What is Interstate 81?
{{Infobox road |country=USA |route=81 |type=I |length_mi=854.89 |length_ref=<ref name=fhwa>{{cite web|url=http://www.fhwa.dot.gov/reports/routefinder/table1.htm|title=FHWA Route Log and Finder List: Table 1|date=2002-10-31|accessdate=2007-03-28|author=Federal Highway Administration}}</ref> |length_round=0 |direction_a=South |direction_b=North |terminus_a={{jct|state=TN|I|40}} in [[Dandridge, Tennessee|Dandridge, TN]] |terminus_b={{jct|state=ON|Hwy|137}} at [[Thousand Islands Bridge]] in [[Wellesley Island|Wellesley Island, NY/ON]]<br> (<small>TO</small> {{jct|state=ON|Hwy|401}}) |junction=<!-- Major junctions only; Only 5-8 most major intersections and cities belong here; please read [[WP:USRD/STDS]] for more info --> {{jct|state=TN|I|26|US|23}} near [[Kingsport, Tennessee|Kingsport, TN]]<br /> {{jct|state=VA|I|77}} near [[Wytheville, Virginia|Wytheville, VA]]<br /> {{jct|state=VA|I|64}} from [[Lexington, Virginia|Lexington, VA]] to [[Staunton, Virginia|Staunton, VA]]<br /> {{jct|state=MD|I|70}} at [[Hagerstown, Maryland|Hagerstown, MD]]<br /> {{jct|state=PA|I|76|PATP}} at [[Carlisle, Pennsylvania|Carlisle, PA]]<br /> {{jct|state=PA|I|78}} at [[Union Township, Pennsylvania|Union Township, PA]]<br /> {{jct|state=PA|I|80}} near [[Hazleton, Pennsylvania|Hazleton, PA]]<br /> {{jct|state=PA|I|84}} near [[Scranton, Pennsylvania|Scranton, PA]]<br /> [[Image:Future plate blue.svg|20px|link=]]<br />{{jct|state=NY|I|86|NY|17}} in [[Binghamton, New York|Binghamton, NY]]<br />{{jct|state=NY|I|90|NYST}} in [[Syracuse, New York|Syracuse, NY]] }} '''Interstate 81''' is a north-south [[interstate]] in the eastern [[United States]]. It runs from [[Dandridge]], [[Tennessee]] in the south to [[Wellesley Island]], [[New York (state)|New York]] in the north; for a total distance for about {{convert|854.89|mi|km}}.<ref name=fhwa/> It follows the [[Appalachian Mountains]] for nearly its entire length.<ref>{{cite web|url=http://www.interstate-guide.com/i-081.html|title=Interstate 81|publisher=Interstate Guide|accessdate=2009-03-31|arch