I have never done it before and I have a general question about hitchhiking.
Let's say I want to go from Paris to Berlin. It's around 1000 Km. Now, I really doubt that there are many cars going directly from Paris to Berlin, but they might be going to the cities which are on the way (more or less at least), such as: Liege, Cologne, Frankfurt am Main, Dortmund, Hanover, Magdeburg, Leipzig etc.
If someone is going to one of those cities, what are the chances that he is gonna stop for me if I'm holding "Berlin" , and offer a ride to the city he is going to?
Or, it would increase the chances of me getting to Berlin, if first I'm holding some big city which is on the way from Paris to Berlin?