Acoustic evaluation of road surfaces using different Close Proximity testing devices

According to the valid standard, Close Proximity (CPX) method intends to evaluate the influence of road surfaces on traffic noise. Measurements may be carried out with the use of a self-powered vehicle or a special test trailer equipped with testing tyre towed by another vehicle. Two different testing devices took part in the research organized in Poland in order to determine the ranking of road surfaces in terms of acoustic parameters. Two tests (in the year 2018 and 2019) were carried out on 6 different road sec-tions with different wearing courses. Road surfaces were ranked, which enabled comparison of the two measuring systems, based on the same standard. Obtained results revealed some differences within mea-sured values ranging from about -1 dB to + 2 dB, which led to ranking changes concerning the best road surface in terms of limitation of traffic noise.(c) 2023 Elsevier Ltd. All rights reserved.

Automated summary

According to valid standards, the Close Proximity (CPX) method is used to evaluate the impact of road surfaces on traffic noise. Two different testing devices were used in a research conducted in Poland to rank road surfaces based on acoustic parameters. The results showed differences in measured values, leading to changes in the ranking of the best road surface for limiting traffic noise.