Two large wreckers upright a tractor-trailer rig that rolled on its side about 3 a.m. Sunday morning blocking the southbound lanes of I-35 south of Tecumseh Road. Workers were able to open one lane and then spent several hours unloaind the cargo and loading it into another trailer. The wreckage was cleared about 2 p.m. The Oklahoma Highway Patrol is investigating the accident. Jerry Laizure/The Transcript