TNM significantly underestimates, and overlooks, the noise attenuation of 6’-8’ tall solid safety barriers (SSBs) because TNM distributes a large amount of noise energy tall in the vehicle profiles at…
The Observations leading to this proposal are 1) that a fibrous material (such as a long-bladed grassy bush or the fur of an animal) can noticeably reduce sound levels from…
FHWA regulations for highway traffic noise (23 CFR 772) outline procedures for traffic noise analysis and noise abatement requirements for State DOT highway projects. The regulations stipulate that noise abatement…
This research effort will provide a compendium of DOTs Alternative Project Delivery processes as they relate to noise abatement. Several approaches will be undertaken to compile the compendium: • A…
Field test and model 12-15 low berms along different roadways and document the results. Compare the measured to the modeled results. Compare the results to typical structural noise barrier results.…
TERI Administrator Note (Feb 2009) – Research Complete – Related research: The FHWA Roadway Construction Noise Model (FHWA RCNM) Version 1.0 is a Windows-based program that is available without cost…
TERI Administrator Note (May 2013): Completed July 2012 as NCHRP 10-76 Methodologies for Evaluating Pavement Strategies and Barriers for Noise Mitigation Although efforts to reduce transportation-related noise are costly , the…
Develop improvements to the FHWA TNM and traffic noise-analysis techniques to address the following: 1) Effects of Irregular Terrain – Highway sites may include terrain with undulations of varying size,…
Since the release of the FHWA Traffic Noise Model (TNM), users have identified additional factors that affect highway traffic noise prediction. Improvement of the model’s acoustical capabilities will allow a…
TERI Database Administrator Notes: Not recommended at present time by 2009 Environmental Process Subcommittee. Develop and distribute a brochure or otehr publication that describes improved, more cost-effective and aesthetically pleasing…