One woman has died and a man and a five-year-old boy have been flown to hospital with critical injuries following a serious head-on crash on the South Coast on Thursday afternoon.
Emergency services were called to Matron Porter Drive at Narrawallee about 3.50pm after the cars collided in a 60km/h roadwork zone.
A 36-year-old man who had been driving his silver Subaru west-bound was trapped in the car, suffering multiple fractures and suspected spinal injuries.
His front-seat passenger, a 36-year-old woman, was unable to be revived and died at the scene, police said.
A five-year-old boy in the same car was flown to Sydney Children's Hospital in Randwick with a "critical head wound".
Emergency crews used hydraulic cutters to extract the man from the car, removing pieces of the vehicle including the boot.
He was taken by road ambulance to Shoalhaven Hospital, then airlifted to St George Hospital.
A 39-year-old man driving the other car, a Volvo, was taken to Milton Hospital for observation and mandatory testing.
The road remained closed in both directions on Thursday evening while crash investigators examined the scene.
In a statement, NSW Police said anyone who witnessed the crash should come forward.
Judy Brown, who arrived at the scene shortly after the crash, said it was a "sweeping bend".
"At the moment it's only 60 km/h but it's normally 80 km/h which is probably a bit too fast," she said. "You just hope that they're all going to be okay."
Another passer-by was Lisa Elmas, who previously pulled two women out of a car that later burst into flames in a horrific head-on South Coast crash on Boxing Day.
Lars Falkholt and his wife Vivienne died in the crash. Their youngest daughter Annabelle, 21, died several days later, while their eldest daughter Jessica Falkholt remained in hospital two weeks after the crash.
Ms Elmas stayed with the driver of the other car as he passed away, then helped to cut the seatbelts of the sisters and pull them to safety.
She told the Illawarra Mercury she was approaching the Narrawallee crash site on Thursday when she realised what she was seeing, and – knowing there were others already assisting the injured - turned her car around.
"It was too much for me. I turned around after the police overtook me," she said. "It's too soon."
In the aftermath of the Boxing Day tragedy, Ms Elmas has called for first aid kits and fire extinguishers to be made mandatory in all vehicles.