Abstract
This paper presents the geo-referenced acoustical results obtained throughout the close proximity noise (CPX) technique carried out on different urban sections included within the 2017 strategic noise mapping (Directive 2002/49/CE) in Ciudad Real, a Spanish medium-sized city. The employed methodology quantifies the tire/pavement noise generated in the contact between the tire and the surface of the studied sections. Measurements were carried out in different research campaigns between 2008 and 2015 (medium-term evolution). They give valuable information about the pavement-aging effect on its surface characteristics. Throughout these years, the acoustic situation of these sections has worsened mainly due to surface damage and higher mean profile depth (MPD) values, although the performance does not follow the same pattern in every section. The relationships between measured tire/pavement noise and theoretical environmental noise, just due to the geometric spreading of sound energy, is also studied in order to elaborate a simple rolling noise mapping and to assess the environmental noise evolution. Traffic noise plays the main role in the noise registered within the assessed sections, therefore, CPX assessment could be used by local authorities to take decisions regarding urban planning and traffic management, with the aim of reducing noise exposure from traffic.
Highlights
Smart cities should have technological applications but natural and friendly environments to improve citizens’ lives
It is known that noise pollution causes different health issues [3,4,5,6], and, on the other hand, for passenger cars, tire/pavement interaction plays the main role in traffic noise at speeds greater than 40 km/h [7], i.e., the majority of main streets in urban areas
The main scope of this paper is to study the medium-term evolution of tire/pavement noise in the urban areas of a medium-size city
Summary
Smart cities should have technological applications but natural and friendly environments to improve citizens’ lives. The relationship between CPX and SPB (CPB) noise levels is useful in many case studies, as it has been shown in the previous cited works This relation has not been used in this research work due to some reasons that are given below: SPB and CPB methods highly depend on the section where measurements are carried out. The work included in this manuscript is about the street surfaces, their aging and the evolution of the acoustic situation, we consider that the CPX methodology may be the most suitable method in order to predict environmental noise levels from tire/pavement noise (Rolling noise mapping). On the other hand, according to these assumptions, a busy lane (line source with continuous traffic noise), instead of a point source (lone vehicle travelling) is considered in the rolling noise mapping Measurements included in this work were taken during a period of seven years, between 2008
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