Pennsylvania Roads - PA 378

PA 378

PA 378 was I-378, hence the number, until PennDOT figured out that US 22 would never make it as an Interstate (and New Jersey wasn't too keen on upgrading its section to a freeway). For a little while, I-378 was dangling well north of the new I-78 routing, before it was downgraded in 1971 and extended along the southern part of PA 191 to PA 309. Thanks to Scott Colbert, who gave me a pretty good signage run in both directions for this page before I was able to get my own.


The more I look, the more of these there are. PA 378 NB at Broadway in Bethlehem, just before meeting PA 412.


Beyond the end of the old I-378, which is where the median vanishes into double yellow lines; PA 191 would have been going straight once upon a time (hence the shield).


And here, the NB assemblies toward the Bethlehem side of the bridge, where the currently closed exit crosses the Moravian Restoration Area and the old Interstate began. Notice by looking closely that the "Main St." and the arrows were lower on the signs. There were once PA 191 shields above the text on these signs; Main St. was part of the dance over to Linden St., which now becomes 191 upon reaching US 22.


A look at what somehow passed for an Interstate, with a very narrow grass median, almost no left shoulders, and no guiderail. This is reminiscent of the Arroyo Seco Parkway, California's first freeway.


NB toward Exit 2, the only numbered exit on the NB side (though the equivalent of Exit 1 appears after merging with a US 22 EB C-D road). The PA 378 freeway is numbered from its onetime parent, but I don't know if mileposts still run north-south or if they were reversed with the redesignation and southward extension. In fact, I didn't see any mileposts there at all. Question: Why is Eighth Ave. NORTH Exit 2E?


Speaking of Eighth Avenue North, these are on it.


And these are SB.


A SB run of all three numbered exits. Yes, exits increase away from the parent, meaning they counterintuitively increase to the south. I-180 increases to the west, anti-MUTCD as well (though it was once north-south so it didn't seem so out-of-place then).


Broad St. WB at 3rd Ave. in Bethlehem, courtesy Anthony Simon. It's difficult to reverse a route shield, but looking at the attendant street sign, I guess none of the inspectors were paying attention after the product was installed.


NB, the end of PA 378. I don't know why the EAST BGS's are darker than the WESTs, but it appears to be more than just lighting.

Onto US 22
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