Just came back from my parents in BM, part of the way over the Autobahn A46 and the Theodor-Heuss Brücke in Düsseldorf. While driving I recorded the track and had a chance to compare the path with map. It was obvious that the map has some gross simplifications. Sometimes I swerved away from the line on the map to hit it exactly a few hundred meters later. This looks like they just left out a few points from the path.

At home I loaded the track into JOSM and compared with OSM. According to OSM I drove right on the road all the time:-)