Emergency services responded to reports of a truck crash along the Mid Western Highway, around 20 kilometres west of West Wyalong near Pfeiffers Lane, at 4.40am on Saturday.

Upon arrival, they discovered a semi-trailer in a dry creek bed off the side of the road.

Investigators believe the truck left the road and struck a guard rail before coming to land in the dry waterway.

A man, believed to be 43, died at the scene and is yet to be formally identified.

A crime scene was established and examined by specialist forensic officers. A report will be prepared for the coroner.

The highway remains closed in both directions west of West Wyalong, with diversions in place.

Drivers are urged to exercise caution and allow extra travel time for the detour, which sends drivers along the Newell Highway, Burley Griffin Way and Kidman Way to travel between West Wyalong and Goolgowi.

The latest road updates can be found at Live Traffic NSW.

Anyone with information about the crash is urged to contact Crime Stoppers by calling 1800 333 000 visiting the online reporting page.

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