If elected on March 15, a Liberal government will double black spot funding to make South Australian roads safer and free up congestion.
The funding increase will take the total state and federal capital expenditure on black spots in South Australia to $17 million per year.
"Under the Weatherill Labor government projects are missing out on black spot funding every year because there is not enough funding available," Mr Marshall said.
"Our plan is to double state black spot funding to make our roads safer and cut travel times in many areas.
"We will build on the funding provided by the federal government every year to make our roads safer and also the hard work that local councils do to identify solutions to dangerous roads."
Upon her recent visit to Whyalla, Shadow Minister for Transport and Infrastructure Vickie Chapman said the plan to double black spot funding would help lower the number of crashes and delays across South Australia.
"This is a critical reform, its good news of course for the people in the country particularly because we have identified, and councils nominate areas of which there are major and repeated incidents on our roadways," Ms Chapman said.
Ms Chapman said unfortunately a lot of the innovation for safety measures is based on incidents and fatalities but the black spot program looks broader.
"It means dealing with turning right lanes, overtaking lanes, those types of things where we can actually improve the safety of the road immediately for a small amount of money," Ms Chapman said.
"We need to make our roads safer and speed up the transport network.
"Unsafe roads can lead to congestion through people waiting for breaks in traffic to turn, and also delays when accidents occur.
"We understand it's important that we have safe roads that we actually are able to move on at a reasonable speed."
Ms Chapman said doubling this funding will address a $30 million backlog of black spot funding applications and allow the government to double the number of projects straight away.
"A Marshall Liberal Government will deliver the road upgrades that have been overlooked through 12 years of Mr Weatherill and Labor," Ms Chapman said.