South Australia has announced its plans to invest approximately A$402m for two grade separation projects.

The A$231m Torrens Road and A$171m Brighton Road grade separations will be jointly funded by the South Australian state and Australia’s federal governments.

South Australia Infrastructure Minister Stephan Knoll said the grade separations would remove two notorious crossings along Adelaide’s two busiest train lines.

Knoll added: “The Seaford and Gawler train lines are our most heavily patronised train lines and when the boom gates come down, it frustrates motorists on their way to work or home.

“In fact, we know that during peak periods at the Brighton Road level crossing, the boom gates are down for about 20% of the time, or about 25 minutes.”

The combined A$402m for two grade separations is in addition to A$305m committed by both the state and federal governments to upgrade the intersection.

With these funding commitments, both governments have agreed to release a total of A$707m for infrastructure to relieve congestion, which includes A$98m to upgrade the intersection of Magill Road and Portrush Road. This is alongside A$61m to upgrade the intersection of Cross Road and Fullarton Road, and A$60m to improve intersections of Goodwood/ Springbank/Daws Roads.

The overall funding also includes A$35m to upgrade the intersection of Glen Osmond Road and Fullarton Road, A$19m to revamp the intersection of Main North Road and Nottage Terrace. In addition, A$19m will be set aside to improve the intersection of Grand Junction/Hampstead/Briens Roads, and A$13m to upgrade the intersection of Main North, Kings and McIntyre Roads.

South Australia Premier Steven Marshall said the state government is building congestion busting infrastructure, cutting travel times for motorists and improving road safety.

Marshall said: “We are partnering with the federal government to deliver two grade separations and seven intersection upgrades in the upcoming state budget.

“Building this infrastructure will support the population growth we are striving for in South Australia.”