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246 1.62.9 Limitations No specific limitations were given. 1.63 âQuiet Pavements: Lessons Learned from Europeâ. Focus. U.S. Department of Transportation. Federal Highway Administration. Washington, DC. April 2005. 1.63.1 General This paper outlines the findings of a scanning tour team (comprised of representatives of the FHWA, state transportation agencies, private industry, and academia) that visited Denmark, Netherlands, France, Italy, and the United Kingdom to report on these countries experience with quiet pavements. Please note that this article refers to other quiet pavement types besides porous asphalt. The tour team summarized that European countries were more comprehensive than the U.S. in addressing noise reduction. One of the three major noise reduction technologies being used in Europe was porous asphalt mixes. These are mainly used on rural roads and highways with moderate winter conditions. France has used single layer porous asphalt that has reduced noise by 6 to 9 dB as compared with a dense-graded pavement. Meanwhile, Italy has found that porous asphalt can achieve a life of 80-90 percent of a dense-graded mix. Other highlights from the tour team were: Quiet pavements in Europe cost 10 to 25 percent more than traditional pavements and federal regulations do not currently recognize quiet pavements as a noise mitigation strategy. 1.63.2 Benefits of Permeable Asphalt Mixtures No benefits of permeable asphalt mixtures were given. 1.63.3 Materials and Design No materials and designs were given. 1.63.4 Construction Practices No. construction practices were given. 1.63.5 Maintenance Practices No maintenance practices were given. 1.63.6 Rehabilitation Practices No rehabilitation practices were given. 1.63.7 Performance No performance guidelines were given.
