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I hitchhiked at the stoplight just before the tram turns right to Hochshule/Läger, with a sign [[Heidelberg]]. A lot of the cars are local traffic, licenced KEL or OG (see: [https://en.wikipedia.org/wiki/Vehicle_registration_plates_of_Germany german licence registration plates]). So as soon as you find someone willing to get you a lift in your direction accept it. I was going towards the north, so I managed to get a lift to Achern, and the person left me at Serways Raststätte Renchtal Ost, I tried to ask around, and then I ended up hitching from the exit of the freeway service area.