ROANOKE CO., Va. -

The tractor-trailer wreck is cleared, according to the Virginia Department of Transportation.

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A Roanoke County tractor-trailer wreck is causing major backups on Interstate 81.

The southbound left lane and shoulder are blocked near mile marker 136. That's about a mile south of Wildwood Road.

As of 8:40 a.m., traffic is backed up about five miles.

Check back for updates.

I-81 South backup