UPDATE 5:28 p.m.: Several hours after VDOT announced that crews cleared the scene of Thursday’s tractor-trailer crash on I-81 South, traffic has finally resumed its regular flow.

ROANOKE COUNTY, Va. (WFXR) — Southbound motorists are backed up for miles along I-81 in Roanoke County because of a tractor-trailer crash.

According to the Virginia Department of Transportation (VDOT), the left shoulder and left lane are closed at mile marker 138.7 on I-81 South.

As of this writing, traffic is delayed for about four miles along the interstate, VDOT says.

This is a developing story.