An accident involving a tractor trailer caused traffic delays on Interstate 81 in Roanoke County Friday night.

The wreck happened around 7:45 in the northbound lanes of the interstate, near exit 141.

State Police say a 1999 Nissan was traveling northbound in the right lane when it was hit by a 2007 Mack tractor trailer which was attempting to change lanes.

The Nissan then spun around, hit a guard rail, and was hit by the tractor trailer again.

The driver of the Nissan, Rachel Ely of Salem, was not hurt.

The driver of the R & L Transport tractor trailer, Bud Duncan of Troutville, was charged with making an improper lane change.

The left lane was closed for an hour due to the crash.

There was also a second wreck involving three vehicles that occurred in the same area as the first crash.

No one was hurt in the second wreck.