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An other option is the Aral gas-station at Kaiserdamm near the central bus-station. Take U2 to Kaiserdamm (if you come from direction Zoo) and go out in the driving direction. Leave the station on the left exit. After 50m there is the gas-station.
It depends on the day. Sometimes it's very easy to get away, sometimes it's harder.
'''Trampstelle Potsdam'''
There is a local campaign for an official hitch-hiking spot in Potsdam, near to the central station, on the road to Michendorf. It doesn't exist yet, but you can sign the petition here and hope it will be there soon.
http://potsdam.moonsword.info/unterschriften.php?lang=de
'''Rasthof Michendorf''' - just 30 minutes by RegionalTrain southwest of Berlin - is Hitchhikers' heaven. You easily get hitches to the south west as well as to the east (Poland). Take a train (for example RE3 to Dessau) from the centre (2.60 EUR) get off at Michendorf and find your way to the gas-station (map in front of the train station) which is surrounded by a wall - follow this wall and enter through a iron door!