How much influence does vegetation have on traffic noise, and what does it take to make it work as noise reduction?

Sometimes, vegetation along the roadside may work as noise reduction. The vegetation must be a forest-like, broad and very densely grown, belt of vegetation – otherwise the physical noise reduction is close to zero. These examples show the effect of a 50-metre broad belt of forest trees (10 metres high) situated 15 metres away from the roadside.


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.

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