UPDATE: An accident that has created lengthy northbound backs this afternoon on Interstate 81 is now cleared, but those backups by and large have not. The accident had blocked one lane right at the I-581 interchange, and while both lanes are now open there, VDOT traffic cams show slowdowns still begin at least 10 miles back before you reach Wildwood Road.

PREVIOUS: An accident involving a tractor-trailer is creating lengthy northbound backups on Interstate 81 in Roanoke County. The accident occurred at milemarker 143, right at the I-581 interchange. One lane is getting by to the right, but VDOT traffic cameras show backups extending nine miles to milemarker 134.

Check back for updates.