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The bit that Bjorn just passed follows road 18 with a junction to get onto E50, he was tracked at the service station which is on E50 rather than staying left and following road 18 across the junction to turn right (if that makes sense).
I can't work out what happened there--the tracking points are few and far between. Perhaps that section isn't a prohibited road. There's a toll station there, but it looks from the aerial imagery as if it may be for HGVs only. If you look a little further west, there's a very odd tracking point that seems to be in the middle of a field, so either the tracker's not very accurate or he went there to sleep or something.
Oliver Schick-
Bjorn is fine. The E50 is still ok to ride on. Here's the junction that he would have taken to turn off the E50 on to the 18 after that service station:-
https://goo.gl/maps/ovDftMFTQ5N2
It becomes the D1 motorway (prohibited for bikes) after that point so he was ok, you can see the motorway signs a bit further along.
Greenbank
Depends what they deem motorway I guess. The green logo E roads like the E50 near Bjorn look like dual carriageway motorways and the blue logo roads like '18' are smaller fast roads like A roads over here. I assume red and green are banned but blue are ok.
The bit that Bjorn just passed follows road 18 with a junction to get onto E50, he was tracked at the service station which is on E50 rather than staying left and following road 18 across the junction to turn right (if that makes sense).
The earlier bit where he changed routes he seemed to have been confused by the red R1 road which he wouldn't have had to ride on since it turns into the blue 66 road.