Possible Pedestrian Pathway?
Right now this might look like the stairway to heaven, but i think this is the possible elevated pathway (crossing) for pedestrians on the Islamabad Expressway.
I am pretty certain that this will turn out to be an overhead bridge for people on foot, making it easier for them to cross the road (reason for this assumption is the similarity of this structure with the the under construction overhead bridges on 7th Avenue). At the same time it might make the life easier for the motorists who might get rid of the yellow speed breakers on the road. Pat on the back for whoever has taken up this initiative to get these bridges built. A little spanking for them as well because it took them so long to take some appropriate useful action.
PS: I guess all will be well if the end is well. ;-)