A study on the performance of road traffic noise control measures

Pao Yue-kong Library Electronic Theses Database

A study on the performance of road traffic noise control measures


Author: Cheng, Kam-wing
Title: A study on the performance of road traffic noise control measures
Degree: M.Sc.
Year: 1997
Subject: Traffic noise -- China -- Hong Kong -- Case studies
Noise control -- China -- Hong Kong -- Case studies
Acoustical engineering -- China -- Hong Kong -- Case studies
Traffic noise -- China -- Hong Kong -- Measurement -- Case studies
Hong Kong Polytechnic University -- Dissertations
Department: Dept. of Civil and Structural Engineering
Pages: vii, 107, [3] leaves : ill. ; 30 cm
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b1420182
URI: http://theses.lib.polyu.edu.hk/handle/200/2488
Abstract: Road traffic noise problem is on the verge of approaching tightening control in Hong Kong. Past efforts have been exercised rather upon a passive steps to tackle the problem. Application of engineering control measures is currently at most restricted to some new infrastructural development or road network improvement schemes. Existing interface problems are only touched upon some major change in noise exposure as result of new or modified road network schemes. A wealth of experience has been accumulated on the application of such engineering control measures but some drawbacks or deficiency persist. The study aims at giving a technical overview of the performance of 2 engineering control measures for controlling road traffic noise. A number of 3 studies including 2 noise surveys and I social response survey on road resurfacing and noise barrier have been devised. In Noise Survey Study I noise reduction upon the application of road resurfacing is determined. Results do not reveal any significant noise reduction but rather than the occurrence of spectral shift. Noise masking effect and the effect of ageing and clogging are suggested to be the main causes for zero noise reduction. An estimate of the maximum spectral noise reduction attributable to road resurfacing features a maximum of 5 dB(A) reduction given from those light and high speed vehicles. Noise barrier is studied in Noise Survey Study II from which the insertion losses determined at the shadow and illuminated zone are quite insignificant. Lateral noise intrusion at the end of the barrier and poor on-site noise insulation performance are suggested to account for this inadequacy. Ways for remedy using the return wall design are recommended to remove lateral noise intrusion. The Social Response Study is to gather those views from the protected dwellings on the performance of both road resurfacing and noise barrier commissioned on the study site. Most of the respondents indicate only negligible improvement from the control measures. The factor of proximity to the source is shown to be highly important that the psychological benefit offered by the noise barrier has been denied. Sleep disturbance deems to receive the most concern among other effects on human activities. Noise reduction is ranked the most important factors in the selection of control measures. Noise insulation is therefore the most preferred option. The relative importance of all those considerations in the questionnaires should be identified so as a more objective evaluation on the performance of the control measures can be obtained. Statistical techniques such as factor analysis are recommended.

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