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Colourful Tunnel Lighting

Colourful Tunnel Lighting

Light and Shadow

The needs of human beings and bats were a top priority of the SAG lighting project for the Nordbahntrasse in Wuppertal, Germany.


SAG was awarded the contract to install the lighting on the approximately 14-kilometer long route of the Wuppertal Nordbahntrasse.

SAG 266 built LED lights on steel towers along the route. There is a total of five tunnels with a total length of 1.27 kilometers. Cable trays were installed in these tunnels, involving a total of 151 special LED lights. The colour and height of the lighting were chosen so that the bats inhabiting these tunnels would not be disturbed. For example, no green light was used as the protected bats do not like this colour and would no longer use a green-lit tunnel as their hideout.

The different colours of the tunnel lighting also serve cyclists and pedestrians for orientation. In case of an emergency call, the caller only has to state the colour of the lighting and the emergency services immediately know which tunnel to go to.