MONTGOMERY COUNTY, Va. – UPDATE
This crash has been cleared.
As of 11:30 a.m., traffic is backed up for about two miles.
As of 10:25 a.m., traffic is backed up for about six miles.
A crash is causing a backup in Montgomery County on I-81 North, according to VDOT.
Authorities said the accident happened near mile marker 128.
As of 9:20 a.m., the northbound left shoulder and left lane are closed.
Stick with 10 News for more updates as this breaking news story develops.