About 3.45pm, emergency services were called to Hopkins Falls Road.

Warrnambool police South-west police road safety adviser Senior Sergeant Matt Wheeler said the truck made a slight left turn at the bend of the road before it rolled.

"It was carrying hay bales - and for reasons still under investigation - the vehicle has left the road and rolled into a paddock," he said.

He said the 47-year-old male driver from Warrnambool was injured and taken to hospital

"The cause is still under investigation," Senior Sergeant Wheeler said.

His message to drivers was to ensure they were driving at a speed and manner that fitted the conditions they're driving in.

"Pay particular attention and avoid any distractions and take care to get to their destiantion safely," Senior Sergeant Wheeler said.

EARLIER: THURSDAY:

A Country Fire Authority (CFA) spokeswoman said crews were called to a hay truck rollover on Hopkins Falls Road about 3.45pm.

Detours are still in place.

A CFA spokeswoman said the driver was extricated from the vehicle.

The State Emergency Service and Fire Rescue Victoria is also on the scene.

Ambulance Victoria said one person was treated by paramedics at the scene before he was taken to hospital by road ambulance.

It comes after emergency services attended a single vehicle rollover on Wangoom Road in Warrnambool around noon.

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