Motorway A7 to exit Seesen; road B243 direction Osterode; after approx. 5 km road B242 to Clausthal-Zellerfeld.
Before entering Clausthal-Zellerfeld turn left to direction district "Zellerfeld". (The turnoff appears after a very steep double bend with loads of road signs.)
In Zellerfeld turn right to follow the road B241. After giving way when entering the roundabout (with buildings in the middle) follow the B241 (basically go straight on, technically it is the second exit of the roundabout).
Motorway A2 to Kreuz Braunschweig-Nord; highway A391 to Dreieck BS-Südwest, from here direction Bad Harzburg; highway A395 to Bad Harzburger Dreieck; road B6 direction Goslar; from Goslar road B241 to Clausthal-Zellerfeld.
In Clausthal-Zellerfeld follow the road B241. After giving way when entering the roundabout (with buildings in the middle) follow the B241 (basically go straight on, technically it is the second exit of the roundabout).
... take the next road to the right. Is the "Robert-Koch-Straße".
After passing two smaller streets and another 100 m the Institut for Mechanical Engineering lies right in front of you.
Parking lots in front of the building.