Traffic Alert: Pothole Causing Delays
Traffic is backing up on Interstate 81 northbound in Smyth County.
Virginia State Police says a pothole or sinkhole developed in the left hand lane near mile marker 40.
Troopers are working emergency officials described as a "significant" number of crashes.
The Virginia Department of Transportation says online the left shoulder and left travel lane are closed.
An emergency road repair is under way.