I've heard a rumor, austrian policemen are entitled to guess your speed, when they think you've been driving to fast?! Anybody as some more information about that?

In germany, driving on an autobahn with more than 2 lanes, you HAVE TO drive on the right lane except for overtaking. Even many germans think they "are not allowed, as in this case the right lane is for trucks only", therefore anoying me as i have to cross from the right lane to the left and back (giving them a short indication/reminder by the headlights (what's allowed to indicate the intention of overtaking )). Be careful not to interfere with others in this case.