Overview and application of the Continuous-Flow Traffic Time-Integrated Method (CTIM) for determining the influence of road surfaces on traffic noise
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Overview and application of the Continuous-Flow Traffic Time-Integrated Method (CTIM) for determining the influence of road surfaces on traffic noise

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      NTL-HIGHWAY/ROAD TRANSPORTATION-Pavement Management and Performance ; AGR-IMPACTS-Environment ; NTL-ENERGY AND ENVIRONMENT-Environment Impacts ;
    • Abstract:
      The U.S. Department of Transportation Federal Highway Administration is sponsoring a Technical Working Group (TWG) to develop guidance for measuring the influence of road surfaces on tire-pavement noise, vehicle noise, and traffic noise in the U.S. This paper reviews provisional specification AASHTO TP 99-11, “Determining the Influence of Road Surfaces on Traffic Noise Using the Continuous-Flow Traffic Time-Integrated Method (CTIM)” and example applications. CTIM is a wayside measurement method which is applied to roadways where measuring single vehicle pass-by events would be difficult due to continuously flowing, relatively dense traffic. At a specified distance from the nearest travel lane, measurements capture sound from existing traffic for all vehicles on all roadway lanes (equivalent sound levels with a maximum sampling period of 15 minutes). A traffic noise prediction model is used to normalize sound levels in terms of traffic variation in order to compare data taken at different times. The method currently allows for comparison of varying or aging pavement surfaces on a single roadway; extension of the normalization process to include site variations to allow for site-to-site comparisons is being examined.
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