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@Oliver Schick
Heh. Obviously, circumstances are different at different junctions, but generally, the effect of more stacking lanes at junctions will be to increase motor traffic capacity. The capacity gain does not lie in the behaviour of motors when moving but in shortening the queue by breaking it up into more lanes. There will undoubtedly be issues at many junctions with re-merging behaviour, but that would not be enough to offset the effect of more lanes. Remember also that in most cases, multiple lanes take care of several different kinds of manoeuvres, e.g. left-turn only or right-turn only, depending on the flows in each direction.
No, they haven't, of course. However, lane layout at junctions is a surprisingly complex subject. :)