A real plus for people and the environment


When a low-noise road surface is laid somewhere in Switzerland, developers, construction firms and residents want to know how great the noise-reducing effect of the new road surface actually is. Alongside this initial effect, there is also particular interest in how the acoustic properties of the surface will develop over time under constant stress from the traffic driving on it.

Our solution

We analyse the acoustic properties of the road surface and its changes over time. For a precise evaluation, we can draw on a whole range of measurement methods, extensive knowhow, experienced engineers, and a large pool of own measuring devices.

Service description

  • CPX (close proximity): G+P’s two standardised measurement trailers enable that the acoustic quality of the road surface can be recorded continuously over the entire length of a section. The acoustical properties as well as the homogeneity of the road surface is assessed.
  • SPB (statistical pass-by): Leq and Lmax from individual pass-bys are recorded using two-channel measurement devices and the acoustic quality in the section measured is calculated. The method is used in particular to check the validity of the acoustical properties with regard to the statistical vehicle mix.
  • Random noise emission sampling: This is a simplified process which is suitable for ascertaining the effect of the road surface taking into account sound propagation effects. It has lower validity with regard to the repeatability of the measurements and the accuracy of a road surface's performance. 

Contact persons

Erik Bühlmann – 031 356 20 06
Tina Saurer – 031 356 20 04


Monitoring low-noise road surfaces