As of 1:07 p.m., traffic is now clear.
A tractor-trailer crash has caused a 3.5-mile backup on I-81 North in Roanoke County, according to VDOT.
Authorities said the accident happened near mile marker 142.
As of 7:43 a.m., the northbound right lane and right shoulder are closed.
Stick with 10 News as this breaking news story develops.
Source: WSLS News 10