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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
TERI Administrator Note (Feb 2009): Related Research: Highway Construction Noise Handbook (Volpe Center, 2006) Develop a comprehensive, multi-modal transportation noise prediction methodology, in cooperation with other transportation modes.
TERI Administrator Note (January 2009): Funded as NCHRP Project 25-25, Task 40. Completed January 2008. http://www.trb.org/TRBNet/ProjectDisplay.asp?ProjectID=1658 Background: The cost and total quantity of noise barriers as an environmental abatement
TERI Administrator Note (Added December 2008) – Project sponsored by Ohio DOT is underway (see details below) Develop a turn-key, wireless, low cost sensor system for autonomous monitoring, measuring, and
I. Research Problem Statement – Concerns about pavement noise continue to be expressed in many urban areas in the United States. Comprehensive studies have been completed in Europe resulting in
The size of DNL 65 dB noise contours around the nation’s airports has diminished steadily for the past three decades; and now most noise complaints come from persons residing outside
TERI Database Administrator Notes: Not recommended at present time by 2009 Environmental Process Subcommittee. Vehicles striking rumble strips can elevate wayside noise levels and generate noise complaints in noise sensitive
Problem Statement – Studies by several research groups have shown that the atmospheric refraction and scattering effects that occur on the sound wave propagating from a highway traffic source is
Problem Statement – Land adjacent to airports, highways, and rail transit lines needs to be developed so that noise sensitive uses are prohibited and community development is planned, designed, and
a) Extend what is known about masking effectiveness of traffic noise on the vocalizations of birds by conducting behavioral tests with a wider range of individual and species. It should
Problem Statement Residents on the opposite side of a highway from a reflective noise barrier often complain that construction of the barrier has increased noise levels in their area. The
Among the many types of on-road vehicles traveling the American highway system, heavy trucks are the loudest frequently-heard noise sources. Comments from residents near highways at project public hearings and
Tire-pavement noise has become an important consideration for highway agencies, as the public increasingly demands that highway traffic noise be mitigated. Title 23, Part 772 of the Code of Federal
PROBLEM STATEMENT: It has been the experience of a number of state transportation departments, that there is a strong potential for residents on the opposite side of a highway from
RESEARCH PROBLEM STATEMENT Paying a contractor based on the quality of pavement construction is not new. In fact, nearly all specifications accomplish this, be it through means & methods, end-result,
Problem Statement Although current and historical efforts to reduce transportation-related noise have been costly to develop, implement, and enforce, the nature and magnitude of their specific costs have not been
Problem Statement Current transportation noise policies in the United States rely heavily on scientific dose-response relationships between noise-exposure levels and various community responses, predominantly “community annoyance.” This is also the
Problem Statement Transit vehicular warning horns are relatively omni-directional and can be a source of annoyance in areas of the community adjacent to rail lines. For example, train horns sounded
Problem Statement On a national scale, increased emphasis is being placed on expansion and refurbishment of fixed-guideway transit systems, especially steel rail-steel wheel formats. This has exacerbated the need for
Problem Statement Vibration propagation through the ground is physically very similar to the propagation of noise through the air. Vibration and noise are similar in other respects as well; however,
Problem Statement The specific noise issue in the vicinity of at-grade rail crossings is locomotive warning horn and crossing bell sounds, which cause significant noise impacts. The acoustic signatures of
Problem Statement The operation of steel-wheeled transit vehicles on steel rails may develop short-pitch corrugation of the rails. The interaction of the wheels rolling over the corrugated rails generates noise
Problem Statement Transfer mobility measurements are used to help predict vibration and ground-borne noise impacts from transit and rail systems and also to evaluate the effectiveness of vibration mitigation techniques.
Problem Statement More than 100 automated people-movers (APMs) of various kinds and sizes now operate around the world. Urban planners, engineers, and architects often consider using APMs to link activity
Problem Statement Among the many types of on-road vehicles traveling the American highway system, heavy trucks are the loudest frequently-heard noise sources. Comments from residents near highways at project public
In light of the requirement for state DOT’s to update their noise poicies, it would be beneficial to compare the policies for regional and nationwide trends.
CAN RUMBLE STRIP NOISE BE MITIGATED WITH A NOISE WALL? DO CONCRETE PARAPET WALLS REDUCE TIRE PAVEMENT NOISE IN THE FIELD? DO CLEAR WALLS PROVIDE AN ADDED ACOUSTIC BENEFIT IN
Objective would be to investigate various methods of mitigating noise from joints on overpasses. Look for practical methods that are both cost effective and easy to install/maintain. These methods can
Testing of a noise reduction panel that has a .95 NRC (noise reduction coifficient) for a lower decibel rating. Mounting panels on existing walls and taking decible readings from different locations.
We propose a novel, flexible, cost-effective, laptop-based, in-situ measurement system that will be capable of gathering all necessary data in a practical way while also enabling the testing of a
This research project will apply a transport equation to predict noise distributions in long spaces/enclosures when multiple sources are present. Potential applications are transportation infrastructures such as tunnels, subway stations,
Environmental noise pollution relates to ambient sound levels beyond comfort levels; as caused by traffic, construction, industrial, as well as some recreational activities. It could aggravate serious direct as well
South Carolina DOT would like to research how its Traffic Noise Abatement Policy compares to other states in the southeast, as well as the nation. Comparison of such items as:
Noise Barrier Maintenance Costs: the scope of the project consists of surveying state DOTs to determine the annual (or periodic) maintenance costs of noise barriers (by material type). The results
RESEARCH THE RELATIONSHIP BETWEEN TRAFFIC NOISE, NOISE WALLS, NOISE REDUCTIONS, TRAFFIC, AIR QUALITY, AND ATMOSPHERIC CONDITIONS VIA 24/7 WEATHER, TRAFFIC, AND NOISE STATIONS.
The objective of this research is development of a Practitioners Handbook for Noise Wall Inspection Procedures During and Post Construction. The completed handbook will provide state highway agency staff and
The objective of this research is development of a Practitioners Handbook for the Noise Analysis Process for Design Build Projects. The completed handbook will provide state highway agency staff and
DOTs are not currently creating renewable energy via existing or new noise wall construction. Noise wall posts are currently only used to hold noise wall panels in place. Research is
Much of the nation’s transportation system needs updating or replacing and some of this infrastructure is in-and-around environmentally sensitive marine environments. Removing underwater concrete bridge piers and rock outcroppings can
The objective is to develop a consistent methodology for analyzing noise and vibration impacts on different terrestrial species. Develop standard metrics and procedures for the DOTs to conduct noise analyses
While 23 CFR 772 outlines how state DOT’s will implement noise analysis and abatement procedures for highway improvement projects, many of the important policy decisions are left to the states
The FHWA’s Traffic Noise Model (TNM) software must be used to analyze noise impacts on federally funded highway projects. TNM analysis is based upon a 25-year-old vehicle noise reference emission
Recent advances in highway acoustic noise measurement technology have shown most vehicle noise generators are either at the tire/pavement interface or are positioned within 3.3 feet above the roadway surface.
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