Emergency services were called to Rifle Range Road just before 7.30am after a collision between a car and pushbike.

The bike rider, a 53-year-old man, was airlifted to John Hunter Hospital with serious injuries.

The man, an off-duty police officer, remains in a critical condition.

The driver was not injured and is helping police with inquiries.

An investigation into the incident is underway and police are appealing for witnesses to come forward.

Police are urging anyone with information to call Crime Stoppers on 1800 333 000 or use the Crime Stoppers online reporting page.