To comply with 23 CFR, Part 772.17, TNM Version 2.5 (or any other model determined by the FHWA to be consistent with the methodology of the FHWA TNM) is required to be used on all Federal-aid highway projects. TNM 3.0 is allowed for use on projects at the discretion of the FHWA Division and State Department of Transportation.
If you cannot find answers to your TNM questions from the resources below, you can contact TNM Tech Support at TNMHelp@dot.gov. To expedite the process, please include your TNM version number (TNM 2.5 or TNM 3.0) in the email.
|Traffic Noise Model 2.5|
|TNM 2.5 to TNM 3.0 Conversion Tool|
|Traffic Noise Model 3.0 Updated: 2/11/2020|
|Low Volume Road Tool
The Low Volume Road Noise Calculation Tool provides a simple interface to use for calculation of bi-direction roadways. Please see the readme file for installation instructions.
|Software download (360MB ZIP)|