Hm. This extension iot part of PA27 "on paper" per any of numerous PennDOT sources I've found, but it is carried on other state roads.
Which may not mean much. There are other cases in the HB where the "Keystone" route doesn't match the 4-digit SR numbers the route is carried on , such as
PA372 in Buck, or PA61 south of You-Know-Where. Nothing
that I know of past a route's otherwise-end though. *shrug.*
AIUI, there's not always a 1:1 correspondence between the 4-digit SR numbers and PA routes with the keystone shield. Right? (Markkos1992, did I see you say you work for PENNDOT? Any insight here?) Certainly, PA372 isn't signed on Holtwood Rd between HolRd_E and PA272.
Yep, sometimes PA (keystone) routes can have a different 'SR' number. PA-380 is SR-0400 (because SR-0380 is used for I-380), PA-99 has SR-0699 (though used to have SR-0099) because I-99 has SR-0099. There are also a few other examples out there.
This extension is very well signed.
(Another similar case is the west end of ME196.)rickmastfan67, whaddaya think? Add it on in?