A wreck has caused multiple highway and ramp closures at the Dallas Junction in downtown Oklahoma City, the Oklahoma Highway Patrol reported. A concrete truck overturned on the ramp from northbound Interstate 35 to westbound Interstate 40, causing the closures, troopers said. Northbound I-35 is closed at I-40, the patrol reported. All traffic is being diverted to eastbound I-40. Also closed is the ramp from westbound I-40 to southbound I-35 and the ramp from eastbound I-40 to northbound Interstate 235, troopers said. A crane has been called in to lift the concrete truck off the ramp, but a patrol dispatcher said it's likely the interchange will be shut down all day.see more on NewsOK.com