Two Kings Park rangers who inspected a damaged bollard and oil trail near Corryn Rayney's undiscovered grave the day after she disappeared told the Supreme Court yesterday it appeared one car was driven down the track before reversing out the same way.
Park management officer Jason Rabbitt testified at Lloyd Rayney's wilful murder trial about the "odd" and "curious" discovery he made driving to work before 9am on August 8, 2007.
He said he noticed the broken bollard knocked over, a lump of concrete dislodged from the bollard's foundation and that everything was covered in oil.
The busted bollard and trail of car oil led police to Mrs Rayney's body buried nearby.
Prosecutors claim Mrs Rayney was murdered at her Como home on the night of August 7, 2007 and that her estranged husband buried her body upside down in the early hours of the next morning.
Mr Rabbitt, who said the bollard was not lying down when he drove past the Lovekin Drive track the previous evening, described to Justice Brian Martin seeing "distinctive tyre treads" that appeared to be from the same car but not a 4WD.
"It was one set of tyre tracks going up and back," he said. "You could tell it was the same tread."
He said there was no sign the car was turned around on the sandy track.
Mr Rabbitt, who went to the site three times that day and one time took photographs, said he did not walk up the track far enough to see where the tyre marks stopped.
The site, known as the Wattle Track, was used by joggers.
The ranger said Kings Park records showed there were showers on August 7, 2007 and over following days.
Mr Rabbitt said he noticed a pool of oil on the roadside that petered out to tiny drops further up the track, indicating the vehicle ran out.
"Everything was covered in oil, what looked like engine oil," he said.
He immediately reported the matter to his colleagues and told police, who were investigating the suicide of a man in Kings Park, about the damaged bollard three or four days later.
He reported the damage to acting environmental team leader Sarah Broomfield, who told the court it crossed her mind that the bollard could be connected to the suicide.
Ms Broomfield, who also took photographs when she walked down the track with two other workers in the afternoon of August 8, said the tyre impressions "very closely overlapped". She said this indicated one car went in and out the same way.
She also saw a "scratchy" area of sand along the track.
Ms Broomfield agreed with prosecutor John Agius that a pair of tyre marks went over the possible disturbance in the sand.
The court was told yesterday a government contractor vehicle driven by an undertaker damaged the bollard while being reversed out of the track on July 10, 2007.