Based on the first results, the noise on the rubberised asphalt surface was 3 db lower than on mastic asphalt and even 4db lower compared to asphalt concrete. And according to Kurdna, noise levels are substantially reduced by 4 - 6 dB in the frequencies which the human hearing is the most sensitive to, that is more than 1,000 hertz.

Source: https://zlinsky.denik.cz/zpravy_region/gumoasfalt-u-zadveric-pry-snizuje-hluk-z-provozu-20120620.html