Melbourne Eastern Freeway tragedy: Killer driver Mohinder Singh key witness in case against trucking manager Simiona Tuteru

A trucking manager is set to fight allegations of manslaughter in relation to the Melbourne Eastern Freeway tragedy. Photo / Getty Images

The driver who ploughed into four police officers and killed them on Melbourne's Eastern Freeway will testify against his manager who faces manslaughter charges over the horror crash.

Simiona Tuteru is facing 82 charges including four counts of manslaughter in relation to the crash which left Senior Constables Lynette Taylor, Kevin King and Constables Glen Humphris and Joshua Prestney dead.

The 49-year-old trucking manager appeared in the Melbourne Magistrates Court today to fight the charges at a committal hearing.

The officers were killed after they stopped to pull over Richard Pusey, who was clocked speeding at 149km/h in his black Porsche. He was urinating on the side of the road at the time of the crash and avoided being hit.

Killer driver Mohinder Singh was jailed for 22 years in April after pleading guilty to four counts of culpable driving causing death.

The trucking manager's lawyer, David Hallowes SC, told the court prosecutors planned to rely on him as a witness in the case.

The driver's "credibility and reliability" would be an issue and Hallowes wanted to cross-examine him in relation to his claims.

Singh's wife and two children are also expected to give evidence at the hearing today but it's unclear when the driver will testify.

Prosecutors requested family members give their evidence via videolink so they didn't have to run the "media gauntlet" at the court but technical difficulties meant they would be forced to appear in person.

The hearing in front of Magistrate Luisa Bazzani will continue this afternoon.