Emergency crews were called to the scene, about 10 kilometres south of Hillston, about 4.22am.

Upon arrival the man's vehicle was found in a ditch on the side of the road and his body was discovered nearby.

NSW Ambulance's MIA duty operations manager Markus Zarins said there were no other occupants in the vehicle.

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"The vehicle had obviously sustained damage of having rolled over a couple of times," he said.

"The vehicle was in a ditch on the wrong side of the road.

"Eventually one deceased male was located a short distance from the vehicle."

Mr Zarins said the scene was discovered and reported by a truck driver travelling along the road.

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Investigations into the circumstances of the crash are ongoing.