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  Over a period of up to seven years, the tyre/road noise and the pavement texture of low-noise road surfaces were measured on a series of up to 21 full-scale sites situated in urban areas with a speed limit of 50 km/h. The study involved a wide range of noise reducing asphalt mixtures, including semi-dense macro rough asphalt AC MR and porous asphalt PA. It has been shown that the acoustic performance decreases asymptotically as a function of traffic volume. For PA the decrease can be delayed provided the pores do not become clogged by dirt.
content link: http://www.bafu.admin.ch/laerm/08969/index.html?lang=en
content language: English
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This content is related to:
project type
National projects 
area of interest
 noise & vibration
 road surface properties
user type
road authorities/owners 
research labs 
city authorities 
construction companies 
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