<font face="Verdana, Arial, Helvetica, sans-serif" size="2">Originally posted by DaDOKin DC:
ANohter interesting alternative -- and most complicated -- is to have the I-95 designation flow from the current I-95 south of Wilmington (near Newark DE) and over the Delaware Memorial "Twin" Bridges and onto NJ's I-295. Then keep I-495 and re-number the portion of I-95 through Wilmington and PA and Philadelphia as either 'Business 95' or something like I-895. I'm still wrapping my brain cells around that one.
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The main rationale for that would be to finally "connect" I-95 from end to end. Currently, I-95 breaks off just north of Trenton, and resurrects itself on the NJ Turnpike northbound at I-195. By sending I-95 over the Delaware Memorial, it would be possible to designate the Turnpike as I-95 in its entirety. Because the existing portion of 95 would then become a spur, I believe it would receive an odd 3di - something like I-395 or (my favorite) I-995
(With tax, that'll be $10.55, please.) 
It'll never happen, however - there's a lot of cachet associated with having the nation's busiest interstate flowing through your city, and Philadelphia would never stand for losing it.
But, if you're really interested,
here's far more information on this situation than you'd ever need to know. You're welcome.
Mook