The general objective of the INQUEST project is to foster the use of low-noise road surfaces throughout Europe by disseminating the tools developed by the European project SILVIA. Dissemination will focus on the contents of the Guidance Manual developed by SILVIA (Sustainable Road Surfaces for Traffic Noise Control). One of the main outputs of SILVIA is an acoustic classification procedure for road surfacing materials and technologies. A complementary objective of the INQUEST project is to promote European harmonisation of testing methods and equipment for this purpose.