Investigators have been told the male rider was travelling north along Colac-Ballarat Road on Wednesday morning and attempted to overtake a car on the single carriageway.

As he was doing so, the vehicle in front of the car being overtaken, which was towing a caravan, began making a right-hand turn into a driveway.

The motorcyclist collided with the turning vehicle.

The man, who is yet to be formally identified, died at the ​accident ​scene.

No one else was injured during the collision.

Colac-Ballarat Road ​was closed between Ryans Road and Ondit-Warrion Road.

Police will prepare a report for the Coroner.

Anyone who witnessed the collision is urged to contact Crime Stoppers on 1800 333 000 or submit a confidential report online at www.crimestoppersvic.com.au

There have been 66 lives lost on Victorian roads this year compared with 83 at the same time last year.