Police, NSW Fire and Rescue and NSW Ambulance personnel are at the scene.

A male, believed to be aged in his mid-60s, has suffered a serious head injury.

Initial reports indicate emergency services were responding to an incident involving a truck and a pedestrian.

Traffic is being diverted through Forest Hill, along Elizabeth Avenue, Inglewood Road and Bakers Lane to rejoin the Sturt Highway at Gumly.

More to come.