... from Dusseldorf airport
Motorway "All directions", then the A44 in the direction of Velbert, at the next Motorway (Autobahn) junction take the A3 towards Cologne (Köln), at the Hildener junction take the A46 in the direction of Wuppertal (continue as "from the direction of Dusseldorf").

... from the direction of Dusseldorf
A46 exit Wuppertal-Cronenberg/Ronsdorf, through the "Burgholz"-Tunnel, continue in the direction of Wuppertal-Cronenberg/Ronsdorf (L418), take the 2nd exit Technologiepark/Zentrum W.-Elberfeld. Turn right at the top exit. Go downhill for 150 m taking the entrance on the right to the KELLER Technology Centre.

... from the direction of Dortmund or Cologne (Köln)
A1 exit Wuppertal-Ronsdorf, then towards Wuppertal, approx. 1km straight ahead, take a left turn at the next traffic light on the large bridge in the direction of Cronenberg, cross the large bridge and keep following the main road (approx. 5 km in direction of Cronenberg). Behind the bridge (at the water tower) start counting the exits. Take the 3rd exit Technologiepark (note: do not take the first exit at the BEK building towards W.tal-Elberfeld/ Zoo/ Düsseldorf!). Turn left at the top exit. Go downhill for 150 m taking the entrance on the right to the KELLER Technology Centre.