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FHWA Traffic Noise Model Version 3.0 - (2016 Draft Release Version Information)


Also available as Adobe PDF (1 MB)

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U.S. Department of Transportation

Federal Highway Administration

What is TNM 3.0?

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.

This image shows what the 3D view in TNM 3.0 will look like on a user's computer screen. It shows a roadway, building envelopes, and noise barriers. The objects are overlain on a real-world map of the area. Users can see the height of the roadway, buildings, and barriers to ensure that these objects' x, y, z coordinates were input as intended.
Figure 1: TNM 3.0 3D View on computer desktop.

New Features in TNM 3.0

Separation of the UI from the Acoustical formulas to simplify future updates
Acoustics User Interface
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
  Transparency toggles
This image shows what the plan view in TNM 3.0 will look like on a user's computer screen. It includes a defined polygon for a park, points for receivers, and line segments for the roadways, barriers, and building envelopes. Each item is denoted in a different color and overlain on a real world map of the area. Users can see how each item is spatially related to each other item and ensure that inputs were correct.
Figure 2: TNM 3.0 Plan View on computer desktop.

TNM 3.0 Draft Release

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.

Development Schedule

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
This image shows the splash screen that appears when TNM 3.0 is opened.
Figure 3: TNM 3.0 startup screen.
This image shows the blank basemap showing terrain, roadways, land and water features for the United States.
Figure 4: TNM 3.0 basemap.

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.

This image shows the full desktop view of TNM 3.0 including the top menu options, the main visualization screen where the user interacts with the project map area, and the data on that map surrounding the map area.
Figure 5: TNM 3.0 as it would appear on a typical desktop. This image shows the ‘Reports’ drop-down menu (top), ground zones input dialog box (bottom left), and calculated noise levels (bottom right).

Software Basis for TNM 3.0

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)  

Minimum System Requirements for TNM 3.0 Users

(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)

Minimum Software Requirements for Extension Users

(for software performance)

ArcGIS for Desktop 10.2

AutoCAD 2014

MicroStation V8 (SELECTseries 3)

This image shows the split screen functionality of TNM 3.0. A user will be able to see the plan view and 3D view of the project area simultaneously. In addition, the 3D view shows the line-of-sight analysis function. Users will now be able to see that function in action as denoted by the green lines radiating from the selected receiver point.
Figure 6: TNM 3.0 split screen functionality showing plan view (left) and 3D view with green line of sight visualization lines (right).
Updated: 5/17/2017
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