Greensborough Highway Patrol are appealing for public assistance as they investigate a hit-run in Eltham this afternoon.
It is understood a white Nissan Patrol collided with a blue Holden station wagon on Main Road about 1.35pm on 25 July.
Officers were told the Nissan was travelling north on Fitzsimons Lane when it failed to navigate a left turn into Main Road and drove over the medium strip and collided into the driver's side door of the Holden.
The driver and only occupant of the Holden, a 34-year-old Fitzroy North man was taken to hospital with serious injuries.
The driver of the Nissan did not stop at the scene and continued travelling along Main Road into oncoming traffic towards Bolton Road.
Late on Thursday evening a man in his 60s from Mernda contacted police in relation to the collision.
He has been taken into custody, interviewed and released pending further enquires
Police still wish to speak to anyone who saw the collision.
Anyone who witnessed the collision, with dashcam/CCTV footage or information is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au