Sorry, should have closed it earlier.

Was driving there using both OsmMand and a Garmin Nuvi with OSM maps.

The Garmin then suggested a very odd route here. So either Garmin cannot route, there was a problem with OSM or the translation to Garmin maps is wrong, or I had chosen bad routing parameters. This was a quick not to myself  to investigate. But I could not find anything wrong with the maps. But now I see that Map-Peter edited just at that time, so maybe he fixed a problem. 
I close the note now.