ROCKBRIDGE COUNTY, Va. (WDBJ) - Traffic is backed up on I-81 in Rockbridge County Thursday evening.

A big rig crash at mile marker 181 led to the closure of all northbound lanes, according to VDOT .

The southbound left shoulder and left lane were also closed as of 8 p.m.

No information has yet been released about any injuries or the cause of the crash.

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