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Prepared for
U.S. Department of Transportation
Federal Highway Administration
Office of Environment and Planning
Washington, DC 20590
Prepared by
U.S. Department of Transportation
Research and Special Programs Administration
John A. Volpe National Transportation Systems Center
Environmental Measurement and Modeling Division, DTS-34
Cambridge, MA 02142-1093
In March 1998, the Federal Highway Administration (FHWA) Office of Natural Environment, released the FHWA Traffic Noise Model® (FHWA TNM®) Version 1.0, a state of the art computer program for highway traffic noise prediction and analysis. Since then, the FHWA, with assistance from the U.S. Department of Transportation's John A. Volpe National Transportation Systems Center (Volpe Center) and Foliage Software Systems (FSS), has released updates of TNM (Versions 1.0a, and 1.0b) in March 1999 and August 1999, respectively. In support of the FHWA and the California Department of Transportation, the Volpe Center and FSS released Version 1.1 in September 2000. Version 2.0 is the latest release of the TNM software. Two companion reports were released with TNM Version 1.0, a Technical Manual that describes the acoustics within TNM and a User's Guide.1,2 In addition, prior to TNM release, a data report was published that describes the vehicle noise emissions data base within TNM.3
The Version 2.0 User's Guide is an addendum to the FHWA TNM Version 1.0 User's Guide. It details the enhancements in the program up to and including Version 2.0.
Special thanks go to the TNM 2.0 beta test team. The staff at Bowlby and Associates, Inc., Harris Miller Miller and Hanson, Inc., and Environmental Acoustics, Inc. provided invaluable assistance and insight throughout this effort.
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