I was pondering whether "local" non-interstate Interstates whose
numbers are used elsewhere would qualify.

For example, I-495 is also the Capitol Beltway (around Washington DC).
Different road, same number.

In this area (DC metro) we also have I-97 (complete in Maryland). I-270
(also in Maryland), I-66 (completely in Virginia). I-895 (Harbor Tunnel
in Baltimore), I-295 (In DC) I-795 (Northwest Extension in Baltimore)
and I_695 (Baltimore Beltway) I'm sure some of these numbers are used
elsewhere.

On Friday, July 25, 2003, at 01:06  PM, Dan Barrett wrote:

> Here in Mass, 190 and 290 run entirely within the Commonwealth, IIRC.
> 495 is the same story, yes?  It's the outer ring road around Boston,
> never
> crosses the border.  Same thing outside NYC.