By car:

Coming from Amsterdam/Schiphol Airport
Follow successfully the signs: A4 Utrecht/Haarlem/Amsterdam-A9 Amstelveen/Utrecht/Badhoevedorp/Haarlem – A9 Amstelveen/Utrecht. A2/A9 Almere/Amersfoort/Amsterdam – A9 Amsterdam Zuidoost/Almere/Amersfoort – A1 Almere/Amersfoort – A6 Almere/Lelystad – A6 Lemmer/Groningen/Leeuwarden – A7 Heerenveen/Leeuwarden/Groningen – A7 Drachten/Groningen – Exit A7 direction Martini van S. Hospital. Take the first street at the roundabout, then the first street on your right.  
  
Coming from Zwolle-Assen (A28)
Exit Groningen Zuid. Turn left direction Martini van S. Hospital. Turn left at the second traffic light. Take the first street at the roundabout, then the first on your left.
  

Coming from Heerenveen-Drachten (A7 west)
Exit A7 direction Martini van S. Hospital. Take the first street at the roundabout, then the first street on your right.
  

Coming from Germany-Winschoten-Hoogezand (A7 east)
Exit Ring Groningen-Zuid, direction Emmen-Assen (A28). Exit Groningen Zuid. Turn right, direction Martini van S. Hospital. Turn left at the second traffic lights. Take the first street at the roundabout, then the first on your left.
 

By train:

Coming from Amsterdam/Schiphol Airport
A direct train takes about 2½ hours. Then take a taxi at Groningen Central Station: 10 minutes drive to OPHTEC.