SA to spend on infrastructure in budget

The South Australian government is set to commit to a range of transport infrastructure projects in the state budget although it may tip it into the red.

The SA government will outline funding promises on rail and public transport in the state budget. (AAP)

Infrastructure spending will be a key part of the South Australian budget this week with the state government already revealing commitments to a range of projects.

Tuesday's budget will outline funding promises for road and rail and public transport initiatives including further work on Adelaide's South Road corridor and the electrification of the Adelaide to Gawler train line.

The budget will also outline the almost $500 million of assistance to come from the federal government.

The commonwealth 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.

The state government says the spending will fulfill election promises but they are also expected to tip the budget into the red unless it looks for cuts in other areas.

Labor says there no excuses for any cuts with the government splurging on luxuries since taking office, including "boozy" lunches and chauffeured limousines.