The Labor government has committed to upgrade on two roads to improve safety.
A new southbound overtaking lane will be constructed on Long Valley Road to improve safety on the Adelaide Hills connector road.
The lane, approximately 1.5 kilometres north of Long Valley Cootages Road, to near Mine Flat Road, is part of the $150 million Adelaide Hills Productivity and Road Safety Package, which is jointly funded (80:20) by the Australian and South Australian governments.
It will be the second overtaking lane to be constructed on Long Valley Road, with works set commence later this year.
Early works on the other new southbound overtaking lane - from the railway line to Gemmell Road - were completed in May, with main construction works set to start in the coming months.
The works also include junction upgrades at the Long Valley Road junctions with Stirling Hill Road and Gemmell Road.
Regional Roads Minister Geoff Brock said Long Valley Road was a key transport route connecting Strathalbyn to Mount Barker and the South Eastern Freeway.
"The construction of two new southbound overtaking lanes will improve road safety on this key connector road by providing and encouraging safe overtaking opportunities and reducing driver frustration from drivers not being able to overtake slower moving vehicles," he said.
Works are also accelerating on the Victor Harbor duplication.
The $685m upgrade, also funded jointly by the Australian and South Australian governments, is expected to support 945 jobs per year during construction.
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Construction of the new lanes of Victor Harbor Road (between Main South Road and McLaren Vale) began after the installation of temporary traffic barriers in May.
The new carriageway is being constructed alongside the existing road, behind the barriers.
Once completed, the project - which also includes duplication of Main South Road from Seaford to Sellicks Beach, grade separation and road alignment at Aldinga Beach Road and Aldinga Road, plus new overtaking lanes between Myponga and Cape Jervis - will reduce congestion and traffic bottlenecks while increasing safety for drivers heading to key locations on the Fleurieu Peninsula.
Transport Minister Tom Koutsantonis said it was fantastic to see major works progressing on this very important project, improving access to one of the most popular parts of the state.
"Once complete, this project will bring benefits to the many thousands of South Australians who work and live in the region, while also boosting economic growth through better access for visitors and tourists," he said.
"It will reduce congestion and traffic bottlenecks while increasing safety for drivers heading to key locations on the Fleurieu Peninsula, including some of our iconic tourist destinations."