Mixtures with special additives are being produced for roads, offering noise reduction and aiding recycling. Patrick Smith reports. Noise-reducing road surfacings have been used in motorway construction for some time. But relatively new are noise-optimised surfacings used on roads in towns that do not follow a standard concept.Road trials with these materials have taken place in Germany since 2007 and have been prioritised due to the European Union Guidelines on the Assessment and Management of Environmenta