Field Evaluation of Reflected Noise from a Single Noise Barrier (2018) / Chapter Skim
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12 • The reference microphones were named BarRef01 for the microphone placed at the Barrier and NoBarRef02 for the microphone placed at the equivalent No-Barrier site. Measurements were made in terms of the equivalent sound level, Leq, for the broadband (overall)
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13 Statistical exceedance descriptors (Ln) -- specifically L1, L5, L10, L33, L50, L90 and L99 -- were computed for the 5-minute periods based on the 1-second data.
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14 Research Project (ATS Consulting 2005)
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15 events were examined for each site, and only those events that could be clearly identified at both the Barrier and No-Barrier sites were retained. Example vehicle pass-by events for each site are shown in this report.
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16 time differences, interaural intensity differences, and spectral changes that, in turn, create issues such as localization errors. In this study, statistical values of loudness were calculated to help account for the temporally varying sounds.
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17 Sound-Reflecting Barrier Study Locations Study Location Selection Criteria and Process Location selection criteria were developed in Phase 1 primarily to judge if a Barrier site and its potentially equivalent No-Barrier site are indeed equivalent. The criteria were incorporated in a Preliminary Site Evaluation Form prepared by the researchers.
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Location Roadway City, State Road Class Lanes Pavement Type Geometry Relative to Adjacent Land Uses AADT (vpd) Percent Trucks Barrier Location Barrier Material Barrier Height at Study Site BA-1 I-24 Murfreesboro, TN Freeway 8 DGAC At-Grade 78,140 14% ROW Precast Concrete 16–19 ft.
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