An overturned tractor-trailer caused major delays on the northbound New Jersey Turnpike in Cranbury overnight before the crash was cleared and traffic returned to normal.

The crash happened in the truck lanes just south of Exit 8A and possibly involved a second vehicle. There was also a reported truck fire, although it is unclear which vehicle caught fire.

Traffic backed up for miles earlier in the morning as state police responded. Trucks were being directed into the car lanes to get around the crash.

The crash has since been cleared, and both the truck and car lanes are moving smoothly northbound. Southbound traffic is also moving normally.

Construction vehicles remain in the area, but it is unclear whether construction had anything to do with the crash.

State police are investigating. There is no word yet on injuries or what caused the tractor-trailer to overturn.