United States Department of Transportation
i
Noise Wall Overhang Design
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2019-04-01
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[PDF-8.07 MB]
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Abstract:The purpose of this research study was to determine if a roadway-side overhang component could provide meaningful noise reduction and air quality benefits for ODOT's noise walls in a manner that is cost-effective and meets all of ODOT’s structural design requirements. A comprehensive review of literature was conducted to identify past research on overhang impacts and the deployment of overhang designs in North America. Acoustical testing using a full-scale noise wall section was also conducted to determine the combination of overhang length and angle toward the roadway that provides the greatest noise reduction. The results of the acoustical testing were consistent with expectations based on previous studies, indicating that a perceptible noise reduction could be achieved with the overhang fixture. However, a preliminary analysis of the structural requirements and resulting construction costs found that the cost to retrofit an existing noise wall with an overhang was approximately twice as expensive as raising the height of the wall in the vertical direction to achieve a similar noise reduction. Consequently, deployment of overhang designs is not cost-effective for ODOT except in locations where it is not feasible to raise the height of the wall in the vertical direction.
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