Road. The rail crossing can be closed for up to 20 minutes in the peak hour. In August 2018, the possibility was raised that this section could be completed by tunnelling under the existing alignment. In 2020 the State Government was pursuing two options to complete this section. The first was an open motorway formed of at-grade, elevated and lowered portions, reminiscent of completed sections of the North–South Motorway, with short cut-and-cover tunnels where necessary. The second is a "hybrid option", with an open motorway between James Congdon Drive and Edward Street, Clarence Gardens, flanked by longer bored tunnels at the northern and southern ends. Geotechnical works to investigate both options started in August 2020. The 2020 state budget announced the preferred approach which would consist of two stages: Stage 1 would deliver a 4.3 km deep-bored tunnel and a 1 km lowered motorway from Darlington to Anzac Highway. Stage 2 would deliver a 2 km deep-bored tunnel from Sir Donald Bradman Drive to West Thebarton Road, with surface motorway and underpasses making up the remaining portions of Stage 2. The budget estimated the project cost at $8.9 billion. The full project reference design—finalising the approach from the 2020 stage budget—was released in November 2021. Stages 1 and 2 are expected to start construction in 2023 and 2026 respectively, with the full project planned for completion in 2030. Exits and interchanges See also References External links South Road Superway Project official webpage Freeways and highways in Adelaide