Malcolm Turnbull has returned to Adelaide with a pledge to fix well-known congestion trouble spots.
A re-elected coalition government would contribute $40 million to separate the rail line from the road at Oaklands Crossing.
This will help ease congestion at the site of 100 collisions between 2010 and 2015.
There is also a $2 million commitment to undertake planning for the upgrade of Marion Road.
The government says the investment will benefit people in the Liberal-held seats of Hindmarsh and Boothby.
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In the first, sitting MP Matt Williams is hoping to hold onto his job in the face of a challenge from Labor's Steve Georganas who lost in 2013.
And Nicole Flint aims to withstand the threat of the Nick Xenophon Team, as she tries to win Boothby - formerly held by retiring MP Andrew Southcott.
