Influence of Environment- and Traffic-related Factors on Acoustical Ageing of Low-noise Road Surfaces in Switzerland

Invited paper

Marlène Dias

Swiss Federal Office for the Environment FOEN

Tuesday 2 june, 2015, 15:40 - 16:00

0.2 Berlin (90)

Low-noise road surfaces have become a popular and widely used measure in Switzerland to combat road traffic noise at its source. Altogether, more than 300 low-noise road surfaces have been constructed in urban areas over the last decade on road sections where traffic noise exceeded the legal limits. To determine their long-term performance in terms of noise reduction, most of these surfaces have been subjected to repeated tyre/road noise measurements. Such measurements have shown that the loss of acoustic performance over time can vary substantially on different road sections. The explanations for this, however, remain unclear. This article aims to shed light on the reasons for differing acoustic ageing behaviour of low-noise road surfaces by investigating environment- and traffic- related factors on the particular road sections. Multivariate regression analysis was used on extensive measurement datasets and a wide range of environmental and traffic descriptors obtained from spatial analysis. We, further, discuss the required conditions for application of particular low-noise road surface types with respect to local environmental and traffic conditions. We conclude by proposing an approach to reduce the risk of acoustic performance loss and failure.

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