The South Australian opposition has pledged to develop a plan for Adelaide's long-awaited north-south road corridor if it wins the March state election.
Liberal leader Steven Marshall says a plan to develop the entire corridor, which has drawn support from the federal government, would end the disjointed approach taken in recent years.
He says it would result in free-flowing traffic, improved commuter safety and reduced congestion.
"A master plan for the entire north-south is a sensible solution," Mr Marshall said after an address to the South Australian Liberal Party annual meeting on Saturday.
"For years the state Labor government has had a disjointed approach to transport and infrastructure that has failed to deliver outcomes for South Australians."
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Prime Minister Tony Abbott also told Saturday's meeting that the federal government would help fund the project.
Before the recent federal election the coalition pledged $500 million to help fund an upgrade to a section of the corridor at suburban Darlington.
On Saturday Mr Abbott also indicated federal support for upgrading the Torrens Road section of the corridor and to developing the entire corridor within 10 years.
Mr Marshall said developing the master plan would be a first order of business for a Liberal SA government with a view to having the entire project completed as soon as possible.
The idea of a north-south road corridor across Adelaide was first suggested back in the 1960s.
