According to EPD guidelines, the primary function of a noise barrier is to eliminate excessive noise generated by vehicles. Noise barriers are considered the most reasonable and effective noise mitigation measures. There are many factors to consider when designing a sound barrier. These are acoustic design considerations, transmission loss of various barrier materials, noise barrier performance due to holes, slots or gaps, barrier shape, material selection, noise barrier materials barrier, earth berms and retaining structures and non-acoustic considerations. This report first presents the eight considerations listed above and gives the case study of a noise barrier in Hong Kong to make an analysis whether it is excellent or not. Acoustic Design ConsiderationsAcoustical performance is related to the material, location, dimensions and shape of the noise. barrier. Normally, road traffic noise is mainly reflected by the noise wall towards the source and part of the noise is absorbed by the wall or diffracted at the upper edge of the wall. Noise diffraction mainly depends on the location, shape and dimensions of the barriers. The bottom of the absorbent materials should be at least two to three meters long. This ensures that the materials will absorb most of the sound energy. Transmission Loss of Various Barrier Materials It is recognized that all materials allow sound energy to pass through, it depends on the material and the frequency of the sound. “Transmission loss” is the attenuation of the passage of sound. through a material. For acoustic purposes, materials used as a barrier between the noise source and the noise receptor provided that they have a TL of at least 10 dB greater than the desired noise reduction. It ensures that the only pleasant way to consider in acoustics...... middle of paper ......ge towards the ecosystem and the environment as shown by the phenomenon in case II. Indeed, Case II is a rupture design. (HKBWS Magazine) To summarize, compared to Case I and Case II, the choice of material is an important element for design consideration. It is necessary to understand the geographical conditions and make the right choice of materials. For case II, non-transparent materials should be used, such as concrete, to reduce the risk of birds colliding with the barrier. In the future, the government can take Case I as a model for noise barrier design. In case I can build it myself with natural grass growth, it's environmentally friendly. Last but not least, it is necessary to build on the eight design considerations of the EPD guidelines. Works Cited http://www.epd.gov.hk/epd/english/environmentinhk/noise/guide_ref/design_barriers_content2.html