On I-81 at mile marker 196.1 in the County of Rockbridge, motorists can expect delays due to a tractor trailer accident. The North left shoulder and left lane are closed. All South lanes are closed. Traffic backups are approximately 3.0 miles.Traffic is being detoured off of I-81 Southbound exit 200, onto Route 710, onto US-11, back onto I-81 Southbound at mile marker 195.