Good solutions (Noise barriers & transparent walls)
Before you use glass at sites where it could pose a danger for birds, please consider:
- Does it have to be transparent or highly reflecting glass?
- Non-transparent noise barriers (e.g. made from wood) make good ecological sense and may reduce the noise more effectively.
- If transparent material is unavoidable please mark the walls with stripes to make them perceptible for birds. We recommend you the European standard defined by COST 341.
Noise barrier on a highway bridge, equipped with standard stripes (2cm/10cm) applied already during production. The stripes should have a certain degree of contrast under different light conditions.
Similiar prevention measure as above, using a ribbon of the colour "crystal". It is not so easy to stick them on in a very even pattern and depending on the prodcut the longevity of such stripes is rather reduced.
These stripes have a width of only 1cm; the distance between them is 5cm. The effectiveness is similiar with the measures shown above. However, the aspect is a bit lighter.
Horizontal stripes on a noise barrier in a residental area in Vienna. The high desity of stripes, covering up to 50% of the glass panes, provide of course an optimal protection. However, this glass type still may reflect - depending on the angle - parts of the surroundings (as can be seen on the second photograph).
Wind shelter in a football stadium. After a series of collisions these panes were equipped with dark stripes which had a good success. The mounting itself was rather difficult.
Noise barrier in an Austrian town, with a pattern designed by Hil de Gard. Original idea providing an effective protection. However, it's not the cheapest solution...
Noise barrier with squares (5 x 5 cm, 10 cm apart) in "crystal". In a field test this pattern provided good results.
Important: Vegetation attracts birds and thus multiplies the collision rates along transparent barriers! Either you want an undisturbed view, using a transparent wall. Then you should cut down all bushes and trees. Or you want the wall camouflaged with vegetation - but then the wall doesn't need to be transparent!