OKLAHOMA CITY - An overturned semi shut down the exit ramp from southbound Interstate 44 to westbound Interstate 40 for roughly four hours on Tuesday.

The Oklahoma Highway Patrol closed the exit ramp shortly after 11 a.m. It was re-opened at approximately 3 p.m.

The driver and a passenger inside of the semi were transported to a local hospital. Their conditions are not known at this time. 

The cause of the crash has not been determined.