From Seesen on the northwestern edge of the Harz near the A 7 motorway it runs through the Upper Harz past Clausthal-Zellerfeld, the High Harz, where it is combined for several kilometres with the B 4, past Braunlage and then through the eastern Harz foothills into Mansfelder Land.
Bundesstraße | Bundesstraße 4 | Bundesstraße 6 | Bundesstraße 27 | No. 242 Group RAF | Bundesstraße 14 | Bundesstraße 10 | No. 242 Squadron RAF | German ''Bundesstraße'' 437 near Stadland | Bundesstraße 8 | Bundesstraße 71 | Bundesstraße 51 | Bundesstraße 300 | Bundesstraße 299 | Bundesstraße 248 | Bundesstraße 242 | Bundesstraße 16 |
The Carlshaushöhe and the Carlshaus Tower are located between the B 242 (north), B 81 (east) and B 4 (south) federal highways, so that it can be reached by walking trails leading from the car parks on these roads or their side-roads.