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The road's already marked as D1 well before that junction
Is it? I can see that the other side of the road (Westbound) is D1 motorway at that point, but Eastbound is still the E50 as far as I can tell.
(The various online maps all say different things, I'm going by the roadsigns visible on Streetview.)
Greenbank-
Is it? I can see that the other side of the road (Westbound) is D1 motorway at that point, but Eastbound is still the E50 as far as I can tell.
Well, the 'E' road network is comprised of all sorts of roads--road 18 is an 'E' road and then D1 becomes its continuation, briefly counting as a non-motorway (because of the junction I mentioned, where left turns onto the old road aren't possible, meaning that a short stretch of D1 has to be open for non-motorway vehicles because otherwise they'd have nowhere to go). Undoubtedly they already have plans to build the next section of motorway, probably along or close to the old alignment of road 18, but as this sort of project is costly, they're having to hold off for a few years. At that time, they'll build regular motorway-style junctions like the one further up, too.
Oliver Schick
Yes, there's a sign that indicates the start of motorway status. The road's already marked as D1 well before that junction, so just the status as D1 doesn't automatically ban bikes.
This junction looks very hazardous to me.
https://www.google.co.uk/maps/@49.0908268,19.4069432,3a,18.3y,72.3h,88.88t/data=!3m6!1e1!3m4!1se_G87caOH6Os895GWm7F5g!2e0!7i13312!8i6656
It seems to be a bit of a bodge job from when they constructed the motorway section. Drivers are prohibited from entering road 18 there (which is undoubtedly also why Björn continued to the service station there) by means of a sign and a solid white line. You bet that plenty of drivers will take chances there, though. This bit is also very good:
https://www.google.co.uk/maps/@49.0908268,19.4069432,3a,18.3y,72.3h,88.88t/data=!3m6!1e1!3m4!1se_G87caOH6Os895GWm7F5g!2e0!7i13312!8i6656
I daresay many people will disobey the banned turn and the 'no vehicles of any kind' sign there.