Accident backs up traffic in Montgomery County

Crews work to clean up an accident on Interstate 81 near Christiansburg.
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MONTGOMERY COUNTY, Va. (WDBJ7) -- An accident is causing delays on Interstate 81 near Christiansburg, according to VDOT.

The accident occurred at mile marker 121 in Montgomery County, near the junction of Route 11 and U.S. 460.

The North left shoulder and left lane are closed. Traffic backups are approximately 4 miles.