Drugs and an ice pipe were allegedly found inside the cabin of a truck involved in a fatal crash on a Melbourne freeway, police have revealed.

Police commissioner Graham Ashton has revealed Mohinder Singh Bajwa is facing questioning by homicide detectives.

He has been at the Royal Melbourne Hospital since the accident on Wednesday night which left four police officers dead.

Bajwa’s truck reportedly came off the Eastern Freeway while travelling at 100kph, colliding with the officers who had pulled over a Porsche in the emergency lane.

Leading Senior Constable Lynette Taylor, Senior Constable Kevin King and Constables Glen Humphris and Josh Prestney died at the scene.

Mohinder Singh Bajwa has been identified as the driver of the truck involved in a crash which claimed the lives of four police officers. Credit: Facebook/AAP

Investigators allegedly found cannabis, methylamphetamine and an ice pipe inside the truck’s cabin after the accident.

Bajwa is expected to be questioned by police in the coming days.

Porsche driver in court

In court on Friday, harrowing allegations emerged about the Porsche driver who was pulled over before the fatal accident.

The court heard the accused drug-driver allegedly told a police officer “Amazing, absolutely amazing” as she lay dying.

A police car is removed from the crash scene at Melbourne’s Eastern Freeway near Kew. Credit: SCOTT BARBOUR / AAPIMAGE

Fitzroy man Richard Pusey, 41, appeared in Melbourne Magistrates Court facing 10 charges, including speeding, reckless conduct and drug possession.

The court was told Pusey had filmed Senior Constable Taylor as she called out for help, with police alleging he said “all he wanted to do was go home”.

Richard Pusey, the driver of a Porsche who allegedly fled the scene of a truck crash on Melbourne's Eastern Freeway. Credit: MICHAEL DODGE / AAPIMAGE

“Amazing. Absolutely amazing. All I wanted to do was go home and eat my sushi and now you have f***ed my f***ing car,” police allege Pusey said to Sen Const Taylor.

There is no evidence Pusey himself posted photos of the crash to Facebook, police told the court.

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The mortgage broker is said to have called his wife and told her what he had seen while being given a lift to Fitzroy, and also spoke to his doctor about it.

Pusey did not apply for bail on Friday.