A man has died following a single vehicle crash on the M1 Pacific Motorway at Cooranbong.

Police say around 1.20am on Wednesday emergency services were called to a single vehicle crash in the southbound lanes between Cessnock Road and Freemans Drive.

The male driver died at the scene and he is yet to be formally identified.

A crime scene has been established as investigations continue into the circumstances leading up to the crash.

Anyone with dashcam footage which could assist investigators is urged to contact Crime Stoppers on 1800 333 000.