Fawkner Highway Patrol police are appealing for witnesses to a collision in Jacana earlier this week.
Emergency services were called to the Western Ring Road near the Pascoe Vale Road overpass about 1.45pm on 19 November after two heavy vehicles collided.
The exact circumstances which lead to the two trucks colliding are yet to be determined but it appears one truck went off the roadway before both vehicles collided.
There were no serious injuries and both drivers are assisting investigators with their enquiries.
Investigators are urging anyone who witnessed the collision, has dash cam footage or any other information that could assist with the investigation to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au.