State roads at your state's borders - how many keep the number across the line?

[dgolub]

Nope.  PA does not duplicate interstate and state routes unless created by a renumbering.  PA has I-90 (yes, it's almost 400 miles away, but it's there).

Thanks for pointing that out. On Google Maps the 90 number is still there for the PA section of the road but there is not a real PA-90 route there. 

The bridge is signed as NJ 90 on the Pennsylvania side, but New Jersey considers the state route to end at the state line.

[roadman65]

NJ's borders:

NJ-NY:

Roads that do: 495, 440, 17, 94, 284
Roads that do not: NY-340 (road continues as a country route), NY-303, NY-304, NY-45, NY-210, NJ-23

NJ-PA:

Roads that do: 179, 413, 73, 90
Roads that do not: The other end of NJ-94  , PA-263, PA-532*

*PA-532 ends a little before the bridge to NJ but still very close to the border*

So it seems like NJ is generally even with roads that do and roads that do not cross the border. This was quite interesting to do! 

I believe once upon a time NJ and DE had a multistate Route which has none across its two border crossings. 

NJ 48 that ends at US 130 in Penns Grove used to connect via a ferry no longer in service to DE 48.

Plus PA 100 used to continue south of West Chester, PA and end at DE 100.
MD 299 used to connect with DE 299.
US 301 used to be MD 71 and DE 71.  That's why DE 71 once had a useless overlap with US 301 up to the state line before DE 896 was rerouted to Boyd's Corner. DE 71 south of Middletown is old 896.