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104 R E F E R E N C E S 1. FHWA. âSummary of Noise Barriers Constructed by December 31, 2010,â FHWA-HEP-12-044, July 2012. 2. Menge, C. W. and D. E. Barrett. âReflections from Highway Noise Barriers and the Use of Absorptive Materials in the United States, Why Small Increases in Noise Levels may Deserve Serious Consideration,â Transportation Research Record: Journal of the Transportation Research Board, No. 2233, Transportation Research Board of the National Academies, Washington, D.C., 2011, p. 161. 3. C. S. Y. Lee and G. G. Fleming. Measurement of Highway-Related Noise, USDOT Volpe Center Acoustics Facility, FHWA-PD-96-046 May 1996. This document is on-line at: http://www.fhwa.dot.gov/environment/noise/measure/index.htm. 4. ATS Consulting. Evaluation of Atmospheric Effects Associated with Highway Noise Propagation, Arizona Transportation Research Center SPR 555 2005.