OKLAHOMA CITY -- A semi-trailer rolled over on the northbound onramp at Southeast 15th Street and northbound I-35 blocking traffic for part of the evening.

The northbound ramp leading onto I-35 from Southeast 15th Street was closed while crews clean up the scene. However, police said the accident did not affect traffic on I-35.

Police are trying to determine was caused the semi to overturn.

The driver's condition is not known at this time.