It would be great to see I-81 at six lanes all the way from I-77 to I-84
Honestly, I think I-78 should be six-laned over to Allentown before 81 is widened north from 78. From I-80 north to Scranton, though, could really use it.
Fortunately, there is also a
project to widen I-81 in Luzerne County through the Wilkes-Barre area. This one is actually supposed to go to construction in the next few years, and will probably be the first "proper" widening (i.e. through multiple interchanges, not just a glorified auxiliary lane) of 81 in the state.