An investigation is underway following a two-car crash that left a man in a critical condition in the Hunter region overnight.
At around 8.30pm yesterday, emergency services were called to the Hunter Expressway, near Seahampton, following reports of a two-car crash.
Officers attached to Hunter Valley Police District attended, along with NSW Ambulance paramedics, Fire and Rescue NSW, the Volunteer Rescue Association, Newcastle Rescue and Transport Management Centre.
Police have been told the two cars collided before hitting the dividing barrier on the expressway.
The driver of one vehicle, a 79-year-old man, was trapped for a short time before he was released and taken to John Hunter Hospital in a critical condition. He is now undergoing surgery.
The driver of the second vehicle, a man aged 30, was taken to John Hunter Hospital for mandatory testing.
A crime scene has been established and the circumstances surrounding the incident will be investigated by officers from the Crash Investigation Unit.
Traffic delays are expected with both eastbound lanes on the Hunter Expressway closed and traffic being diverted onto John Renshaw Drive. Westbound traffic is being diverted into the breakdown lane.
As inquiries continue, police urge anyone with information about the crash, or who may have dashcam footage, to contact police.