ROCKBRIDGE CO., Va. -

UPDATE: The tractor-trailer wreck is cleared.

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A tractor-trailer wreck on Interstate 81 is causing major delays in Rockbridge County on Wednesday morning.

The southbound lanes are now open around mile marker 202, which is near Hillcrest View Road.

Traffic is backed up one mile, as of 9 a.m.

The wreck happened around 4 a.m.

Check back for updates.