The development and modernization of society is also accompanied by an increase in noise from various sources, among which the most common and worrying is noise from road traffic. Its excessive increase not only devalues the living environment, but also has a significant impact on human health. Negative effects mainly depend on the intensity and duration of exposure. For this purpose, we conducted a study on the impact of noise barriers on noise pollution on the motorway section A1 Brezovica - Vrhnika. For the purpose of assessing their impact, we took measurements along both driving directions of the motorway at different layouts of the noise barriers. Measurements were performed at measuring points of different distances, namely between 10 and 500 m distance from the motorway. The analysis showed that noise barriers have a noticeable effect on reducing noise up to a distance of 150 m from the motorway. On average, they reduced noise at a distance of 10 m by 13 dBA, at 50 m by 8.9 dBA, at 100 m by 3.8 dBA and at 150 m by 1.1 dBA. At 200 m, the noise was reduced by only 0.9 dBA. Between 200 and 500 m, the impact of noise barriers was zero or even slightly negative. There were also detected some sound reflections caused by noise barriers at individual measuring points. Due to the relatively poor efficiency of the latter, it is therefore highly recommended to reduce the noise at its source.
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