Lorraine Nicholson, 64, was driving a Jeep when it T-boned a Kia driven by Elaine Middleton and carrying passengers Margaret Ely, Dianne Barr and Claudia Jackson, aged 64 to 75, at Stawell-Avoca Road and Ararat-St Arnaud Road at 6pm on May 5, 2018.

The four women, who were returning to the Western District after attending a line-dancing competition in St Arnaud, died from their injuries at the scene.

Detective Sergeant Darren Williams, of the Major Collision Investigation Unit, attended the crash scene later that night.

He told the jury at the County Court in Ballarat on Wednesday the crash occurred at sunset and the road conditions were dry.

Detective Sergeant Williams, who is the police informant, provided maps of the intersection to the jury which showed its signage at the time of the fatality and as recent as Monday.

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He said a number of signs had been erected since the crash, including an advisory sign before the stop sign.

The police informant said the stop sign had been increased in size, while rumble strips before the intersection had since been installed.

He said at the time of the crash, a sign was installed incorrectly indicating right of way for vehicles before two stops signs.

The jury were played GoPro video footage of a police vehicle driving along the road and through the intersection as Nicholson did on the day of the crash.

She was visibly shaking in the dock during the footage.

The jury will be taken to the intersection on Thursday which will help them "better understand it", Judge Michael Bourke said.

They were provided with 31 photos taken at the crash scene on the day of the crash and of the following day.

A further nine photos taken on Monday were given to the jury.

Nicholson has pleaded not guilty to four charges of culpable driving causing death, and the alternative four charges of dangerous driving causing death.

The trial will continue on Thursday in front of Judge Michael Bourke.