MONTGOMERY COUNTY, Va. – UPDATE 1 p.m.: Both travel lanes are open again. Traffic is backed up three miles.
UPDATE: 12:40 p.m. One lane of traffic is open again. Delays are five miles.
A tractor trailer crash is causing delays on Interstate 81 in Montgomery County.
It happened near mile marker 111, between Christiansburg and Radford.
All southbound lanes are closed.
Traffic is backed up three miles.
Traffic is being detoured off at exit 114.