
Measurements on Real Urban Traffic Noise Demand Higher Accuracy on Local Data to Get a Representative Application of Cnossos-EU
Noise emission at low speed is acquiring a higher relevance to get representative results in urban noise mapping. The results of pass-by noise measurements on real urban road traffic in several streets offer a reference to assess the accuracy on strategic noise maps. Results of measurements
carried on at different streets of three cities, mainly on light vehicles, show clearly how noise levels decrease when speed diminishes from 50 to 20 km/h, confirming how effective are policies that reduce speed limit in cities to attenuate noise in urban areas. Besides they also offer a reference
on the dispersion data in real traffic measurements and a comparison with noise emission of different calculation methods. Conclusions advert that Cnossos-EU have the risk, at least in the test area, of underestimating emissions respect to real noise levels if the different variables established
in the method to describe the sound power levels, are not well adjusted to the local values. To get realistic results for urban traffic noise, it will be required a more detailed local emission characterization and better input data as pavement type, age and maintenance conditions. Solving
that, Cnossos-EU will contribute to improve the accuracy on urban noise maps.
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Document Type: Research Article
Affiliations: AAC Centro de Acústica Aplicada S.L. Vitoria-Gasteiz (Spain)
Publication date: 30 September 2019
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