Turnpike absolutely needs a West Carlisle exit near Plainfield for all the warehouses. It should remove some traffic off I-81 between Exits 44-52. Imagine being a truck coming from Pittsburgh to one of the warehouses by PA 465/PA 641. Having to either do all that backtracking around Carlisle now…or taking Exit 201/PA 997 down to PA 696/PA 641 seems like a pain.
Between this and a direct Turnpike/81 connection, it's likely only one will be built any time soon. I think the direct connection is the much bigger need, though I'd love to see a western Carlisle exit connecting to PA 465.
Yes, it would be nice if both sides of I-81 were widened. But I guess we'll take what we can get at this point.
While only southbound has a full widening lined up in the near future, northbound is still being considered for a peak-use left shoulder lane. I'd also prefer a true widening of both directions, but I'll take it.
I'll also note that I drive northbound I-81 into Lebanon County fairly regularly on my commute back from work in the Harrisburg area. I often see southbound in stop-and-go conditions, while northbound remains freely flowing (albeit dense and truck-heavy). This is in the evening
outbound rush, mind you, when you'd expect it to be the other way around.
What's unclear is whether a fourth lane will be added between I-83 and Mountain Road, whether just southbound or in both directions. This is where a third lane was added a few years ago in both directions.