Comparison of traffic noise model 2.5 with 2.1 and measured data

    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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