TNM 3.1 also enables the user to import existing TNM model files that include coordinate systems, projections, and adjustments.
For example, the Barrier Design Table now shows sound source contributions by barrier segment and offers the ability to filter and sort the data in the table. These changes were made in response to detailed user feedback regarding important functionality and data visibility required to conduct a highway traffic noise analysis on a typical project. TNM 3.1 also offers an improved user interface and data connections. The main window is a streetview map of the example project area.
USDOT.GOV NOISE MAPPING WINDOWS
This screenshot of the TNM 3.1 Graphical User Interface displays the various areas and windows available for the user to input and review data. The developers updated the data model for TNM 3.1 with improved error checking and error handling compared to TNM 3.0, so that version 3.1 can provide results for project models that would have errored out in TNM 3.0. TNM 3.1 corrects some minor acoustical calculation issues from TNM 3.0, although there have been no changes to the underlying acoustical assumptions or metrics since the last release. The updates should decrease the memory usage and runtimes of the software. TNM 3.1 now includes an installer, parallel processing of receivers, and removal of the database saving structure.
USDOT.GOV NOISE MAPPING SOFTWARE
The development focused on fixing software bugs and addressing feedback and feature requests from active TNM 3.0 users. FHWA released TNM 3.0 in February 2020 and will soon release the next version, TNM 3.1.įHWA worked closely with the Volpe National Transportation Systems Center to complete the version 3.1 update. The TNM line of software packages has been around for over two decades.
To assist with regulatory compliance related to noise impact determinations and noise abatement design, the Federal Highway Administration created the Traffic Noise Model (TNM) software.
Designing noise abatement requires understanding basic acoustic principles, regulatory requirements, public expectations, and some engineering considerations. To do so, a project team must first conduct a highway traffic noise analysis to determine whether noise impacts exist and to consider and design potential mitigation measures-noise abatement-to reduce those impacts. Highway traffic creates noise-and sometimes the negative impacts of noise in an area need to be mitigated or minimized.
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