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Federal Highway Administration's Traffic Noise Model (FHWA TNM®), User's Guide (Version 2.5 Addendum)

Final Report April 2004

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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 and Human Environment, released the FHWA Traffic Noise Model (TNM), Version 1.0, a state-of-the-art computer model for highway traffic noise prediction and analysis. Since then, the FHWA, with assistance from the Volpe Center Acoustics Facility (Volpe Center) and Foliage Software Systems (FSS), have 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. Two additional updates were released: TNM 2.0 in May 2002 and TNM 2.1 in March 2003. TNM 2.5 is the latest version of TNM.

Two companion reports were released with TNM Version 1.0: a Technical Manual that describes the acoustics within TNM and a User's Guide (References 1, 2). In addition, prior to TNM release, a data report was published that describes the vehicle noise-emissions database within TNM (Reference 3). This document 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 2.5.

Overview of TNM: TNM computes highway traffic noise at nearby receivers and aids in the design of highway noise barriers. As sources of noise, it includes 1994-1995 noise emission levels for the following cruise-throttle vehicle types:


Special thanks go to the TNM 2.5 beta test team. The staff at Bowlby and Associates, Inc., Harris Miller Miller and Hanson, Inc., and Environmental Acoustics, Inc. provided invaluable assistance during development of TNM 2.5.

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Updated: 10/19/2015
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