Waste collection has been disrupted across much of the nation after Transpacific grounded its fleet of trucks following a fatal crash in Adelaide.

The grounding of 2800 Transpacific trucks after a fatal crash in Adelaide has disrupted waste collection across the nation.

Household garbage collection is currently disrupted in parts of Sydney, Adelaide, Brisbane, Darwin, Geelong and Perth, the Transport Workers Union (TWU) said on Wednesday.

Transpacific, the nation’s biggest waste management company, announced on Tuesday it had grounded its entire national fleet while a third party inspects its trucks and maintenance records.

It comes after a Transpacific truck slammed into three stationary cars at a major Adelaide intersection on Monday, killing a 41-year-old Ingle Farm woman and a 56-year-old Hallett Cove man.

The 28-year-old male truck driver, from Netley, and a 48-year-old woman, from Hahndorf, are both in a critical condition in hospital.

Police are investigating whether brake failure caused the crash at the “high risk location”.

A Transpacific spokeswoman told AAP the company was working to ensure its trucks were back on the road as quickly as possible but there was no firm timeline for their resumption.

She said the company would prioritise bringing municipal waste trucks back in service.

Transpacific had provided police with access to its trucks and maintenance records and the driver had undergone thorough safety training, the spokeswoman said.

TWU national secretary Tony Sheldon said he expected trucks to remain off the roads for a week.

He said low operating margins were forcing trucking companies to cut corners.

“This is another example of the pressures that are in the trucking industry – in this case, right across the country from various local governments,” he told reporters in Sydney.

Mr Sheldon said the Road Safety Remuneration Tribunal was one of the few mechanisms available to help enforce safe working conditions for drivers.

The union fears the government is looking to wind down the independent body.

“Clients are running wild and the federal government wants them to run wilder,” Mr Sheldon said.

Police have said it appeared the driver of the sewage truck was travelling at considerable speed before the crash.

“Unfortunately this is one of those locations on South Australian roads where we see these incidents far too often,” Superintendent Bob Fauser said.