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U.S. Department of Transportation
Federal Highway Administration
The Federal Highway Administration’s (FHWA) Traffic Noise Model (TNM) is a software application for the modeling of highway traffic noise. FHWA’s TNM 3.0 ® is the latest version of this software. State and local entities seeking to use Federal Aid Highway Program (FAHP) funding, must use the TNM to analyze potential noise impacts from their proposed project.
TNM 3.0 is a major update to the previous version – TNM 2.5. The TNM 2.5 was released in 2004 and no longer meets modern standards of interface design or software maintenance. TNM 3.0 incorporates new technology and research; and accounts for input received from TNM 2.5 users over the past 12 years.
|Bug fixes to acoustical algorithms found in TNM 2.5||Graphics and Map-based User Interface (UI)|
|Removal of TNM 2.5’s interpolation below 250 Hz and extrapolation above 5000 Hz||3D views through a stand-alone GIS desktop application|
|Calculations for all 1/3 octave bands||Parallel barrier analysis tool integration|
|Calculation of single barrier reflection values||Enhanced line of sight analysis|
|Creation of a Roadway Acoustic Impedance Hierarchy in cases of overlapping roadways||Ability to dock floating windows and have a split screen|
|Ability to add flow control devices at any point of a roadway without needing to create a new roadway segment||Ability to process Geographic Information Systems (GIS) and Computer-aided Design (CAD) files|
|Updates to the ability to calculate Ldn and Lden||Simplified ‘hide or show’ features functionality|
|Addition of the L10 and L50 noise descriptors||Multilane creation tool|
|Updated free-field divergence that accounts for the horizontal and vertical components||Help Menu embedded within TNM 3.0|
|Enhanced edit menu|
|Updated printing and saving|
The current release is a Final Draft version of TNM 3.0. It will be available for download and use for 6 months. Users will be able to provide comments and ask questions during this period. FHWA will consider the input received prior to releasing the Final version of TNM 3.0 for required use on projects.
For status updates please see:
Or contact us through TNMComments@dot.gov
|January-February 2017||Draft Release of TNM 3.0|
|July-August 2017||End 6-month comment period|
|Fall 2017||FHWA consideration of comments and questions|
|Winter 2017||Update TNM 3.0 if necessary|
|Spring-Summer 2018||Final release of TNM 3.0 and associated 23 CFR 772 updates|
Interoperability with ArcGIS, AutoCAD, and MicroStation
TNM 3.0 is also accessible as an extension to Esri’s ArcGIS ®, AutoDesk’s AutoCAD ®, and Bentley’s MicroStation ®.
Complex highway design and alignment work can be completed in CAD and GIS environments using native tools, while allowing the design team to test their work with the underlying, integrated noise model.
Engineers will be able to present roadway projects, including the noise abatement plans, to the public more easily using the new interfaces.
|Esri ArcGIS Runtime||GeoAPI||C#|
|Microsoft .NET Framework||C5||PowerCollections|
|Cesium Viewer/WebGL 3-D||Tortoise HG||NUnit|
|Microsoft Visual Studio 2010 with .NET 4.0||Mercurial(HG)|
(for optimal software performance)
|OS||Windows 7 or higher (not compatible with Mac OS)|
|Graphics Card||Intel® HD Graphics (or equivalent)|
|ROM||20 GB or more of free space available for working (2 GB minimum for install)|
|CPU||Intel® Core i5 or i7 (or equivalent CPU)|
(for software performance)
ArcGIS for Desktop 10.2
MicroStation V8 (SELECTseries 3)