For most visitors to East Berlin and the GDR, including persons who utilized the land transit routes (road and rail) between West Germany and West Berlin, their exposure to the  consisted of dealing with the members of the Pass and Control Units (, PKE) who processed travellers passing through the GDR's  (border crossing points).
For most visitors to East Berlin and the GDR, including those who utilized land transit routes (roads and railways) between West Germany and West Berlin, their exposure to the  consisted of interacting with the members of the Pass and Control Units (, PKE) who processed travelers passing through the GDR's border crossing points.