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I've personally never tried any of those options above, but I recommend hitching from the Aral petrol station on Leo-Wohleb-Straße 2. Freiburg is relatively small, so if you are in the city anyway you can very easily walk to this spot. This road goes along the Dreisam river and leads onto the A5 autobahn. In fact you will pass the hitching spot recommended in the 1st first paragraph. I don't recommend that spot because its a 4-lane traffic and difficult for cars to pull over, although many people hitch from there. Waiting times at that Aral petrol station vary but I recommend starting it is recommended to start early so you catch workers commuting to other cities. You'll get drivers going north and south, you just need to ask around.