Field Evaluation of Reflected Noise from a Single Noise Barrier—Phase 1 (2016) / Chapter Skim
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99 C H A P T E R 5 Conclusions, Recommendations, and Suggested Research Conclusions The goal of this research was to investigate the potential change in the sound characteristics opposite a single, reflective highway noise barrier due to the reflection of the traffic noise off that barrier. It is concluded that the sound characteristics are indeed different.
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100 increased sound levels include frequencies that dominate highway traffic noise. These observations apply to vehicles traveling on either side of the road, for a range of distances from the road and heights above the road, and for the vehicle types examined (autos, heavy trucks, and motorcycles)
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101 5. The spectrograms will help in determining frequency ranges of sound reduction attributed to the absorption, as well as whether or not the absorption helps to reduce sustaining of the higher noise levels seen with a reflective barrier.
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102 Examination of Time-Above Metric In addition to examining other time-based metrics, it is suggested for future research to also examine time above. The Time-Above (TA)
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103 rule-of-thumb on when to further evaluate reflected noise and options to abate it (e.g., absorptive treatment on barrier)
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