Police are seeking dashcam footage following an incident on Burwood Highway in Ferntree Gully on Sunday 2 July.
At about 3pm, a 37-year-old male driver of a Honda convertible lost control of his vehicle and collided with a sign pole on Burwood Highway near Dorset Road.
The driver was uninjured and is assisting police with their enquiries.
A male passenger was trapped in the vehicle until freed by emergency services and later conveyed to hospital with the extent of his injuries unknown at the time of reporting.
Police are seeking any dashcam of the collision or of the distinctive black Honda driving in the area prior.
If you can help, please make a confidential report via Crimestoppers and quote reference number T20230015322 or go online to crimestoppersvic.com.au/report-a-crime/