Police are looking into whether speed, fatigue or impaired driving were factors in a single-vehicle fatal accident near Ellerslie on Thursday.

Acting Sergeant Jason Barker, of the Warrnambool police highway patrol unit, requested that anyone who saw the vehicle on the north side of the Hopkins Highway, between Red Lane and Hexham-Ballangeich Road, contact police.

He said it's believed the accident happened between noon and 2pm involving the silver Toyota HiLux utility.

The accident site is about four kilometres south of the Hopkins River bridge at Ellerslie.

The ute was travelling south towards Purnim and Warrnambool when the driver has crossed the highway, gone off the road and the utility rolled a number of times.

It was a straight stretch of road.

"We are requesting that anyone who was travelling on the highway at that time with dash camera footage provide that footage to us," Acting Sergeant Barker said.

"We will be ascertaining whether speed, fatigue or impaired driver are factors in the collision," he said.

Earlier: Police are investigating when and how a fatal single-vehicle accident happened, which was discovered in Ellerslie on Thursday afternoon

Emergency services were called to Hopkins Highway following reports a Toyota utility had rolled into a tree about 2.15pm on Thursday.

A police spokeswoman said a silver Toyota HiLux rolled down an embankment before hitting a tree beside the road.

The driver, a 24-year-old Traralgon woman, died at the accident scene south of Mortlake.

It is not known what time the accident happened and police are investigating all the circumstances surrounding the tragedy.

Investigators are appealing for anyone who witnessed the crash, saw the vehicle earlier in the day or has dashcam footage to come forward.

Anyone with information that could assist police is urged to contact Crime Stoppers on 1800 333 000 or submit a report online at www.crimestoppersvic.com.au.

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