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Traffic Noise Model and Tools

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.

Technical Support

If you cannot find answers to your TNM questions from the resources below, you can contact TNM Tech Support at To expedite the process, please include your TNM version number (TNM 2.5 or TNM 3.0) in the email.

TNM Resources and Research

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 (TNM)

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Traffic Noise Model 3.2
Training and Webinars
TNM 2.5 to TNM 3.0 Conversion Tool
Traffic Noise Model 2.5

TNM Tools

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TNM Tools Fact Sheet (2022)
Traffic Noise Screening Tool
Sound Demo Tool

Consistency Test

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Consistency Test Suite
Updated: 1/9/2024
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