Tractor-trailer accident causing traffic backup on Interstate 81

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WYTHE COUNTY, Va. (WDBJ7) -- Motorists traveling on Interstate 81 in Wythe County can expect delays due to a tractor-trailer accident.

According to VDOT, the accident happened at mile marker 83.

At this time all north bound lanes are closed and traffic backups currently are at 3.5 miles.

Stay with WDBJ7 for any updates.