8.50am: It is understood that both lanes have been reopened
8.40am: The woman is being treated for minor neck injuries. At this stage it is not known if she will be taken to hospital.
8.38am: Ambulance officers are on scene and treating one woman by the roadside. It is believed her injuries are not serious.
8.35am: One lane northbound remains open and traffic is moving around the accident site through that lane.
8.34am: Northbound traffic is heavy, with vehicles backed up to Yallah Road.
8.22am: A multi-vehicle crash on the motorway at Yallah is causing headaches for peak-hour traffic.
The accident, which involved as many as four cars, happened at 8.20am on the northbound side of the M1 Princes Motorway.
The accident site is north of the Dapto exit.
More to come