Interstate 72 is a rather short highway connecting Cambridge, OH to Pittsburgh, PA.  (I would've extended it all the way to the Pennsylvania Turnpike via I-279 and I-376, but then I just realized that they're building I-576 as a link between the Pittsburgh airport and I-376.  I feel that it's very important for I-576 to stay connected to I-376, and I-376 to I-76.)
I-77 (Parkersburg/Charleston/Charlotte)(Canton/Akron/Cleveland)
Center
OH 513/Winterset
Londonderry
OH 800/Smyrna
OH 331/Piedmont
Moorefield
OH 519 (Deersville/New Athens)
US 250 (Wheeling/New Philadelphia)
OH 9 (Cadiz/Jewett)
East Cadiz
OH 151 West/Jewett
OH 151 East/Hopedale
Jewett
OH 152/Richmond
Unionport
OH 43/OH 646 (Richmond/Steubenville)
OH 7 North (East Liverpool/Youngstown)
OH 7 South (Steubenville/Wheeling)
TO WV 2/Weirton
PA 18 (New Castle/Washington)
Bavington
PA 980/Candor
Tyre
Kelso Road
US 30/PA 978 (East Liverpool/Oakdale)
Mahoney Road/Oakdale Road
McKee Road
Steubenville Pike
PA 60/Pittsburgh International Airport
Ridge Road/Campbells Run Road
I-79 (Erie/Washington)/I-279 North (Pittsburgh)
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