|Motorways:||A44, A46, A52, A61|
When heading north or south, the best place is probably the onramp "Nordpark/West" at the A61. You can easily get there by bus. Just take number 013 or 023 to "Vorster Straße". From there it's just 5 minutes walking.
There is usually quite a lot traffic and enough space for cars to stop.
It is officially illegal to stand here, but MrTweek hitched there a few times, and even passing cops did never bother.