Three people have died and another is in a critical condition after a head-on collision on a highway in the NSW Hunter region.
Four people were trapped when a ute and car collided on the Golden Highway at Jerrys Plains on Sunday afternoon, but emergency services were only able to free a 50-year-old woman from the ute.
She was airlifted to John Hunter Hospital and remains in a critical condition with leg, chest and abdominal injuries.
Two men, aged in their late 30s who were in the car and a man travelling in the ute died at the scene.
While rushing to the scene, an ambulance crashed and rolled over.
The uninjured paramedics were picked up by police.
The Golden Highway was closed for several hours, but reopened at 10pm on Sunday.
"All diversions have been lifted and there are no delays for motorists in the area," the Transport Management Centre said in a statement.
In Sydney, crash investigators are appealing for anyone who witnessed a man being hit by a truck as he tried to cross the busy M7 motorway at Bella Vista to come forward.
The 59-year-old suffered head, chest, arm and leg injuries when he was struck about 11.30am on Sunday. He is now in Westmead Hospital in an induced coma.
Police have been told the truck driver braked but couldn't avoid hitting the man.
Meanwhile, a woman hit by a car on her way home from a Sydney dance party last week has died in hospital.
Police say the 24-year-old was hit by a Toyota about 5am last Saturday on Showground Road, Homebush, just after she left a nearby party.
She was taken to Westmead Hospital but died about 11pm on Saturday.
The car's 20-year-old driver was not injured.
"It's believed a number of people were leaving the dance party at the time and may be able to clarify the circumstances surrounding the incident," police said in a statement on Sunday.