A 27-year-old woman and an eight-year-old boy she was a carer for have died after being hit by a truck on the Pacific Motorway near Newcastle in New South Wales.
Police said the woman's car had stopped in a breakdown bay on the M1 at Cameron Park, near George Booth Drive, on Sunday evening.
"The driver got out of the vehicle and opened the side door," Acting Assistant Commissioner Stuart Smith said.
"At that stage we believe an eight-year-old child has entered the roadway, followed by a 27-year-old carer.