The 50-year-old male rider, who it is understood does not come from the local area, was riding with a group of friends when the accident happened on the eastern side of Braidwood Road near the intersection of Parma Road.

It is believed the man's trail bike left the roadway and struck a traffic sign poll just before 3pm.

NSW Ambulance paramedics attended the scene and treated the man for close to an hour.

The Toll Ambulance Rescue Helicopter was called to the area but unfortunately, despite paramedics efforts, the man passed away at the scene.

A crime scene has been established and investigations are underway into the cause of the accident.