00643516

Component

http://onlinepubs.trb.org...trr/1993/1416/1416-010.pdf

https://scholar.google.co...sson&publication_year=1993

The noise abatement efforts used on I-440 were studied to evaluate their effectiveness. The results of tests confirmed that the FHWA abatement criterion for land use Category B receivers had not been exceeded at any of 40 representative sites. The Tennessee Department of Transportation criterion for substantial increase in levels at receivers due to new highway sources was exceeded at only 2 of 40 sites. Noise level reductions of as much as 9.5 dB at the receiver locations were attributed to depressing the roadway (cut) with the average being 2.8 dB. Of the sites tested, 75% realized at least a 5 dB reduction because of barriers alone (in addition to effect of cut, if any). The results of 24-hr measurement periods show the variation in traffic noise levels as well as background influences on levels and insertion loss determination. Comparison tests of absorptive and reflective barriers at two sites indicated that benefits were realized by the use of absorptive barriers on fill sections where barriers were installed close to shoulders. An evaluation of the FHWA STAMINA 2.0 model for highway traffic noise indicated that the model tended to predict levels higher than those measured. Insertion loss results were obtained using the ANSI S12.8 indirect predicted method of insertion loss determination. This method's dependence on the accuracy of the prediction model was seen as a limitation on its usefulness.

This paper appears in Transportation Research Record No. 1416, Environmental Analysis, Air quality, Noise, Energy, and Alternative Fuels. Distribution, posting, or copying of this PDF is strictly prohibited without written permission of the Transportation Research Board of the National Academy of Sciences. Unless otherwise indicated, all materials in this PDF are copyrighted by the National Academy of Sciences. Copyright © National Academy of Sciences. All rights reserved

01402446

English

p. 75-81

1993

Transportation Research Record

0309055636

Figures (7) ; References (2)

Absorptivity; Alternatives analysis; Depressed highways; Field tests; Forecasting; Measures of effectiveness; Noise barriers; Noise control; Reflectivity; Sound level; Traffic noise

Effectiveness; Field measurements; Insertion loss; Reduction (Decrease)

Design; Environment; Highways

TRIS, TRB, ATRI

Mar 1 1994 12:00AM

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