The noise level from ‘fluisterasfalt’ [silent asphalt], as it is termed by our Flemish friends, or ‘ZOAB, zeer open asfaltbeton’ [very open asphalt concrete], as we like to refer to it in the Netherlands, is probably 20 decibels lower than that from cobblestone roads.
Fluisterasfalt, zoals onze Vlaamse vrienden dat noemen, of ZOAB, zeer open asfaltbeton, zoals we in Nederland zeggen, is wel 20 decibel stiller dan een weg met kinderkopjes.