Title

Comparison of traffic noise model 2.5 with 2.1 and measured data

Authors

Authors

A. A. El-Aassar; R. L. Wayson; J. M. MacDonald;Trb

Comments

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Keywords

Engineering, Environmental; Engineering, Civil; Transportation Science &; Technology

Abstract

Traffic Noise Model Version 2.5 (TNM 2.5) will soon be the official traffic noise model required by the FHWA for federally funded projects. TNM was updated from Version 2.1 to 2.5 to address two major issues: the overprediction found in the previous version of TNM and an anomaly related to diffraction points. This research focused on comparing the TNM 2.5 predicted results with TNM 2.1 predicted values and with measured data from 18 barrier locations in Florida. Matched pairs of predicted and measured differences between the data for TNM 2.5 and TNM 2.1 were evaluated and a direct comparison of the two models was made. This research demonstrated that the predicted results from TNM 2.5 had an average error for all 18 barrier locations of less than 1 dB. However, when each of the sites is evaluated individually, TNM 2.5 has a tendency to underpredict slightly at many of the evaluated barrier locations. Finally, TNM 2.5-predicted results tend to be about 3 dB(A) on average less than TNM 2.1 at a defined reference measurement position, which is relatively unaffected by ground effects or diffraction, and about 1 dB less at microphone positions behind evaluated barriers when compared with TNM 2.1.

Journal Title

Energy and Environmental Concerns 2005

Issue/Number

1941

Publication Date

1-1-2005

Document Type

Article

Language

English

First Page

149

Last Page

154

WOS Identifier

WOS:000237195300019

ISSN

0361-1981; 0-309-09416-X

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