Overturned tractor trailer cleanup slowing traffic on Route 55 in Glassboro, New Jersey

Cleanup following a crash involving an overturned tractor trailer in the southbound lanes of Route 55 is slowing traffic in Gloucester County, New Jersey, Monday morning.

The county's emergency management agency said a crash involving the tractor trailer, which was carrying food products, and another vehicle happened just after 4 a.m. near the Ellis Mill Road overpass in Mantua Township.

The southbound lanes were blocked for several hours between the Glassboro and Clayton exits. At 7:45 a.m., officials said one southbound lane had reopened, but traffic is "extremely heavy" in both directions near the scene of the accident.

Drivers were being diverted off the highway onto Ellis Mill Road earlier in the morning. Alternate routes include Aura Road, Delsea Drive, Elk Road, Little Mill Road and Route 322.

Gloucester County Emergency Management said one of the drivers involved in the crash was taken to the hospital, and Gloucester County Hazmat is assisting the fire department with a diesel leak.

This is a developing story and will be updated.