Both vehicles were extensively damaged and a seriously injured Paul, belted in the passenger seat of the station wagon, had to be cut free.
Paul chose not to give evidence, but a former partner of Bickley's told the court that when they were together, his driving was "erratic" and she would often close her eyes.
In his closing address, Paul's lawyer Bill Nabney told the jury that Bickley had a clear motive to come up with a cover story to try and shift the blame onto Paul.
"I suggest to you that Mr Bickley's version of events is nonsensical and, let's not sugar coat it, he's an unreliable witness and has a very good reason for not telling the truth.
"Mr Bickley knows he's in the gun if he is found to be responsible for causing this crash,"
Nabney said Bickley's evidence had been contradicted by several Crown witnesses.
"I invite you to come back with not guilty pleas on all charges, he said.
Crown prosecutor Heidi Wrigley argued that while Bickley contradicted himself a few times he gave "an accurate and honest account" during the core pieces of evidence.
Wrigley said Bickley's account was also supported by the Crown witnesses.
Bickley's account was also consistent with Senior Constable Chelley's evidence, she said.
The trial continues today.
