A driver who allegedly fled a crash site where four police officers were killed is due to face a Melbourne court charged with a raft of offences.
The 41-year-old Fitzroy man is expected to appear in the Melbourne Magistrates Court on Friday to face 10 charges, including speeding, reckless conduct and drug possession.
Leading Senior Constable Lynette Taylor, Senior Constable Kevin King and Constables Glen Humphris and Josh Prestney lost their lives on Wednesday evening as they were dealing with the Porsche driver on the Eastern Freeway in Kew.
A refrigerated truck veered to the left and hit them at 100km/h as they stood in the emergency lane.
The unharmed Porsche driver was arrested on Thursday morning.
He was charged with driving at a dangerous speed, reckless conduct endangering life, failing to remain after a drug test, failing to render his assistance, failing to exchange his details, possessing a drug of dependence, destruction of evidence and three counts of committing indictable offence while on bail.
The truck driver had a medical episode and is in hospital under police guard, and was still not fit to be questioned.
Police raided the truck driver's Cranbourne home on Wednesday night and are yet to reveal what they found.

The Flinders Street Station is lit up in blue colour in tribute to four police officers that died after being hit by a truck on Melbourne's Eastern Freeway. Source: AAP
Flood of tributes for officers
Sen Const Taylor, 60, had been with the force for 31 years and joined the road policing drug and alcohol section in 2011, while both Constables Humphris and Prestney had only recently graduated from the academy.
Survived by her husband and two sons, Sen Const Taylor had also recently been the primary carer for her sister after she experienced a stroke, with her "caring nature" also extending to her colleagues.
Even at 50, Sen Const King was relatively new to the force, joining six years ago and working at several Melbourne stations before transferring to the Nunawading Highway Patrol in 2018.
After working as an apprentice carpenter and personal trainer, Const Humphris joined the force after moving to Melbourne from Newcastle, while Const Prestney, 28, graduated from the academy in December, with his brother - a fellow officer - presenting him with his badge.
The Victoria Police In Memorium Facebook page was flooded with posts on Thursday evening paying respects to the officers, including from past and current police.
Flags were also flying at half-mast and landmarks lit up in blue across Victoria on Thursday in honour of the officers.