The figure I've seen is 50% of Autobahn is without speed limit, 25% with permanent limits (due to noise control, permanently high traffic volume or intersectio

The figure I've seen is 50% of Autobahn is without speed limit, 25% with permanent limits (due to noise control, permanently high traffic volume or intersections) and 25% with temporary limits (depending on buildings works, weather, congestion). Of course the perception is probably worse because more people use the congested parts with speed limits, and due to the limits they spend more time on those parts...