What is Interstate 77?
{{Infobox road |country=USA |route=77 |type=I |direction_a=South |direction_b=North |length_mi=610.1 |length_round=2 |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> |established= |terminus_a={{Jct|state=SC|I|26|US|21|US|176|US|321}} near [[Columbia, South Carolina|Columbia, SC]] |terminus_b={{Jct|state=OH|I|90}} in [[Cleveland|Cleveland, OH]] |junction={{Jct|state=SC|I|20}} near [[Columbia, South Carolina|Columbia, SC]]<br>{{Jct|state=NC|I|85}} in [[Charlotte, North Carolina|Charlotte, NC]]<br>{{Jct|state=NC|I|40}} in [[Statesville, North Carolina|Statesville, NC]]<br>{{Jct|state=NC|I|74}} near [[Mount Airy, North Carolina|Mt. Airy, NC]]<br>{{Jct|state=VA|I|81}} near [[Wytheville, Virginia|Wytheville, VA]]<br>{{Jct|state=WV|I|64}} near [[Beckley, West Virginia|Beckley, WV]]<br>{{Jct|state=OH|I|70}} in [[Cambridge, Ohio|Cambridge, OH]]<br>{{Jct|state=OH|I|80|OHTP}} in [[Richfield, Ohio|Richfield, OH]] }} '''Interstate 77''' is an [[Interstate Highway]] in the eastern [[United States]]. It goes from [[Columbia, South Carolina]] north to [[Cleveland, Ohio]]. The route is {{convert|610.10|mi|km}} long.<ref name=fhwa/> It traverses diverse terrain, from the mountainous state of [[West Virginia]] to the rolling farmlands of [[North Carolina]] and [[Ohio]]. It mostly replaces the old [[U.S. Route 21]] between [[Cleveland, Ohio]], and [[Columbia, South Carolina]], as an important north–south corridor through the middle [[Appalachian Mountains|Appalachians]]. The southern terminus of Interstate 77 is in Columbia at the junction with [[Interstate 26]]. The northern terminus is in Cleveland at the junction with [[Interstate 90]]. The [[East River Mountain Tunnel]], connecting [[Virginia]] and West Virginia, is one of only two instances in the United States where a mountain ''road'' tunnel crosses a state line. The other is the [[Cumberland Gap Tun