Process for driving from West Germany through East Germany to West Berlin:
Check in and receive briefing and a packet of flash cards. The flash cards are in German, Russian and English. In case of a break down, you were ordered to place a card against the window saying, "I demand to speak to a Russian Officer." We were prohibited from interacting with East Germans or Enlisted.
Receive time stamps a different check points. At each check point I had to do proper facing movements, salute the Russian officers and present my papers. I received the stamps and was allowed to continue.
You can see all the time stamps... If an unacceptable time was marked, we were in trouble. NO STOPPING NO SPEEDING