South Illinois Avenue to re-open by midnight Posted at South Illinois Avenue is expected to re-open by midnight Sunday, Jan. 24, 2021, near the University of Tennessee Arboretum after being closed for more than two days because of a large high-voltage transmission tower that was knocked over in a crash on Friday. The repair work is pictured above on Sunday. (Photo courtesy City of Oak Ridge) South Illinois Avenue is expected to re-open by midnight near the University of Tennessee Arboretum after being closed for more than two days because a large high-voltage transmission tower was knocked over near the road in a crash on Friday. The road re-opening is expected to occur before the Monday morning commute.