Why are passages important

Nature tips - nature conservation and species protection in practice
Amphibian protection on roads

•  The passages should be installed as high as possible in the road structure. As a result, these are better accepted and water is better drained off.•  To be effective, the entire walking corridor (plus 50 m on each side) must be recorded.•  The guidance systems should run as close as possible to and parallel to the road.•  U-shaped ends of the guide devices make walking difficult.•  The guide elements must be stable and stable. Usually they are made of concrete or steel.•  Pay attention to a good floor connection and a gapless closure of the elements.•  The height of the barrier device must be at least 40 cm, for agile frogs 60 cm.•  Since many amphibian species can climb vertical walls, protection against climbing over is necessary at the upper edge.•  On the other hand, it must be possible to overcome the blocking devices from the street side by backfilling at the same height (with a gradient of at least 7% for the water drainage) so that they do not constitute an obstacle to escape.•  For a good guiding effect, make sure that the walls are smooth without protrusions, niches and narrow angles.•  Supports and posts must not be placed on the running side.•  The tread along the guide elements must be at least 20 cm wide. This area should be as unobstructed as possible, without height offset and free of vegetation.•  Careful underfilling and protection against flushing prevents the walking surface from becoming a water channel.•  If the entrance area to the passage is below ground level, sufficient drainage must be provided.•  The longer the passage, the larger the diameter must be. A large opening also allows other animals (e.g. Hedgehogs) Safe crossing under the street. Rectangular frame outlets have a larger base area compared to pipe outlets or semi-circular hoods.•  A layer of topsoil at least 15 cm high must be applied in the culverts. The floor in the passage should be moist, since young animals in particular cannot cross passages when dry. If there is no seepage water flow, a resilient plastic film can be inserted, which has a basin-shaped widening in the entrance and exit area in order to prevent the substrate from drying out.•  The running surfaces must be kept free of vegetation. Do not leave the clippings lying around. Also remove overhanging vegetation.•  The amphibian protection systems must be checked regularly. The times before the spring migration begins, from the end of May to mid-June, before the young animals migrate and in September before the autumn migration begins, are particularly important.•  The culverts must be kept open all year round and should be checked especially after storms and heavy rain.