4.15pm: The accident has been cleared and traffic in the area is returning to normal.
4pm: Traffic is heavy on the M1 Princes Motorway at Berkeley after a single-car rollover on Monday afternoon.
The accident happened southbound on the motorway, just past Five Islands Road, about 3.50pm.
Emergency services are on the scene and the NSW Transport Management Centre says motorists should expect delays.
Initial reports suggest one person in the car managed to get themself out of the vehicle.