VicRoads says it is still assessing whether the Western Highway needs further repairs, after a fatal truck and bus crash near Pimpinio also on Thursday.

A van rolled onto its roof on Blue Ribbon Road, between Banyena Road and the speedway at Kalkee, just before 3pm.

The male driver, a 29-year-old Chinese national, was not injured. Police say the cause of the crash is still under investigation.

The road was being used as a diversion route at the time. VicRoads closed the highway in both directions between Pimpinio and Horsham due to a fatal crash involving a truck and bus.

On Friday, a Victoria Police spokeswoman said the cause of the crash was still under investigation.

Cereal and legume farmer Glenn Jenkinson has lived all his life at Kalkee, five kilometres south of the accident site. He said he had noticed the road shoulders deteriorate significantly in the past 10 years.

"Those shoulders are not being repaired to the standard they should be," he said.

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"We have school children using that road on the school bus, and the safety of those shoulders concerns us hugely for when the bus has to share the road with oncoming traffic and oversize vehicles using the road all the time.

"It's a bit of a joke because the roads were painted with white lines two weeks ago, and at the edges the gravel has been painted because the bitumen has been chipped away. Authorities in charge of that road need to act and repair it. Why do we have to wait for an accident to happen to get things done?"

Victorian Farmers Federation Horsham branch past president Tom Blair agreed the road's edges were getting "wrecked".

A cereal and sheep farmer in the area for 50 years, he said diversions such as the ones that took place on Thursday were happening "more frequently than we would like".

"Traffic has to be diverted onto Blue Ribbon Road after any serious incident at Wail or Pimpinio, and sometimes they suggest people use Old Minyip Road," he said.

"The edges need to be graded up. It's been like this for a bloody long time and no one really knows who is to blame."

Mr Blair said he hoped road quality would be discussed at the VFF's September meeting.

Horsham Highway Patrol say inquiries into the van rollover were ongoing, with police looking into whether speed and road conditions played a role.

A Victoria Police spokeswoman said people with information could contact Crime Stoppers on 1800 333 000.

A Regional Roads Victoria spokeswoman acknowledged there had been some increased wear on Blue Ribbon Road because of its use as a detour route.

"We are currently assessing its maintenance needs and will continue to monitor the road's condition. We don't expect any major delays in relation to repairs and will ensure the roads are still useable during this time," she said.

Patching and asphalt repairs have been undertaken on the Western Highway to make the road safe, following some gouging of the road surface during the crash.

RRV Western director Mal Kersting said crews would continue to assess whether any further rectification works were required on the Western Highway. RRV did not provide a timeframe for repair works.

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