Field Evaluation of Reflected Noise from a Single Noise Barrier (2018) / Chapter Skim
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19 to conduct extended monitoring at the EA-5 location, with the goal of nighttime or off-peak sampling that would allow individual vehicle pass-bys to be studied. Thus, locations SID-1, ATS-3, and EA-5 were studied in Task 5.
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20 Mic.
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21 Figure 5. I-24 -- cross-sections at Barrier site (top)
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22 Source: Research team, NCHRP Project 25-44 Figure 6. I-24 -- BarRef01 (top left)
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23 Source: Research team, NCHRP Project 25-44 Figure 7. SR-155 (Briley Parkway)
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24 Mic.
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25 Source: Research team, NCHRP Project 25-44 Figure 10. SR-155 (Briley Parkway)
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26 temperatures in the low 80° F range, dropping into the low 70° F range after dark. Winds were calm throughout the measurement period.
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27 radar gun were located on the overpass between the Barrier and No-Barrier sites. Figure 13 shows cross-sections at the Barrier and No-Barrier sites.
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28 Figure 13. I-90 -- cross-sections at the Barrier site (top)
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29 Source: Research team, NCHRP Project 25-44 Figure 14. I-90 -- BarRef01 (top left)
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30 Source: Research team, NCHRP Project 25-44 Figure 15. SR-71 -- No-Barrier NoBarCom05 view (left)
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31 Source: Satellite image © 2015 Google Earth Figure 16. SR-71 -- microphone positions.
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32 Figure 17. SR-71 -- cross-sections at Barrier site (top)
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33 Source: Research team, NCHRP Project 25-44 Figure 18. SR-71 -- BarRef01 (top left)
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34 Source: Research team, NCHRP Project 25-44 Figure 19. SR-71 -- BarRef01 traffic speed (top left)
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35 Source: Research team, NCHRP Project 25-44 Figure 20. MD-5 -- No-Barrier NoBarCom05 and NoBarCom06 view (left)
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36 Source: Satellite image © 2015 Google Earth Figure 21. MD-5 -- microphone positions.
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37 Figure 22. MD-5 -- cross-sections at Barrier site (top)
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38 Source: Research team, NCHRP Project 25-44 Figure 23. MD-5 -- BarRef01 (top left)
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39 Microphone Name Distance (ft.) I-24 SR-155 (Briley Pkwy.)
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40 Sound-Absorbing Barrier Study Locations Selected Locations The Phase 1 location selection criteria were used for Phase 2. These criteria were used to judge if a Barrier site and its potentially equivalent No-Barrier site are indeed equivalent.
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41 Location Roadway City, State Road Class Lanes Pavement Type Geometry Relative to Adjacent Land Uses AADT (vpd) and Year Percent Trucks Barrier Location Barrier Material Barrier Height at Study Site (ft.)
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