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Edition:June 2017–June 2019
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Abstract:The Texas Department of Transportation commissioned a study to analyze the feasibility and effectiveness of lightweight noise barriers on Interstate Highway (IH) 30, near downtown Dallas in 2013. The study led to the installation of two adjacent transparent highway noise barriers in 2013 and 2018, respectively. The success of that project led to the possibility of similar installations at other locations in the Dallas District. The President George Bush Turnpike (main lanes), and the State Highway (SH) 190 (frontage roads), in Rowlett, near Lake Ray Hubbard, represent a similar noise problem for the residential sites along the highway, with existing noise walls that were apparently insufficient to attenuate the traffic noise. Based on the experience obtained at the IH-30 site, it was decided to perform a similar study for the turnpike and SH 190. The first stages of this study are the subject of this preliminary report. The activities included the site selection for residential noise monitoring, investigating the pavement characteristics related to noise generation, and the computer modeling of the highway noise and the acoustic design of noise walls considering the geometry of the road, its profile, traffic and the existing noise walls. Residential sound pressure level tests were performed at various residential locations for several months. A portable weather station was used to monitor the conditions at the time of the tests. Measurements were conducted throughout the day—morning, afternoon, and evening—and test days occurred once a month. At the time this report is being prepared, the existing noise walls are being retrofitted with transparent panels to increase their height and provide noise reductions. Noise tests to monitor the post-installation wall’s performance will ensue, following similar procedures as those of the first phase.
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