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One possible option could be near bus stop ''Südhöhe'' (Lines 72, 76 & 360). There is a petrol station ("Aral") but it is located on the opposite side of the road. It's the last petrol station before the motorway though. You could also try to stop cars on various bus stops, usually near traffic lights, throughout all the way on a ''Bergstraße'', however, most of the road is an upward slope which makes it difficult for the drivers to stop (or to get back on the road).  Probably the best spot on ''Bergstr.'' is Haltestelle ''Mommsenstr.'', where you can easily stand close to the bridge and ask people at the traffic light.  Try to get to the first parking lot right after getting on the A17, since the people going to Pirna are also passing there. There are not very many people, but surely everybody is going across the border to the first gas station in [[Czech Republic]].