A stretch of road, regularly listed among SA's worsts roads, has received a $40 million funding boost for upgrades, from the federal government.
The Horrocks Highway will receive the assistance on the $105m project, with the SA and federal governments sharing in the contributions in a 20:80 split.
The additional funding will widen and strengthen bridges at Wakefield River, Hutt River and Rocky River, upgrade local road junctions, deliver shoulder sealing and curve widening, install safety barriers and Audio Tactile Line Marking, and provide overtaking lane extensions at Tarlee and Templers.
This builds on the package of works already under way on the corridor, including installing new overtaking lanes and shoulder sealing along priority sections between Clare and Auburn and south of Giles Corner, improvements to the Gladstone level crossing, and the replacement of a bridge and a culvert north of Melrose.
Deputy Prime Minister and Infrastructure, Transport and Regional Development Minister Barnaby Joyce said the Australian government was committed to delivering the infrastructure South Australians need and deserve to get around safely and smoothly.
"This package of works along the Horrocks Highway will greatly bolster safety, community connections and freight efficiency along this key route," he said.
"Not only will this have a profound impact for communities and businesses well into the future, it will also support 135 jobs during construction to provide a much-needed short-term economic boost.
Finance Minister and Senator for SA Simon Birmingham said the project would improve safety and ride quality for motorists while increasing accessibility for local freight networks.
"The Horrocks Highway is a vital rural route in SA, and is a major gateway connecting primary producers and tourists alike from the Clare Valley to the Mid North of our state," he said.
"Upgrading this key route will also improve access for our primary producers and local businesses to domestic and international markets, ensuring their local produce can get to where it needs to."
SA Infrastructure and Transport Minister Corey Wingard said regional roads were critically important but they were ignored for years.
"This additional funding for works on the Horrocks Highway is another major win for motorists in the Mid North and Clare Valley and is part of our plan to build a stronger future for our state," he said.
"Thanks to the Marshall Liberal government's strong partnership with the federal government, more than $2.8 billion has been invested in our country roads - a record amount that's improving safety and productivity."
Federal Member for Grey Rowan Ramsey said securing this additional funding was a big win for the thousands of local residents and businesses who relied on this key route.
"The works promised before the last election started at Wilmington at the northern end of the highway and worked their way down now, to south of Auburn and the improvement is dramatic," he said.
"This latest investment will push the works further south improving the "Horrocks" for all, but particularly making it friendlier for the wine/tourism trade coming up from Adelaide.
"The state of our roads, overtime, has probably been the most consistent issue people have raised with me and that it is why it is so satisfying to be able to say that government investment in the network is at unprecedented levels.
"We are repairing the highways and the byways of the nation and the importance of that cannot be underestimated for local residents, farmers and tourism operators."
"Currently more than $1 billion is either committed, under way or completed for roadworks in Grey and this is of course increased by the state 20 per cent partnership. It's extraordinary!
"From one end of Grey to the other works are underway, including on the Horrocks Highway."
Since 2013-14, the Australian government has committed more than $12.9b towards infrastructure projects in SA.
This includes $160 million toward the Joy Baluch AM Bridge duplication and $96
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