613-FCO40-2221-Executive-Council-of-Hong-Kong-memoranda-and-minutes-of-meet-1987 — Page 223

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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.