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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.
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.)