N18 highway, the Netherlands

The nature reserves of Slangenburg, Wrange and Montferland are located around the N18 motorway. Because of this motorway, the areas are no longer connected. 5 dense fauna tunnels provide the solution to reconnect the areas and keep the animals safely away from the traffic on the road.


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.

Reptiles in the Netherlands have a small size, maneuverability and climbing ability, which means that there are high demands on the fauna facilities for reptiles. In addition, consistent maintenance and management are of great importance for the proper functioning of fauna passages. The client wanted to use daylight to ensure that the tunnel would be of interest to reptiles, amphibians, hedgehogs and badgers during the day.


Due to the length of the tunnel, it was decided to install 3 Solatube daylight systems per tunnel. The systems used here are the prefab fauna systems with a diameter of Ø 35 cm with a round mounting plate. The positioning is as follows: one almost at the beginning, one in the middle and one at the end. In this way, the animals that move through the tunnel always have the feeling of seeing the end of the tunnel.

Because the system is delivered completely prefabricated, installation on site is easy. In addition, the systems are low maintenance; ideal for hard-to-reach places like motorways. Various studies have now been carried out to determine whether the fauna tunnels are functioning as desired and this shows that the fauna tunnels are used regularly.

A28 highway, the Netherlands

Roads and canals cut through various nature reserves in the provinces of Drenthe. As a result, they impede the habitat of the otter and the ring snake, among other animals.


How to provide daylight into a dense round fauna tunnel under the A28.


The solution was to construct a fauna tunnel and install two Ø 25 cm Solatube daylight systems to provide the necessary daylight.

Ringbaan Noord Weert, the Netherlands

The existing roundabout at the intersection could no longer handle the traffic. Instead, a turbo roundabout was constructed, with a tunnel for pedestrians and cyclists.


How to provide sustainable and safe lighting in the tunnel for pedestrians and cyclists.


The installation of two Ø 53 cm diameter Solatube systems, with double domes into the middle of the bicycle and pedestrian tunnel. A special custom finish ensures that both systems are vandal-resistant from below. In the evening and at night the light in the tunnel is supplemented with LED lighting.

Parking garage park 20 | 20 Haarlemmermeer, the Netherlands

Park 20 | 20 in the Haarlemmermeer, near Amsterdam, is the world's first fully operating Cradle to Cradle working environment. The project was developed by Delta Development Group, VolkerWessels and Reggeborgh Groep. The park is built on a half-sunken parking garage of approximately 40,000 m². In addition, the park is provided with a Breeam certificate.


The construction materials used had to be as environmentally friendly as possible, have a long service life and recyclable for reuse. To reduce the energy requirement, daylight was required within the parking garage, however the ability to be able to walk on the daylight systems was required due to the various platforms and gardens on top of the parking garage.


Various daylight tubes were used and fitted with a low profile Deplosun glass daylight collector which meant that the systems could be walked over. The Deplosun materials are provided with a Cradle to Cradle certificate and the daylight ensured that the required daylight points could be entered for the Breeam certificate.

Fauna tunnel system location N381, the Netherlands

Work started mid-2018 on doubling the width of the N381 between Donkerbroek and Oosterwolde and is due to be completed mid-2022.


The existing fauna tunnels underneath the road had to be extended. The extension of the badger tunnels had to be completed in just one day, so that the migration routes for the animals could continue  to be used.


5x prefabricated Solatube fauna tunnel daylight systems were delivered on the day that the fauna tunnels were extended. The work was completed as required and the fauna tunnels were open for use by animals again that evening. The daylight systems help the animals to navigate correctly through the tunnel rather than becoming disorientated and turning around half way through.

Roundabout and bicycle tunnel, the Nederlands

A relatively large number of traffic accidents occurred on the Brabantweg - Weverstraat roundabout every year. In most traffic accidents, there was a (moped) cyclist who was not given priority by a motorist. This unsafe traffic situation has led to many complaints for years and required a structural solution. Work on the construction of a bicycle tunnel near the Weverrotonde and the reconstruction of Weverstraat was carried out in 2019. The project was achieved with financial support from the Province of Limburg.


In collaboration with the Municipality of Gennep, Roelofs took care of the entire process, from design and environmental management to the implementation and realisation of the bicycle tunnel. The objective was to achieve the maximum quality within the available budget. This included opportunities in the field of innovation and circular applications. Due to the length of the tunnel, daylight in the middle was no longer possible.


One 53 centimetre diameter Solatube system was installed into the central reservation of the road which provides the middle of the bicycle tunnel with daylight. A  tailor-made finish ensures that the system is vandal-resistant from below.

Stay up to date with the latest developments!

Subscribe to our newsletter.

We are happy to handle your data with care. They will be treated according to the privacy terms and conditions. Of course they will not be shared with third parties.