Editing Interstate 77 (section)

===Virginia===
{{Main|Interstate 77 in Virginia}}
[[File:I77NCline.jpg|thumb|right|250px|I-77 entering North Carolina from Virginia]]
I-77 through Virginia passes through two tunnels: the [[Big Walker Mountain Tunnel|Big Walker]] and [[East River Mountain Tunnel|East River]] mountain tunnels. For {{Convert|8|mi|km|spell=in}}, I-77 and [[Interstate 81|I-81]] overlap near [[Wytheville, Virginia|Wytheville]]. This is a [[wrong-way concurrency]], where two roads run concurrent with each other but are designated in opposite directions. For its entire length in Virginia, I-77 is either parallel to or [[Concurrency (road)|concurrent]] with [[U.S. Route 52|US&nbsp;52]]. It will have a concurrency with [[Interstate 74|I-74]] throughout the state. 

On March 31, 2013, there was a nearly 100-car pileup on I-77 near [[Fancy Gap, Virginia|Fancy Gap]]; as a result of that crash, electronic variable speed limit signs are now in place along that stretch of I-77. The speed limit can be adjusted according to driving conditions at any given time.