An accused drug-driver allegedly told one of four police officers killed in a Melbourne freeway crash "amazing, absolutely amazing" as she groaned for help.

Richard Pusey, 41, was pulled over for allegedly speeding at 140km/h and police say he tested positive to ice and cannabis on the Eastern Freeway on Wednesday.

He was urinating on the side of the freeway when a truck driver smashed into four officers impounding his Porsche 911.

READ MORE: Four police officers killed in horror freeway crashed named

Richard Pusey, the driver of a Porsche who allegedly fled the scene of a truck crash on Melbourne's Eastern Freeway which killed four police officers. (AAP)

One of them, Leading Senior Constable Lynette Taylor, could be heard calling for help before Mr Pusey began filming the crash.

He allegedly walked up to her and said: "There you go. Amazing, absolutely amazing".

"All I wanted was to go home and have my sushi and now you've f----- my f------ car," Mr Pusey allegedly said as Senior Constable Lynette Taylor continued to groan for help, the Melbourne Magistrates Court was told today.

From left: Police officers Kevin King, Joshua Prestney, Lynette Taylor and Glen Humphris were all killed in the line of duty. (Victoria Police)

The officer and three of her colleagues, Senior Constable Kevin King and Constables Glen Humphris and Josh Prestney, died at the scene, with Mr Pusey allegedly running away.

He is accused of asking a witness for a ride to his home suburb of Fitzroy before being arrested yesterday about 9.30am after handing himself in to West Melbourne Police Station.

In a summary read in court, homicide detectives alleged Mr Pusey ran back to his Porsche, got his iPhone out, and did a lap of the scene filming as Constable Taylor pleaded for help while dying.

Pusey has faced court in Melbourne. (AAP)

Mr Pusey then called his wife in the car and visited his Smith Street doctor. The accused also called an Australian Federal Police (AFP) officer known to him. He allegedly sent the officer the videos and photos that he captured at the scene, before going to sleep.

Mr Pusey's wife also attended court today.

Mr Pusey did not apply for bail when he appeared in Melbourne Magistrates Court charged with offences including dangerous driving, reckless conduct endangering life, failing to render assistance, drug possession and the destruction of evidence.

Police Association Victoria secretary Wayne Gatt described the alleged act as "soulless".

"I think four police heroes died, and one coward lived. I think he will be able to live with himself because they're soulless."

Truck driver remains in hospital

Truck driver Mohinder Singh Bajwa is in the Royal Melbourne Hospital under police guard, where he is likely to remain for a number of days.

Mr Bajwa suffered a medical episode immediately after the crash and blacked out. He is yet to be interviewed by police due to his condition.

It is not yet known why Mr Bajwa allegedly veered into the freeway emergency lane.

Truck driver Mohinder Singh Bajwa. (Facebook)

A crushed police car leaves the crash site. (AAP)

"The truck itself appears to have moved from one of the traffic lanes in the freeway into the emergency lane and has travelled a short distance in the emergency lane at around about 100km/h and has then slammed into the rear of the Highway Patrol vehicle," Victoria Police Chief Commissioner Graham Ashton previously said.

How the deadly Melbourne crash unfolded

Wednesday, 4.50pm: Mr Pusey, the driver of a black Porsche 911, was stopped by police on the Eastern Freeway, between the Chandler Highway and Burke Road exits at Kew, for speeding after officers allegedly clocked the vehicle doing more than 140km/h. He tested positive to ice and cannabis and the attending officers called for backup. Two additional police officers from Highway Patrol attended the scene.

A timeline of how the Melbourne freeway tragedy unfolded. (Nine)

5.40pm: All four police officers were outside of their vehicles talking with the driver of the Porsche when they were hit from behind by a large refrigeration semi-trailer truck. One female officer and three male officers were killed on impact. Mr Pusey allegedly took graphic photos of the scene and fled shortly after on foot.

Later that evening: Police swarmed the scene and remained at the crash site investigating. The truck driver was taken to hospital. Officers also raided the truck driver's Cranbourne home in Melbourne's outer-east. Victorian state coroner, Judge John Cain and coroner Darren Bracken attended the collision site to commence a coronial investigation.