Addendum to validation of FHWA's Traffic Noise Model (TNM) : phase 1
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2004-07-01
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Alternative Title:TNM version 2.5 : addendum to validation of FHWA¿s Traffic Noise Model® (TNM) : phase 1
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Edition:Final Report; Sept 2002 - July 2004
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NTL Classification:NTL-OPERATIONS AND TRAFFIC CONTROLS-OPERATIONS AND TRAFFIC CONTROLS;NTL-ENERGY AND ENVIRONMENT-ENERGY AND ENVIRONMENT;
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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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