United States Department of Transportation
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Addendum to Validation of FHWA’s Traffic Noise Model (TNM): Phase 1
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2004-07-01
[PDF-943.66 KB]
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Alternative Title:TNM Version 2.5: Addendum to Validation of FHWA¿s Traffic Noise Model (TNM): Phase 1 [Title from Cover]
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Edition:Final Report; Sept 2002 - July 2004
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Abstract:(FHWA) is conducting a multiple-phase study to assess the accuracy and make recommendations on the use of FHWA’s Traffic Noise Model (TNM). The TNM Validation Study involves highway noise data collection and TNM modeling for the purpose of data comparison. In 2002, Volpe completed Phase 1 of the study. For this phase, over 100 hours of traffic noise data were collected at seventeen highway sites around the country. The seventeen sites included: open areas next to the highway with acoustically soft ground (e.g., lawn); open areas with acoustically hard ground (e.g., pavement or water); and areas next to the highway with an open area behind a single noise barrier. Results indicated that TNM Version 2.0 was, on average, over-predicting when measured sound level data were not calibrated using a reference microphone, i.e., when site bias was not accounted for. This issue of over-prediction initiated the development of TNM Version 2.5, which addresses the over-prediction and also has other acoustical improvements. This addendum to the Phase 1 report includes results generated with TNM Version 2.5, where the results show TNM’s improved performance.
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