 The road heads back into Allentown and runs near residential areas, passing south of Allentown Queen City Municipal Airport before it comes to the Lehigh Street exit.I-78/PA 309 runs near industrial areas and passes over Norfolk Southern's Reading Line before coming to a westbound exit ramp serving Emaus Avenue.The freeway passes near neighborhoods before it leaves Allentown for Salisbury Township, where it ascends forested South Mountain.