The federal government will provide more than $400 million to help fund infrastructure projects in South Australia in a major boost for the new Liberal state government's first budget.
Tuesday's financial blueprint will include funds for road and rail projects with the commonwealth cash flowing because of the state government's improved relationship with Canberra, Premier Steven Marshall says.
"We're now seeing that constructive working relationship pay significant dividends for South Australia," Mr Marshall said on Sunday.
"We've been able to accelerate the delivery of this funding to deliver these projects more rapidly.
"These key infrastructure projects will support our construction industry, creating more jobs and providing certainty into the future."
The federal government has agreed to provide $177 million to upgrade another section of Adelaide's South Road corridor, $220 million to electrify the Adelaide to Gawler rail line and $160 million for a new bridge project at Port Augusta in the mid-north.
Last week it also committed $70 million for a road duplication project at Port Wakefield.
Transport and Infrastructure Minister Stephan Knoll said the state government would continue to build on SA's infrastructure project pipeline.
"These projects will help grow South Australia's economy, create more jobs and benefit road and public transport commuters," Mr Knoll said.
"The Gawler line electrification project will deliver a better, more reliable and efficient service."
But the budget funding commitments came as the Labor opposition accused the state government of spending too much on luxuries such as "boozy" lunches and chauffeured limousines, leaving no excuses for any cuts in Tuesday's budget.
Opposition treasury spokesman Stephen Mullighan said before the March state election, Mr Marshall promised his ministers would lead by example and not waste taxpayers' money.
"Less than six months later, it's clear the Liberals are spending like drunken sailors," Mr Mullighan said.
Labor said the government's extravagant purchases included $5409 by one minister for three top-of-the-range mobile phones for him and two of his staff, $2679 for high-end video and camera equipment for the premier's office and more than $1200 for a "boozy" lunch for premier's office staff.
