The woman's four-wheel drive rolled in the accident with two other vehicles around 12.10pm about 500m south of Silos Estate Winery.

Northbound lanes are affected.

While the mother and child appear uninjured they are being transported to the hospital for further assessment.

It has been reported the child was properly secured in appropriate seating at the time of the crash.

The two other male drivers are also out of their vehicles and being assessed by NSW Ambulance paramedics.

Other emergency services vehicles are on the scene.

Traffic is affected in both directions and is very heavy.

Alternating (stop/slow) traffic conditions are in place. Allow extra travel time.

Please take care.