I think this intersection of A1 and B6438 is not mapped not only overly complicated, but also wrong. Currently, it depicts many separated slip roads, which do however not exist. Also, carriageways are not separated, there is just a dashed area of white diagonal stripes.
In its current form, the mapping also prevents correct routing, as coming from B6438 (N) - it is allowed to turn right onto A1, but that is not possible with the current mapping.

I think this mapping too much mimics the intersection of e.g. A1 and B6437 (http://www.openstreetmap.org/#map=18/55.85708/-2.23162), which does have separated carriageways and slip roads.

I will simplify the intersection in the upcoming days, if there are no objections