My parents are from Lancaster County. The road planning folks had zero future thoughts of population growth. In the early 2000s, Rt 30 underwent a complete redo in the area closest to Lancaster City. Balfour Beatty fucked it up badly and was kicked off (paraphrasing that part).

Fun anecdote about the Pennsylvania Autobahn (Rt 222)....

When that part of 222 was brand new my mom got lost on it. We had been living in California, where my father was posted in the Army, and had come home to visit family. The highway portion being brand new caught my mom off guard, and we ended up in the Reading area and not going towards Millersville. Basically, we arrived late due to taking the scenic route. 😂😂 My mother's version of "oopsy" was something like, "Well, that was interesting."