http://worldcat.org/entity/work/id/114288814

Evaluation of ARMCO sound barriers on two bridges on I-495. Final report

The purpose of this study was to determine the effectiveness of ARMCO double-wall, steel noise barriers attached to bridge parapets so as to provide continuity for roadside barriers. Measurements were taken opposite the sites of the discontinuities on two bridges before and after the gaps were filled. The measurements were recorded in both the analog and digital modes using the technique described in reference 2 of this report. It was concluded that the bridge barriers significantly contributed to lessening the impact of traffic noise on the adjacent communities. It was also concluded that the expansion joints used in the bridge decks created an annoying noise when crossed by traffic, and that such noise should be ameliorated where it occurs.

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