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.
The FHWA, States, and others have conducted much research that is broadly applicable to the use the Traffic Noise Model. For information and research products please visit the Resources and Research Homepage.
|Traffic Noise Model 3.2
|Training and Webinars
|TNM 2.5 to TNM 3.0 Conversion Tool
|Traffic Noise Model 2.5
|TNM Tools Fact Sheet (2022)
|Traffic Noise Screening Tool
|Sound Demo Tool
|Consistency Test Suite