Two men have been killed in a head-on collision on a major highway during the afternoon peak hour.
Emergency services were called to a stretch of the Great Western Highway between Linden and Faulconbridge in the Blue Mountains west of Sydney at about 5.20pm Wednesday following a collision between a Toyota Camry and Polestar.
The driver of the Toyota and a backseat passenger in the Polestar died at the scene.
The men are yet to be formally identified.
A NSW Ambulance told Daily Mail Australia the driver and front occupant of the Polestar were a woman and man, who were treated for multiple injuries at the scene.
They were taken to Sydney’s Westmead Hospital in a serious but stable condition, the spokesperson said, with the woman transported by helicopter.
Two rescue helicopters were deployed to the scene, along with and multiple intensive and critical care paramedics and doctors.
A crime scene has been established as police launched an investigation into the circumstances of the crash.

Two men were killed after a head-on collision between two cars on The Great Western Highway near Linden on Wednesday night

NSW Police closed the busy Great Western Highway in both directions for more than hour on Wednesday night
The crash sparked traffic chaos with the Great Western Highway closed in both directions at Linden for at least 90 minutes.
Footage showed queues of vehicles snaking back for kilometres as emergency services cleared the scene.
‘Avoid the area, consider delaying your trip,’ a traffic alert stated.
One lane of the highway was opened under stop/slow traffic control shortly before 7pm to allow vehicles to pass the crash site in both directions.
Drivers have been urged to expect delays, allow extra travel time and exercise caution.

A man and woman were also transported to hospital with multiple injuries

It was a nightmare commute home for Blue Mountains motorists
‘Ongoing police investigations are expected to take some time,’ an updated alert read.
‘Motorists travelling between Sydney and Lithgow can consider using Bells Line of Rd instead.’
Anyone who may have witnessed the incident or has dash cam or CCTV is urged to contact Crime Stoppers.