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157 A p p e n d i x i Summary of Field Measurement Results ADS ADS Type Airport Type Ave. STI Median Ceiling Height Day ANN LASmax Day Ambient Leq Night Ambient Leq SNR-Test RT60 Average at 2,000 Hz 1 Concourse Major hub 0.33 35.8 75 66 61 9.6 3.4 2 Ticketing Major hub 0.49 19.0 73 62 52 17.6 0.9 3 TSA Major hub 0.61 24.6 75 64.5 51 17.3 1.0 4 Food court Major hub 0.65 33.5 77 62 52 21.9 1.1 5 Gates Major hub 0.68 11.5 71 57 52 11.4 0.9 6 Ticketing Major hub 0.46 75.0 73 64.5 55 11.0 2.7 6.5 Food court Major hub 0.41 18.8 75 71 57 11.7 N/A 7 Concourse Major hub 0.46 13.8 74 62 60 10.5 1.5 8 Gates Major hub 0.36 36.8 76 66.5 58 14.6 3.5 9 Concourse Major hub 0.45 15.3 72 62 57 9.3 0.9 10 Gates Major hub 0.47 13.0 72 60 54 9.4 1.1 11 Food court Major hub 0.36 62.0 67 65 56 12.1 3.0 12 Concourse Major hub 0.52 18.3 67 62 52 16.3 1.3 13 Concourse Major hub 0.55 19.0 70 61.5 52 15.6 N/A 14 Gates Major hub 0.50 14.0 72 60 61 7.7 N/A 15 Gates Major hub 0.58 14.0 72 60 53 13.7 1.3 16 Ticketing Major hub 0.61 24.0 69 63 51 20.9 1.0 17 Arrivals Major hub 0.46 68.0 68.5 61 56.5 7.3 2.3 18 Baggage Major hub 0.73 19.0 69 61 47 20.0 0.9 19 Baggage Major hub 0.63 19.0 65 62.5 51 15.4 0.9 20 Gates Major hub 0.65 11.0 73 65 58 11.3 1.0 21 Concourse Major hub 0.49 59.0 76 64 59 11.5 2.9 22 Ticketing Major hub 0.52 39.5 72 66 55 8.3 2.9 23 Baggage Major hub 0.48 18.8 64 61 54 12.8 1.5 24 Gates Major hub 0.62 11.6 79 62 57 13.9 0.7 25 Gates Major hub 0.65 11.0 77 61 56 17.3 1.0 26 Concourse Major hub 0.64 10.7 76 65 57 15.2 0.8 27 Baggage Regional 0.50 8.1 70 53 51 6.8 0.6 28 Arrivals Regional 0.49 21.3 66 51 47 16.0 1.6 29 Ticketing Regional 0.59 8.0 71 56 52 12.0 1.0 30 TSA Regional 0.46 27.5 69 59 51 11.0 1.2 Table I-1. Summary of field measurement locations and key information. (continued on next page)
158 improving intelligibility of Airport Terminal public Address Systems Table I-2. Average octave band spectra for measured ambient conditions. Ambient Condition 63 125 250 500 1000 2000 4000 8000 Daytimeâall ADS 62.4 60.5 59.1 59.4 56.2 52.9 47.0 39.5 Nighttimeâall ADS 59.5 57.2 54.3 52.3 49.1 45.6 40.1 32.0 Daytimeânoisy (65 dBA) 64.7 64.1 63.5 63.7 60.0 57.2 51.9 44.2 Daytimeâquiet (59 dBA) 61.3 58.6 56.7 57.1 54.2 50.6 44.4 37.0 Nighttimeânoisy (59 dBA) 62.4 60.8 58.2 57.0 54.5 51.4 45.4 37.5 Nighttimeâquiet (51 dBA) 58.0 55.2 52.0 49.4 45.7 41.9 36.6 28.9 ADS: Acoustically distinguishable space Table I-1. (Continued). ADS ADS Type Airport Type Ave. STI Median Ceiling Height Day ANN LASmax Day Ambient Leq Night Ambient Leq SNR-Test RT60 Average at 2,000 Hz 31 Gates Regional 0.51 8.4 67 56 50 10.0 0.9 32 Gates Regional 0.47 26.5 67 54 47 15.5 1.6 33 Curbside Regional 0.61 8.0 N/A N/A N/A N/A N/A 34 Baggage Medium hub 0.5 16.4 76 66 63 11.0 1.3 35 TSA Medium hub 0.45 36.6 72 68 56 10.5 2.1 36 Ticketing Medium hub 0.44 36.3 74 68 60 7.0 1.5 37 Baggage Medium hub 0.41 20.9 69 54 54 17.0 2.4 38 Baggage Medium hub 0.32 10.0 73 62 62 11.0 2.8 39 Ticketing Medium hub 0.57 10.0 70 60 57 15.0 0.6 40 Food court Major hub 0.56 24.4 72 68 63.3 14.2 1.5 41 Gates Major hub 0.59 13.8 73.5 59 50 20.0 1.1 42 Ticketing Major hub 0.36 30.0 75 65 66 6.0 2.5 43 Curbside Major hub 0.39 28.3 70 71 64 2.0 N/A 44 Baggage Major hub 0.52 23.4 73 53 46 26.0 1.6 45 Baggage Major hub 0.61 11.3 75.5 71 59 15.0 1.3 Average 0.51 23.6 72 62 55 13 1.6 Median 0.50 19.0 72 62 55 12 1.3 ADS: Acoustically distinguishable space ANN: Announcement N/A: Not available
Abbreviations and acronyms used without definitions in TRB publications: A4A Airlines for America AAAE American Association of Airport Executives AASHO American Association of State Highway Officials AASHTO American Association of State Highway and Transportation Officials ACIâNA Airports Council InternationalâNorth America ACRP Airport Cooperative Research Program ADA Americans with Disabilities Act APTA American Public Transportation Association ASCE American Society of Civil Engineers ASME American Society of Mechanical Engineers ASTM American Society for Testing and Materials ATA American Trucking Associations CTAA Community Transportation Association of America CTBSSP Commercial Truck and Bus Safety Synthesis Program DHS Department of Homeland Security DOE Department of Energy EPA Environmental Protection Agency FAA Federal Aviation Administration FAST Fixing Americaâs Surface Transportation Act (2015) FHWA Federal Highway Administration FMCSA Federal Motor Carrier Safety Administration FRA Federal Railroad Administration FTA Federal Transit Administration HMCRP Hazardous Materials Cooperative Research Program IEEE Institute of Electrical and Electronics Engineers ISTEA Intermodal Surface Transportation Efficiency Act of 1991 ITE Institute of Transportation Engineers MAP-21 Moving Ahead for Progress in the 21st Century Act (2012) NASA National Aeronautics and Space Administration NASAO National Association of State Aviation Officials NCFRP National Cooperative Freight Research Program NCHRP National Cooperative Highway Research Program NHTSA National Highway Traffic Safety Administration NTSB National Transportation Safety Board PHMSA Pipeline and Hazardous Materials Safety Administration RITA Research and Innovative Technology Administration SAE Society of Automotive Engineers SAFETEA-LU Safe, Accountable, Flexible, Efficient Transportation Equity Act: A Legacy for Users (2005) TCRP Transit Cooperative Research Program TDC Transit Development Corporation TEA-21 Transportation Equity Act for the 21st Century (1998) TRB Transportation Research Board TSA Transportation Security Administration U.S.DOT United States Department of Transportation
TRA N SPO RTATIO N RESEA RCH BO A RD 500 Fifth Street, N W W ashington, D C 20001 A D D RESS SERV ICE REQ U ESTED N O N -PR O FIT O R G . U .S. PO STA G E PA ID C O LU M B IA , M D PER M IT N O . 88 Im proving Intelligibility of A irport Term inal Public A ddress System s A CRP Research Report 175 TRB ISBN 978-0-309-44643-3 9 7 8 0 3 0 9 4 4 6 4 3 3 9 0 0 0 0
