The accident happened at 3:37 a.m. at milepost 19.7 in West Deptford, Gloucester County.
Police say the driver of the tractor-trailer was attempting to pass the dump truck when the rig clipped the rear of the dump truck.
The collision caused the tractor-trailer to jack-knife and sent the dump truck off the roadway and into a tree 50 feet into a wooded area.
The driver of the dump truck became trapped inside the vehicle and needed to be extricated by rescuers.
The driver of the tractor-trailer, 60-year-old Vico Bertogli of Toughkenamon, Pennsylvania, was not seriously hurt and refused treatment at the scene. The driver of the dump truck, 53-year-old Lloyd Hartsell of Monroeville, New Jersey, was transported to Cooper University Medical Center by helicopter for treatment of injuries deemed to be not life-threatening.
The southbound lanes were closed for approximately three hours, from Exit 4 (Route 73) to Exit 2 (Route 322). However, traffic has since reopened.