Field Evaluation of Reflected Noise from a Single Noise Barrier—Phase 1 (2016) / Chapter Skim
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15 C H A P T E R 3 Study Locations Study Location Selection Criteria and Process Location selection criteria were developed 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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16 The originally selected California location was ATS-2, SR-99 in Bakersfield, CA. Before the measurements could be conducted, a roadway construction project was started at the ATS-2 location.
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17 Most of the measurement points were within the highway right-of way, meaning that most of the distances to the community microphones were within approximately 100 ft of the center of the near travel lane. The exception was the SR-71 site where the more distant microphones were able to be set up approximately 400 ft from the center of the near travel lane.
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18 Table 3. Acceptable candidate locations.
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19 I-24, Murfreesboro, TN (Location BA-1) I-24 is an 8-lane freeway with dense-graded asphalt pavement that carries 78,000 vehicles per day with 14% trucks.
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20 Figure 5 shows cross-sections at the Barrier and No Barrier sites. Figure 6 shows photographs of each site.
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21 Figure 5. Cross-sections at the I-24 Barrier (top)
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22 Figure 6. I-24 BarRef01 (top left)
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23 Briley Parkway (SR-155) , Nashville, TN (Location BA-3)
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24 The Briley Parkway ("Briley") noise measurements and traffic speed measurements began at 17:04 on August 14 and ended at 21:04.
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25 Figure 9. Cross-sections at the Briley Parkway Barrier (top)
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26 Figure 10. Briley BarRef01 (top left and right)
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27 I-90, Rockford, IL (Location SID-1) I-90 is part of the Illinois Tollway system and is a six-lane freeway with dense-graded asphalt pavement.
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28 Figure 12. I-90 microphone positions.
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29 Figure 13. Cross-sections at the I-90 Barrier (top)
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30 Figure 14. I-90 BarRef01 (top left)
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31 SR-71, Chino Hills, CA (Location ATS-3) SR-71 is a six-lane freeway in Chino Hills, CA, with longitudinally grooved concrete pavement.
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32 microphone, the ground between the highway noise source and BarCom03 would have included more pavement than for NoBarCom05 due to a merge lane; the close microphones were shifted south of where the merge lane ends)
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33 Figure 17. Cross-sections at the SR-71 Barrier (top)
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34 Figure 18. SR-71 BarRef01 (top left)
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35 Figure 19. SR-71 BarRef01 Traffic speed (top left)
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36 Figure 20. No Barrier NoBarCom05 and NoBarCom06 (left)
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37 Figure 21. MD-5 microphone positions.
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38 Figure 22. Cross-sections at the MD-5 Barrier (top)
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39 Figure 23. MD-5 BarRef01 (top left)
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40 Summary of Microphone Positions For reference, Table 9 summarizes the microphone heights and distances from the road at each location. Table 9.
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