N18 highway

Around the N18 are the Slangenburg, Wrange, and Montferland nature reserves. Because of the N18, these areas were no longer connected, therefore five dense fauna tunnels were constructed to re-connect the areas and keep the wildlife separate from the traffic.

Issue

A condition from the clients of the Municipality of Doetinchem and Rijkswaterstaat was that the fauna tunnels should continue to function for a long time, way into the future. The closed tunnels must be completely closed and laid under the road surface. Reptiles in the Netherlands are of small size and have limited maneuverability and climbing capacity. Reptiles also place very high demands on fauna provisions. In addition, consistent maintenance and management are of great importance for the proper functioning of fauna passages. The client wanted to ensure that the tunnel would be interesting during the day for reptiles, amphibians, hedgehogs, badgers, etc.

Solution

Because of the length of the tunnel, a decision was made to install 3 prefabricated 35 cm Solatube fauna daylight systems per tunnel. As the systems were completely prefabricated, installation on-site was easy; In addition, the systems are low in maintenance. Since the construction was completed, various investigations have been carried out to determine whether the fauna tunnels function as desired and the results show that the tunnels are used with great regularity.

Finally, 350 metres of 'wild-fencing grids' have been placed between the fauna tunnels, to ensure that the animals can find the entrance to the tunnel and do not cross the road.

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