Westgate Highway Patrol members are appealing for witnesses after a 29-year-old was located deceased in his car following a crash in Werribee on Tuesday night.
The Tarneit man was driving along Hoppers Lane when his 2008 black BMW left the road and crashed into a number of street signs before coming to a stop near the Princes Highway about 10.40pm.
Despite the efforts of witnesses and emergency services, the man could not be revived.
Police will prepare a report for the coroner.
Westgate Highway Patrol members would like to speak to any witnesses that have not already spoken with authorities or anyone with dashcam or CCTV footage.