The age of the road surface affects noise the traffic makes - the older the surface, the more noise it makes.

The type, condition and age of the surface may influence the road noise significantly. The effect is normally compared to a reference surface (in Denmark surface type SMA 11). A noise reducing surface is obviously less noisy than the reference surface, but the age and condition of the surface have influence on the noise as well. The noise increases with age.

These examples show a new surface compared to a 7-year old and a 17-year old reference surface (SMA 11).


Please connect your headset to your computer. Make sure that the left and right channels are set correctly.

Start by pressing the black boxes. During playback you can jump between options.

You should not adjust the volume as this will change the adjustment you have already made in order to calibrate your system.

Danish Road Directorate logo
The auralisations are developed in cooperation with the Danish Road Directorate.