MIDWEST CITY, Oklahoma - Traffic is flowing again on Interstate 40 westbound after a semi crashed and spilled diesel fuel across the road.

The crash happened just before 2:30 a.m. at I-40 and S.E. 29th Street when the tractor-trailer jackknifed and crashed through a concrete barrier.

The Oklahoma Highway Patrol shut down the interstate between S.E. 29th and Air Depot in Midwest City for more than three hours while they cleaned up the wreckage and fuel spill.

The semi driver was not hurt. It's not known yet what caused the crash.