The Iowa State Patrol investigated a two vehicle accident involving two semi tractor trailers Friday evening on Interstate 80 in Adair County. Officials say both 33 year old Dong Liu of California and 64 year old Vlado Topalovic of Ohio were traveling west on Interstate 80 in the outside lane and Liu collided with the rear of the Topalovic trailer. After striking the vehicle Liu went onto the north shoulder and struck the barrier cable system while the Topalovic vehicle came to a stop in the outside lane. Topalovic was not injured but Liu was taken to Cass County Memorial Hospital in Atlantic for treatment of injuries.