Traffic on the Sturt Highway has been affected after the crash, which occurred near Carrathool soon before 1.30pm.

Emergency services are at the scene, around 50 kilometres east of Hay, with others still on the way.

It is understood just one vehicle was involved when the B-double rolled on a bend.

A spokesman for NSW Ambulance confirmed paramedics were called to a rollover around three kilometres west of the Carrathool turn-off.

The driver is out of the truck and being treated for shock, paramedics said, and complaints of knee and neck pain.

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There are believed to be no obstructions to the highway, a NSW Police spokeswoman confirmed.

Officers were still en route, she said, and the driver was being assisted by another heavy vehicle driver who stopped at the scene.

NSW Live Traffic is advising traffic is being affected in both directions and travellers are urged to exercise caution and allow extra travel time.

More to come